Download Service Instructions

Service
Instructions
Models listed
on pages 4-6
80% GDT, GMP, GMPE, GMPH,
GMPV, GMT, GMTH, GPD
90% GMNT, GMNTE, GMNV, GMPN, GSM,
GSMS, GSU
This Forced Air Central Unit Design Complies With
Requirements Embodied in The American National
Standard / National Standard of Canada Shown Below.
ANSI Z21.47•CSA-2.3 Central Furnaces
®
This manual is to be used by qualified, professionally trained HVAC technicians only.
Goodman does not assume any responsibility for property damage or personal injury
due to improper service procedures or services performed by an unqualified person.
Copyright © 2000-2007 Goodman Manufacturing Company, L.P.
RS6610003
January 2007
TABLE OF CONTENTS
IMPORTANT INFORMATION ........................... 2-3
SERVICING .................................................. 30-56
PRODUCT INFORMATION ........................... 4-12
SERVICING TABLE OF CONTENTS ................ 32
SPECIFICATIONS ....................................... 13-23
TROUBLESHOOTING ....................................... 46
DIMENSIONS ............................................... 24-27
WIRING DIAGRAMS .................................... 58-77
MAINTENANCE .................................................. 28
IMPORTANT INFORMATION
Pride and workmanship go into every product to provide our customers with quality products. It is possible, however,
that during its lifetime a product may require service. Products should be serviced only by a qualified service
technician who is familiar with the safety procedures required in the repair and who is equipped with the proper tools,
parts, testing instruments and the appropriate service manual. REVIEW ALL SERVICE INFORMATION IN THE
APPROPRIATE SERVICE MANUAL BEFORE BEGINNING REPAIRS.
IMPORTANT NOTICES FOR CONSUMERS AND SERVICERS
RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS
WARNING
THIS UNIT SHOULD NOT BE CONNECTED TO, OR USED IN CONJUNCTION WITH, ANY DEVICES THAT ARE NOT DESIGN CERTIFIED FOR USE WITH THIS UNIT OR HAVE NOT BEEN
SERIOUS PROPERTY DAMAGE OR PERSONAL INJURY, REDUCED UNIT PERFORMANCE AND/OR HAZARDOUS CONDITIONS MAY RESULT
FROM THE USE OF DEVICES THAT HAVE NOT BEEN APPROVED OR CERTIFED BY GOODMAN.
TESTED AND APPROVED BY GOODMAN.
WARNING
TO PREVENT THE RISK OF PROPERTY DAMAGE, PERSONAL INJURY, OR DEATH,
DO NOT STORE COMBUSTIBLE MATERIALS OR USE GASOLINE OR OTHER
FLAMMABLE LIQUIDS OR VAPORS IN THE VICINITY OF THIS APPLIANCE.
W ARNING
G OODMAN W ILL NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY DAM AGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES.
I F YOU INSTALL OR PERFORM SERVICE ON THIS UNIT, YOU ASSUME RESPONSIBILITY FOR ANY PERSONAL INJURY OR PROPERTY DAMAGE WHICH
MAY RESULT. M ANY JURISDICTIONS REQUIRE A LICENSE TO INSTALL OR SERVICE HEATING AND AIR CONDITIONING EQUIPMENT.
W ARNING
HIGH VOLTAGE
D ISCONNECT ALL POWER
BEFORE SERVICING OR INSTALLING THIS UNIT.
TO DO SO MAY CAUSE PROPERTY DAM AGE, PERSONAL INJURY OR DEATH.
2
M ULTIPLE
POWER SOURCES MAY BE PRESENT.
F AILURE
IMPORTANT INFORMATION
WARNING
IF THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED
EXACTLY, A
FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL
INJURY OR LOSS OF LIFE.
–
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.
–
WHAT TO DO IF YOU SMELL GAS:
• DO NOT TRY TO LIGHT ANY APPLIANCE.
• DO NOT TOUCH ANY ELECTRICAL SWITCH; DO NOT USE ANY
PHONE IN YOUR BUILDING.
• IMMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR’S
PHONE.
FOLLOW THE GAS SUPPLIER’S INSTRUCTIONS.
• IF YOU CANNOT REACH YOUR GAS SUPPLIER, CALL THE FIRE
CARBON MONOXIDE POISONING HAZARD
Special Warning for Installation of Furnace or Air Handling Units in
Enclosed Areas such as Garages, Utility Rooms or Parking Areas
DEPARTMENT.
– INSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED INSTALLER,
SERVICE AGENCY OR THE GAS SUPPLIER.
WARNING
SHOULD OVERHEATING OCCUR OR
THE GAS SUPPLY FAIL TO SHUT OFF, TURN
Carbon monoxide producing devices (such as an automobile, space
heater, gas water heater, etc.) should not be operated in enclosed areas
such as unventilated garages, utility rooms or parking areas because of
the danger of carbon monoxide (CO) poisoning resulting from the exhaust
emissions. If a furnace or air handler is installed in an enclosed area such
as a garage, utility room or parking area and a carbon monoxide producing
device is operated therein, there must be adequate, direct outside
ventilation.
OFF THE MANUAL GAS SHUTOFF VALVE EXTERNAL TO THE FURNACE BEFORE
TURNING OFF THE ELECTRICAL SUPPLY.
This ventilation is necessary to avoid the danger of CO poisoning which
can occur if a carbon monoxide producing device continues to operate in
the enclosed area. Carbon monoxide emissions can be (re)circulated
throughout the structure if the furnace or air handler is operating in any
mode.
CO can cause serious illness including permanent brain damage or death.
B10259-216
To locate an authorized servicer, please consult your telephone book or the dealer from whom you purchased this
product. For further assistance, please contact:
CONSUMER INFORMATION LINE
GOODMAN® BRAND PRODUCTS
TOLL FREE 1-877-254-4729 (U.S. only)
email us at: [email protected]
fax us at: (731) 856-1821
(Not a technical assistance line for dealers.)
Outside the U.S., call 1-713-861-2500.
(Not a technical assistance line for dealers.) Your telephone company will bill you for the call.
3
PRODUCT IDENTIFICATION
NOMENCLATURE
G
M
T
070
3
*
BRAND
G: Goodman Gas Furnace
AIR FLOW DIRECTION
Engineering
Revision
M: Multi-Position
D: Dedicated Downflow
P: 80% Single Stage
S: 92% Single Stage
MAXIMUM CFM
@ 0.5" ESP
DESCRIPTION
T:
P:
D:
M:
3: 1,200
4: 1,600
5: 2,000
80% Tubular Heat Exchanger
80% Non-Tubular Heat Exchanger
Downflow Position
Multi-Position (Upflow/Horizontal)
KBTUH
045: 45,000
050: 50,000
060: 60,000
070: 70,000
075: 75,000
090: 90,000
100: 100,000
115: 115,000
125: 125,000
140: 140,000
GDT045-3
GDT045-3A
GDT045-3B
GDT070-3
GDT070-3A
GDT070-3B
GDT090-4
GDT090-4A
GDT090-4B
GDT115-5
GDT115-5A
GDT115-5B
4
GMP050-3
GMP050-32
GMP050-32C
GMP075-3
GMP075-32
GMP075-32C
GMP075-4
GMP100-3
GMP100-4
GMP100-42
GMP100-42C
GMP100-5
GMP125-4
GMP125-5
GMP125-52
GMP125-52C
GMP150-5
GMP150-52
GMP150-52C
GMT045-3
GMT045-34
GMT045-3A
GMT045-3B
GMT070-3
GMT070-3A
GMT070-3B
GMT070-4
GMT070-4A
GMT070-4B
GMT090-3
GMT090-3A
GMT090-3B
GMT090-4
GMT090-4A
GMT090-4B
GMT090-5
GMT090-5A
GMT090-5B
GMT115-5
GMT115-5A
GMT115-5A
GMT115-5B
GMT135-5
GMT140-5
GMT140-5A
GMT140-5B
GMT140-5D
GPD050-3
GPD100-4
GPD125-4
GSM060-3
GSM080-4
GSM100-4
GSMS060-3
GSMS080-4
GSMS100-4
PRODUCT IDENTIFICATION
NOMENCLATURE
G
M
P
V
070
3
*
BRAND
G: Goodman Gas Furnace
AIR FLOW DIRECTION
Engineering
Revision
M: Multi-Position
D: Dedicated Downflow
MAXIMUM CFM
@ 0.5" ESP
DESCRIPTION
3: 1,200
4: 1,600
5: 2,000
T: 80% Tubular Heat Exchanger
P: 80% Non-Tubular Heat Exchanger
BLOWER TYPE
KBTUH
V: Variable Speed - Single Stage
E: Variable Speed - Two Stage
H: High Air Flow
045: 45,000
070: 70,000
075: 75,000
090: 90,000
100: 100,000
115: 115,000
125: 125,000
140: 140,000
GMPV075-1.5
GMPV075-3
GMPV100-3
GMPV100-5
GMPV125-3
GMPV125-5
GMPE075-3
GMPE075-3A
GMPE100-4
GMPE100-4A
GMPE125-5
GMPE125-5A
GMTH045-3
GMTH045-3A
GMTH045-3B
GMTH070-4
GMTH070-4A
GMTH070-4B
GMTH090-5
GMTH090-5B
GMTH115-5
GMPH050-3
GMPH075-4
GMPH080-5
GMPH120-5
5
PRODUCT IDENTIFICATION
NOMENCLATURE
M
G
P
N
070
3
*
BRAND
G: Goodman Gas Furnace
AIR FLOW DIRECTION
Engineering
Revision
M: Multi-Position
D: Dedicated Downflow
S: 90+ Condensing Furnace
MAXIMUM CFM
@ 0.5" ESP
DESCRIPTION
3: 1,200
4: 1,600
5: 2,000
M: Upflow/Horizontal
P: Position
N: 92.6% Condensing
BLOWER TYPE
KBTUH
N: 90% Condensing Furnace
S: Single Stage Operation
T: Single Stage - Tubular Heat Exchanger
TE: Two-stage/Variable Speed - Tubular Heat Exchanger
040: 40,000
060: 60,000
080: 80,000
100: 100,000
120: 120,000
GMNT040-3
GMNT040-3B
GMNT045-3B
GMNT060-3
GMNT060-3B
GMNT080-4
GMNT080-4B
GMNT090-5A
GMNT100-4
GMNT100-4B
GMNT120-5
GMNT120-5B
GMNT120-5D
6
GMNTE060-3
GMNTE080-4
GMNTE100-4
GMNTE120-5
GMPN040-3
GMPN060-3
GMPN080-4
GMPN100-4
GMPN120-5
GSMS060-3
GSMS080-4
GSMS100-4
PRODUCT IDENTIFICATION
Model #
Description
GDT
80% AFUE. Downflow application, single stage, induced draft motor,
psc multi-speed motor, integrated control module with diagnostics,
hot surface ignition system, multiple roll out switches, pressure
switches, aluminized tubular steel heat exchanger, aluminized inshot
burners.
GMT
80% AFUE. Multi-position (Upflow, Horizontal Left or Right), single
stage, induced draft motor, psc multi-speed motor, integrated control
module with diagnostics, hot surface ignition system, roll out
switches, pressure switches, aluminized tubular steel heat
exchanger and inshot burners.
GMTH
80% AFUE. Multi-position (Upflow, Horizontal Left or Right), single
stage, multi-position induced draft motor, psc multi-speed motor,
integrated control module with diagnostics, hot surface ignition
system, multiple roll out switches, pressure switches, a rotating
combustion blower motor that allows venting the furnace through the
top panel, right hand side panel and left hand side panel, aluminized
steel heat exchanger and inshot burners.
GMP
80% AFUE. Multi-position (Upflow, Downflow, Horizontal Left or
Right), single stage, induced draft motor, psc multi-speed motor,
integrated control module with diagnostics, hot surface ignition
system, multiple roll out switches, pressure switches, aluminized
steel heat exchanger, aluminized inshot burners, LoNox.
GMPE
80% AFUE. Multi-position (Upflow, Downflow, Horizontal Left or
Right), two-stage gas valve, multi-position induced draft motor,
variable-speed ECM motor, integrated control module with
diagnostics, hot surface ignition system, multiple roll out switches,
outlet air limit switch and LoNox approved.
GMPH
80% AFUE. Multi-position (Upflow, Downflow, Horizontal Left or
Right), single stage, induced draft motor, psc multi-speed motor,
integrated control module with diagnostics, hot surface ignition
system, multiple roll out switches, pressure switches, aluminized
steel heat exchanger and inshot burners.
GMPV
80% AFUE. Multi-position (Upflow, Downflow, Horizontal Left or
Right), single stage, induced draft motor, variable speed ECM motor,
integrated control module with diagnostics, hot surface ignition
system, multiple roll out switches, pressure switches, aluminized
steel heat exchanger, aluminized inshot burners.
GPD
80% AFUE. Downflow application. Single stage, induced draft motor,
psc multi-speed motor, integrated control module with diagnostics,
hot surface ignition system, multiple roll out switches, pressure
switches, aluminized steel heat exchanger, aluminized inshot
burners, LoNox, gas and electric connections can be made on the
left or right side.
7
PRODUCT IDENTIFICATION
Model #
GMNV
90% AFUE. Multi-position (Upflow or Horizontal), single stage,
induced draft motor, variable speed motor, hot surface ignition
system, roll out switch, pressure switch, aluminized steel heat
exchanger and aluminized inshot burners.
GMNT
92.6% AFUE. Multi-position (Upflow, Horizontal Left or Right),
induced draft, psc multi-speed motor, integrated control module with
diagnostics, hot surface ignition system, multiple roll out switches,
pressure switches, multi-position induced draft motor, tubular heat
exchanger (primary) and aluminized inshot burners.
GMNTE
92.6% AFUE. Multi-position (Upflow, Horizontal Left or Right), twostage gas valve, two-stage induced draft motor, variable speed
blower motor, integrated control module with diagnostics, hot surface
ignition system, roll out switches, pressure switches, tubular heat
exchanger (primary) and aluminized inshot burners, LoNOx.
GMPN
92.6% AFUE. Multi-position (Upflow, Downflow, Horizontal), single
stage, induced draft motor, psc multi-speed motor, integrated control
module with diagnostics, hot surface ignition system, multiple roll out
switches, pressure switches, aluminized steel heat exchanger and
aluminized inshot burners.
GSM
GSMS
GSU
8
Description
92.6% AFUE. Multi-position (Upflow, Horizontal), two-stage gas
valve, two-stage induced draft motor, psc multi-speed motor,
integrated control module with diagnostics, hot surface ignition
system, multiple roll out switches, pressure switches, aluminized
92.6% AFUE. Multi-position (Upflow, Horizontal Left or Right), singlestage application, induced draft, psc multi-speed motor, integrated
control module with diagnostics, hot surface ignition system, multiple
roll out switches, pressure switches, aluminized steel heat
exchanger and inshot burners.
92.6% AFUE. (Upflow Only), two0stage gas valve, induced draft
motor, psc multi-speed motor, integrated control module with
diagnostics, hot surface ignition system, flame roll-out switch,
pressure switches, aluminized stell heat exchanger, stainless steel
secondary heat exchanger and aluminized inshot burners.
X
X
X
X
GMPE
X
X
X
GSM
X
X
GSU
GMPN
X
GMNT
GMNTE
GSMS
X
GMPH
X
CVK
X
X
Conventric Vent Kit
X
GMPV
SBM
GPD
Combustible Floor Base
X
SVB-80
X
Sidewall Venting
X
HA-02
X
Orifices (6 ea./PACK)
(0.43) B2589901 / (0.44) B2589902
(0.45) B2589903 / (0.46) B2589904
(0.47) B2589905 / (0.48) B2589906
(0.49) B2589907 / (0.55) B2589900
(0.56) B2589908 / (0.57) B2589909
(0.58) B2589910
X
GMTH
LPT-00/00A
X
X
Honeywell Spring B1880006
White-Rodgers Spring B1880007
Orifice (0.55) B4089955
X
X
LPT-01/01A
X
Honeywell Spring B1880006
White-Rodgers Spring B1880007
Orifice (1.25) B40899125
GMPH
LPM-04
GDT
2-Stage LP Gas Valve B1282624
Honeywell Spring B1880006
White-Rodgers Spring B1880007
Orifice (1.25) B25899125
X
X
LPM-03
X
X
LP Gas Valve B1282618
Honeywell Spring B1880006
White-Rodgers Spring B1880007
Orifice (1.25) B25899125
X
X
LPM-01
X
X
Honeywell Spring B1880006
White-Rodgers Spring B1880004
Orifice (0.55) B2589900
GMT
GMP
PLPT-00A
Model
Number
Where
Used
Honeywell Spring B1880006
White-Rodgers Spring B1880007
Orifice (0.55) B4089955
ACCESSORIES
ACCESSORIES
X
X
GSU
X
X
X
X
GMNV
X
X
X
X
X
X
X
X
X
X
X
X
X
Not used in this application
9
PRODUCT IDENTIFICATION
LIGHTING INSTRUCTIONS
GMT
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING:
Improper
ent, alteration, service
cause injury or propthe user's information
this furnace. For assB. BEFORE OPERATING smell around
control switch or knob. Never use
tools. If the gas control switch or knob
smell next to the floor because some gas
Force or attempted repair may result in
vice agency or the
gas supplier.
WHAT TO DO IF YOU SMELL GAS
This furnace must be
Do not touch any electric switch;
the control system and any gas control
which has been under water.
ce with the manufacturers instructions
the gas suppliers instructions.
OPERATING INSTRUCTIONS
gas, go to the next step.
8. Move the gas control switch or knob
PGB & PGJ
For outdoor install-
9. Replace control access panel.
WARNING:
5. Remove control access panel.
6. Move the gas control switch or knob
to "OFF".
follow the instructions "To Turn Off Gas
technician or gas supplier.
If not ins-
acturer's instructions,
this product could
expose you to substances in fuel combustion which can cause
ess and which are
GAS CONTROL
GAS CONTROL
TO TURN OFF GAS TO APPLIANCE
4. Move the gas control switch or knob
to "OFF". Do not force.
appliance if service is to be performed.
cancer, birth defects
or other reproductive
harm.
This product contains
contains a chemical
5. Replace control access panel.
3. Remove control access panel.
FOR YOUR SAFETY
Do not store or use gasoline or
other flammable vapors and liquids in the vicinity of this
or any other appliance.
10
PRODUCT IDENTIFICATION
LIGHTING INSTRUCTIONS
GMP, GMPE, GMPN, GMNT, GMTH
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING
A. This appliance does not have a pilot. It
is equipped with an ignition device which
automatically lights the burners. Do not
try to light the burners by hand.
B. BEFORE OPERATING smell around
the appliance area for gas. Be sure to
smell next to the floor because some gas
is heavier than air and will settle on the
floor.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electric switch;
do not use any telephone in your
building.
Immediately call your supplier
from a neighbor's phone. Follow
the gas suppliers instructions.
If you do not follow these instructions exactly,
a fire or explosion may result causing property
damage, personal injury or loss of life.
If you cannot reach your gas supplier,
call the fire department.
C. Use only your hand to move the gas
control switch or knob. Never use
tools. If the gas control switch or knob
will not operate, don't try to repair it,
call a qualified service technician.
Force or attempted repair may result in
a fire or explosion.
D. Do not use this appliance if any part
has been under water. Immediately call
a qualified service technician to inspect
the appliance and to replace any part of
the control system and any gas control
which has been under water.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information
above on this label.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the appliance.
4. This appliance is equipped with an
automatic ignition system which automatically lights the burners. Do not try to
light the burners by hand.
5. Remove control access panel.
6. Move the gas control switch or knob
to "OFF".
GAS CONTROL
SWITCH SHOWN
IN "ON" POSITION
7. Wait five (5) minutes to clear out any
gas. If you then smell gas, STOP!
Follow "B" in the safety information
above on this label. If you don't smell
gas, go to the next step.
8. Move the gas control switch or knob
to "ON".
9. Replace control access panel.
10. Turn on all electric power to the
appliance.
11. Set the thermostat to the desired
setting.
12. If the appliance will not operate,
follow the instructions "To Turn Off Gas
To Appliance" and call your service
technician or gas supplier.
KNOB
ON
OFF
GAS CONTROL
GAS CONTROL
SWITCH SHOWN
IN "ON" POSITION
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to its lowest setting.
2. Turn off all electric power to the
appliance if service is to be performed.
4. Move the gas control switch or knob
to "OFF". Do not force.
5. Replace control access panel.
3. Remove control access panel.
WARNING: Improper
installation, adjustment, alteration, service
or maintenance can
cause injury or property damage. Refer to
the user's information
manual provided with
this furnace. For assistance or additional
information consult a
qualified installer, service agency or the
gas supplier.
This furnace must be
installed in accordance with the manufacturers instructions
and local codes. In
the absence of local
codes follow the
National Fuel Gas
Code, ANSI Z223.1.
For indoor installation.
PGB & PGJ
For outdoor installation only.
WARNING: If not installed, operated and
maintained in accordance with the manufacturer's instructions,
this product could
expose you to substances in fuel combustion which can cause
death or serious illness and which are
known to the State of
California to cause
cancer, birth defects
or other reproductive
harm.
This product contains
fiberglass insulation.
Fiberglass insulation
contains a chemical
known by the State of
California to cause
cancer.
FOR YOUR SAFETY Do not store or use gasoline or
other flammable vapors and liquids in the vicinity of this
or any other appliance.
11
PRODUCT IDENTIFICATION
LIGHTING INSTRUCTIONS
GMP, GMPE, GMPN
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING
A. This appliance does not have a pilot. It
is equipped with an ignition device which
automatically lights the burners. Do not
try to light the burners by hand.
B. BEFORE OPERATING smell around
the appliance area for gas. Be sure to
smell next to the floor because some gas
is heavier than air and will settle on the
floor.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electric switch;
do not use any telephone in your
building.
Immediately call your supplier
from a neighbor's phone. Follow
the gas suppliers instructions.
If you do not follow these instructions exactly,
a fire or explosion may result causing property
damage, personal injury or loss of life.
If you cannot reach your gas supplier,
call the fire department.
C. Use only your hand to move the gas
control switch or knob. Never use
tools. If the gas control switch or knob
will not operate, don't try to repair it,
call a qualified service technician.
Force or attempted repair may result in
a fire or explosion.
D. Do not use this appliance if any part
has been under water. Immediately call
a qualified service technician to inspect
the appliance and to replace any part of
the control system and any gas control
which has been under water.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information
above on this label.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the appliance.
4. This appliance is equipped with an
automatic ignition system which automatically lights the burners. Do not try to
light the burners by hand.
5. Remove control access panel.
6. Move the gas control switch or knob
to "OFF".
X
X
X
X
P,M
O
F
F
C
HI
REP
8. Move the gas control switch or knob
to "ON".
11. Set the thermostat to the desired
setting.
12. If the appliance will not operate,
follow the instructions "To Turn Off Gas
To Appliance" and call your service
technician or gas supplier.
SCR
L O
GAS CONTROL
SWITCH SHOWN
IN "ON" POSITION
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to its lowest setting.
2. Turn off all electric power to the
appliance if service is to be performed.
4. Move the gas control switch or knob
to "OFF". Do not force.
5. Replace control access panel.
3. Remove control access panel.
FOR YOUR SAFETY Do not store or use gasoline or
other flammable vapors and liquids in the vicinity of this
or any other appliance.
12
This furnace must be
installed in accordance with the manufacturers instructions
and local codes. In
the absence of local
codes follow the
National Fuel Gas
Code, ANSI Z223.1.
For indoor installation.
PGB & PGJ
For outdoor installation only.
9. Replace control access panel.
10. Turn on all electric power to the
appliance.
EW
C
ON
7. Wait five (5) minutes to clear out any
gas. If you then smell gas, STOP!
Follow "B" in the safety information
above on this label. If you don't smell
gas, go to the next step.
WARNING: Improper
installation, adjustment, alteration, service
or maintenance can
cause injury or property damage. Refer to
the user's information
manual provided with
this furnace. For assistance or additional
information consult a
qualified installer, service agency or the
gas supplier.
WARNING: If not installed, operated and
maintained in accordance with the manufacturer's instructions,
this product could
expose you to substances in fuel combustion which can cause
death or serious illness and which are
known to the State of
California to cause
cancer, birth defects
or other reproductive
harm.
This product contains
fiberglass insulation.
Fiberglass insulation
contains a chemical
known by the State of
California to cause
cancer.
SPECIFICATIONS
MODEL
GMT
GMT045-3
GMT070-3
GMT070-4
GMT090-3
GMT090-5
GMT090-5
GMT115-5
GMT135-5
45,000
70,000
70,000
90,000
90,000
90,000
115,000
140,000
36,000
56,000
56,000
72,000
72,000
72,000
92,000
108,000
40,000
60,000
60,000
80,000
80,000
80,000
100,000
120,000
32,000
48,000
48,000
64,000
64,000
64,000
80,000
96,000
80%
80%
80%
80%
80%
80%
80%
80%
Rated External Static (" w.c.)
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
Temperature Rise (°F)
45 - 75
Btuh Input (US) Natural Gas
Output (US) Natural Gas
Btuh Input (US) LP Gas
Output (US) LP Gas
A.F.U.E.
25 - 55
25 - 55
20 - 50
35 - 65
35 - 65
35 - 65
35 - 65
Pressure Switch Trip Point (" w.c.)
-0.60
-0.60
-0.60
-0.60
-0.60
-0.70
-0.70
-0.75
Blower Wheel (D" x W")
10 X 6
10 X 6
10 X 8
10 X 8
10 X 8
10 X 10
10 X 10
11 x 10
1/3
1/3
1/2
1/3
1/2
1/2
1/2
3/4
3
3
3
3
3
3
3
3
1438
1165
1518
1400
1532
1875
1988
2209
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
5.2
5.2
7.8
5.2
7.8
7.8
7.8
9.6
15.0
15.0
15.0
15.0
15.0
15.0
15.0
15.0
Blower Horsepower
Blower Speeds
Max CFM @ 0.5 E.S.P.
Power Supply
Minimum Circuit Ampacity (MCA)
Maximum Overcurrent Device
Transformer (VA)
40
40
40
40
40
40
40
40
Primary Limit Setting (°F)
300
180
170
210
210
320
220
160
Auxiliary Limit Setting (°F)
120
120
120
120
120
120
120
120
Rollout Limit Setting (°F)
300
300
300
300
300
300
300
300
Fan Delay On Heating
Off Heating *
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
Fan Delay On Cooling
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
Off Cooling
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
Fan Delay On - Fan Only
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
3.5 / 10
3.5 /10
3.5 /10
3.5 / 10
3.5 / 10
3.5 / 10
3.5 / 10
3.5 / 10
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
2
3
3
4
4
4
5
6
Permanent
290
290
385
290
385
480
480
480
Disposable
580
580
770
580
770
960
960
960
4
4
4
4
4
4
4
4
114
124
136
146
146
156
166
176
Gas Supply Pressure (Natural/Propane) (" w.c.)
Manifold Pressure (Natural/Propane) (" w.c.)
Orifice Size (Natural/Propane)
Num ber of Burners
Filter Size (in2.)
Vent Connector Diameter (inches)
Shipping Weight (lbs.)
* Off Heating - This fan delay timing is adjustable (90, 120 or 150 seconds), 150 seconds as shipped.
1
Vent and combustion air diameters may vary depending upon vent length. Refer to furnace installation instructions.
Minimum Circuit Ampacity = (1.25 x Circulator Blow er Amps) + ID Blow er amps.
3 Maximum Overcurrent Protection refers to maximum recommended fuse or circuit breaker size.
NOTES:
1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.
2. Gas Service Connection 1/2" FPT.
3. Important: It is required to size fuses and w ires properly and make electrical connections in accordance w ith the National Electrical
Code and/or all existing local codes.
2
13
SPECIFICATIONS
MODEL
GMT*A/B
GMT045-3A/B GMT070-3A/B GMT070-4A/B GMT090-3A/B GMT090-4A/B GMT090-5A/B GMT115-5A/B GMT140-5A/B
Btuh Input (US) Natural Gas
45,000
70,000
70,000
90,000
90,000
90,000
115,000
140,000
Output (US) Natural Gas
36,000
56,000
56,000
72,000
72,000
72,000
92,000
112,000
Btuh Input (US) LP Gas
40,000
60,000
60,000
80,000
80,000
80,000
100,000
120,000
Output (US) LP Gas
32,000
48,000
48,000
64,000
64,000
64,000
80,000
96,000
80%
80%
80%
80%
80%
80%
80%
80%
Rated External Static (" w.c.)
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
Temperature Rise (°F)
40 - 70
A.F.U.E.
25 - 55
25 - 55
20 - 50
35 - 65
35 - 65
35 - 65
35 - 65
Pressure Switch Trip Point (" w.c.)
-0.60
-0.60
-0.60
-0.60
-0.60
-0.70
-0.70
-0.75
Blower Wheel (D" x W")
10 X 6
10 X 6
10 X 8
10 X 8
10 X 8
10 X 10
10 X 10
11 x 10
1/3
1/3
1/2
1/3
1/2
1/2
1/2
3/4
3
3
3
3
3
3
3
3
1438
1165
1518
1400
1532
1875
1809
1987
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
5.2
5.2
7.8
5.2
7.8
7.8
7.8
9.6
15.0
15.0
15.0
15.0
15.0
15.0
15.0
15.0
Transformer (VA)
40
40
40
40
40
40
40
40
Primary Limit Setting (°F)
300
180
170
210
210
320
220
160
Auxiliary Limit Setting (°F)
120
120
120
120
120
120
120
120
Rollout Limit Setting (°F)
300
300
300
300
300
300
300
300
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
Blower Horsepower
Blower Speeds
Max CFM @ 0.5 E.S.P.
Power Supply
Minimum Circuit Ampacity (MCA)
Maximum Overcurrent Device
Fan Delay On Heating
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
Fan Delay On Cooling
Off Heating *
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
Off Cooling
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
Fan Delay On - Fan Only
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
3.5 / 10
3.5 /10
3.5 /10
3.5 / 10
3.5 / 10
3.5 / 10
3.5 / 10
3.5 / 10
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
2
3
3
4
4
4
5
6
Permanent
290
290
385
290
385
480
480
480
Disposable
580
580
770
580
770
960
960
960
4
4
4
4
4
4
4
4
120
130
143
153
153
163
163
183
Gas Supply Pressure (Natural/Propane) (" w.c.)
Manifold Pressure (Natural/Propane) (" w.c.)
Orifice Size (Natural/Propane)
Number of Burners
2
Filter Size (in .)
Vent Connector Diameter (inches)
Shipping Weight (lbs.)
* Off Heating - This fan delay timing is adjustable (90, 120 or 150 seconds), 150 seconds as shipped.
1
Vent and combustion air diameters may vary depending upon vent length. Refer to furnace installation instructions.
Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.
3
Maximum Overcurrent Protection refers to maximum recommended fuse or circuit breaker size.
NOTES:
1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.
2. Gas Service Connection 1/2" FPT.
3. Important: It is required to size fuses and wires properly and make electrical connections in accordance with the National Electrical
Code and/or all existing local codes.
2
14
SPECIFICATIONS
MODEL
GMT
GMT045-3
GMT070-3
GMT070-4
GMT090-3
GMT090-5
GMT090-5
GMT115-5
GMT135-5
45,000
70,000
70,000
90,000
90,000
90,000
115,000
140,000
36,000
56,000
56,000
72,000
72,000
72,000
92,000
108,000
40,000
60,000
60,000
80,000
80,000
80,000
100,000
120,000
32,000
48,000
48,000
64,000
64,000
64,000
80,000
96,000
80%
80%
80%
80%
80%
80%
80%
80%
Rated External Static (" w.c.)
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
Temperature Rise (°F)
45 - 75
Btuh Input (US) Natural Gas
Output (US) Natural Gas
Btuh Input (US) LP Gas
Output (US) LP Gas
A.F.U.E.
25 - 55
25 - 55
20 - 50
35 - 65
35 - 65
35 - 65
35 - 65
Pressure Switch Trip Point (" w.c.)
-0.60
-0.60
-0.60
-0.60
-0.60
-0.70
-0.70
-0.75
Blower Wheel (D" x W")
10 X 6
10 X 6
10 X 8
10 X 8
10 X 8
10 X 10
10 X 10
11 x 10
1/3
1/3
1/2
1/3
1/2
1/2
1/2
3/4
3
3
3
3
3
3
3
3
1438
1165
1518
1400
1532
1875
1988
2209
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
5.2
5.2
7.8
5.2
7.8
7.8
7.8
9.6
15.0
15.0
15.0
15.0
15.0
15.0
15.0
15.0
Blower Horsepower
Blower Speeds
Max CFM @ 0.5 E.S.P.
Power Supply
Minimum Circuit Ampacity (MCA)
Maximum Overcurrent Device
Transformer (VA)
40
40
40
40
40
40
40
40
Primary Limit Setting (°F)
300
180
170
210
210
320
220
160
Auxiliary Limit Setting (°F)
120
120
120
120
120
120
120
120
Rollout Limit Setting (°F)
300
300
300
300
300
300
300
300
Fan Delay On Heating
Off Heating *
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
Fan Delay On Cooling
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
Off Cooling
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
Fan Delay On - Fan Only
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
3.5 / 10
3.5 /10
3.5 /10
3.5 / 10
3.5 / 10
3.5 / 10
3.5 / 10
3.5 / 10
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
2
3
3
4
4
4
5
6
Permanent
290
290
385
290
385
480
480
480
Disposable
580
580
770
580
770
960
960
960
4
4
4
4
4
4
4
4
114
124
136
146
146
156
166
176
Gas Supply Pressure (Natural/Propane) (" w.c.)
Manifold Pressure (Natural/Propane) (" w.c.)
Orifice Size (Natural/Propane)
Num ber of Burners
Filter Size (in2.)
Vent Connector Diameter (inches)
Shipping Weight (lbs.)
* Off Heating - This fan delay timing is adjustable (90, 120 or 150 seconds), 150 seconds as shipped.
1
Vent and combustion air diameters may vary depending upon vent length. Refer to furnace installation instructions.
Minimum Circuit Ampacity = (1.25 x Circulator Blow er Amps) + ID Blow er amps.
3 Maximum Overcurrent Protection refers to maximum recommended fuse or circuit breaker size.
NOTES:
1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.
2. Gas Service Connection 1/2" FPT.
3. Important: It is required to size fuses and w ires properly and make electrical connections in accordance w ith the National Electrical
Code and/or all existing local codes.
2
15
SPECIFICATIONS
MODEL
GMT*A/B
GMT045-3A/B GMT070-3A/B GMT070-4A/B GMT090-3A/B GMT090-4A/B GMT090-5A/B GMT115-5A/B GMT140-5A/B
Btuh Input (US) Natural Gas
45,000
70,000
70,000
90,000
90,000
90,000
115,000
140,000
Output (US) Natural Gas
36,000
56,000
56,000
72,000
72,000
72,000
92,000
112,000
Btuh Input (US) LP Gas
40,000
60,000
60,000
80,000
80,000
80,000
100,000
120,000
Output (US) LP Gas
32,000
48,000
48,000
64,000
64,000
64,000
80,000
96,000
80%
80%
80%
80%
80%
80%
80%
80%
Rated External Static (" w.c.)
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
.10 - .50
Temperature Rise (°F)
A.F.U.E.
25 - 55
25 - 55
20 - 50
35 - 65
35 - 65
35 - 65
35 - 65
40 - 70
Pressure Switch Trip Point (" w.c.)
-0.60
-0.60
-0.60
-0.60
-0.60
-0.70
-0.70
-0.75
Blower Wheel (D" x W")
10 X 6
10 X 6
10 X 8
10 X 8
10 X 8
10 X 10
10 X 10
11 x 10
1/3
1/3
1/2
1/3
1/2
1/2
1/2
3/4
3
3
3
3
3
3
3
3
1438
1165
1518
1400
1532
1875
1809
1987
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
115-60-1
5.2
5.2
7.8
5.2
7.8
7.8
7.8
9.6
15.0
15.0
15.0
15.0
15.0
15.0
15.0
15.0
Blower Horsepower
Blower Speeds
Max CFM @ 0.5 E.S.P.
Power Supply
Minimum Circuit Ampacity (MCA)
Maximum Overcurrent Device
Transformer (VA)
40
40
40
40
40
40
40
40
Primary Limit Setting (°F)
300
180
170
210
210
320
220
160
Auxiliary Limit Setting (°F)
120
120
120
120
120
120
120
120
Rollout Limit Setting (°F)
300
300
300
300
300
300
300
300
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
30 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
150 secs.
Fan Delay On Heating
Off Heating *
Fan Delay On Cooling
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
Off Cooling
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
60 secs.
Fan Delay On - Fan Only
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
5 secs.
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
7 / 11
3.5 / 10
3.5 /10
3.5 /10
3.5 / 10
3.5 / 10
3.5 / 10
3.5 / 10
3.5 / 10
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
#43 / #55
2
3
3
4
4
4
5
6
Permanent
290
290
385
290
385
480
480
480
Disposable
580
580
770
580
770
960
960
960
4
4
4
4
4
4
4
4
120
130
143
153
153
163
163
183
Gas Supply Pressure (Natural/Propane) (" w.c.)
Manifold Pressure (Natural/Propane) (" w.c.)
Orifice Size (Natural/Propane)
Number of Burners
2
Filter Size (in .)
Vent Connector Diameter (inches)
Shipping Weight (lbs.)
* Off Heating - This fan delay timing is adjustable (90, 120 or 150 seconds), 150 seconds as shipped.
1
Vent and combustion air diameters may vary depending upon vent length. Refer to furnace installation instructions.
Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.
3
Maximum Overcurrent Protection refers to maximum recommended fuse or circuit breaker size.
NOTES:
1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.
2. Gas Service Connection 1/2" FPT.
3. Important: It is required to size fuses and wires properly and make electrical connections in accordance with the National Electrical
Code and/or all existing local codes.
2
16
SPECIFICATIONS
MODEL
GDT
GDT045-3
GDT070-3
GDT090-4
GDT115-5
Btuh Input (US) Natural Gas
45,000
70,000
100,000
115,000
Output (US) Natural Gas
36,000
56,000
80,000
100,000
Btuh Input (US) LP Gas
40,000
60,000
80,000
100,000
Output (US) LP Gas
32,000
48,000
64,000
80,000
80%
80%
80%
80%
Rated External Static (" w.c.)
.10 - .50
.10 - .50
.10 - .50
.10 - .50
Temperature Rise (°F)
25 - 55
30 - 60
40 - 70
45 - 75
Pressure Switch Trip Point (" w.c.)
-0.60
-0.60
-0.60
-0.70
Blower Wheel (D" x W")
10 X 6
10 X 6
10 X 8
10 X 10
1/3
1/3
1/2
1/2
3
3
3
3
1340
1225
1670
1965
115-60-1
115-60-1
115-60-1
115-60-1
Minimum Circuit Ampacity (MCA)
5.2
5.2
7.8
7.8
Maximum Overcurrent Device
15.0
15.0
15.0
15.0
Transformer (VA)
40
40
40
40
Primary Limit Setting (°F)
300
240
250
220
Auxiliary Limit Setting (°F)
120
120
120
120
Rollout Limit Setting (°F)
300
300
300
300
30 secs.
30 secs.
30 secs.
30 secs.
150 secs.
150 secs.
150 secs.
150 secs.
5 secs.
5 secs.
5 secs.
5 secs.
Off Cooling
60 secs.
60 secs.
60 secs.
60 secs.
Fan Delay On - Fan Only
5 secs.
5 secs.
5 secs.
5 secs.
7 / 11
7 / 11
7 / 11
7 / 11
3.5 / 10
3.5 /10
3.5 / 10
3.5 / 10
#43 / #55
#43 / #55
#43 / #55
#43 / #55
2
3
4
5
290
290
385
480
580
580
770
960
4
4
4
4
114
124
146
168
A.F.U.E.
Blower Horsepower
Blower Speeds
Max CFM @ 0.5 E.S.P.
Power Supply
Fan Delay On Heating
Off Heating *
Fan Delay On Cooling
Gas Supply Pressure (Natural/Propane) (" w.c.)
Manifold Pressure (Natural/Propane) (" w.c.)
Orifice Size (Natural/Propane)
Number of Burners
2
Filter Size (in .)
Permanent
Disposable
Vent Connector Diameter (inches)
Shipping Weight (lbs.)
* Off Heating - This fan delay timing is adjustable (90, 120 or 150 seconds), 150 seconds as shipped.
Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.3 Maximum Overcurrent Protection refers to maximum recommended fuse or
circuit breaker size.
NOTES: 1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.
2. Gas Service Connection 1/2" FPT.
3. Important: It is required to size fuses and wires properly and make electrical connections in accordance with the National Electrical Code
and/or all existing local codes.
17
SPECIFICATIONS
MODEL
GDT-A
GDT045-3A
GDT070-3A
GDT090-4A
GDT115-5A
Btuh Input (US) Natural Gas
45,000
70,000
100,000
115,000
Output (US) Natural Gas
36,000
56,000
72,000
100,000
Btuh Input (US) LP Gas
40,000
60,000
80,000
100,000
Output (US) LP Gas
32,000
48,000
64,000
80,000
80%
80%
80%
80%
Rated External Static (" w.c.)
.10 - .50
.10 - .50
.10 - .50
.10 - .50
Temperature Rise (°F)
25 - 55
30 - 60
35 - 65
40 - 70
-0.60
-0.60
-0.60
-0.70
10 X 6
10 X 6
10 X 8
10 X 10
1/3
1/3
1/2
1/2
3
3
3
3
1340
1225
1670
1965
115-60-1
115-60-1
115-60-1
115-60-1
Minimum Circuit Ampacity (MCA)
5.2
5.2
7.8
7.8
Maximum Overcurrent Device
15.0
15.0
15.0
15.0
Transformer (VA)
40
40
40
40
Primary Limit Setting (°F)
300
240
250
220
Auxiliary Limit Setting (°F)
120
120
120
120
Rollout Limit Setting (°F)
300
300
300
300
30 secs.
30 secs.
30 secs.
30 secs.
150 secs.
150 secs.
150 secs.
150 secs.
5 secs.
5 secs.
5 secs.
5 secs.
Off Cooling
60 secs.
60 secs.
60 secs.
60 secs.
Fan Delay On - Fan Only
5 secs.
5 secs.
5 secs.
5 secs.
7 / 11
7 / 11
7 / 11
7 / 11
3.5 / 10
3.5 /10
3.5 / 10
3.5 / 10
#43 / #55
#43 / #55
#43 / #55
#43 / #55
2
3
4
5
290
290
385
480
580
580
770
960
4
4
4
4
120
130
153
175
A.F.U.E.
Pressure Switch Trip Point (" w.c.)
Blower Wheel (D" x W")
Blower Horsepower
Blower Speeds
Max CFM @ 0.5 E.S.P.
Power Supply
Fan Delay On Heating
Off Heating *
Fan Delay On Cooling
Gas Supply Pressure (Natural/Propane) (" w.c.)
Manifold Pressure (Natural/Propane) (" w.c.)
Orifice Size (Natural/Propane)
Number of Burners
2
Filter Size (in .)
Permanent
Disposable
Vent Connector Diameter (inches)
Shipping Weight (lbs.)
* Off Heating - This fan delay timing is adjustable (90, 120 or 150 seconds), 150 seconds as shipped.
Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.3 Maximum Overcurrent Protection refers to maximum recommended fuse or
circuit breaker size.
NOTES: 1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.
2. Gas Service Connection 1/2" FPT.
3. Important: It is required to size fuses and wires properly and make electrical connections in accordance with the National Electrical Code
and/or all existing local codes.
18
SPECIFICATIONS
MODEL
GDT-B
GDT045-3B
GDT070-3B
GDT090-4B
GDT115-5B
Btuh Input (US) Natural Gas
45,000
70,000
100,000
115,000
Output (US) Natural Gas
36,000
56,000
72,000
92,000
Btuh Input (US) LP Gas
40,000
60,000
80,000
100,000
Output (US) LP Gas
32,000
48,000
64,000
80,000
80%
80%
80%
80%
Rated External Static (" w.c.)
.10 - .50
.10 - .50
.10 - .50
.10 - .50
Temperature Rise (°F)
20 - 50
30 - 60
35 - 65
40 - 70
-0.60
-0.60
-0.60
-0.70
10 X 6
10 X 6
10 X 8
10 X 10
1/3
1/3
1/2
1/2
4
4
4
4
1262
1262
1844
2134
115-60-1
115-60-1
115-60-1
115-60-1
Minimum Circuit Ampacity (MCA)
8.1
8.1
12.5
12.5
Maximum Overcurrent Device
15.0
15.0
15.0
15.0
Transformer (VA)
40
40
40
40
Primary Limit Setting (°F)
300
240
250
220
Auxiliary Limit Setting (°F)
120
120
120
120
Rollout Limit Setting (°F)
300
300
300
300
30 secs.
30 secs.
30 secs.
30 secs.
150 secs.
150 secs.
150 secs.
150 secs.
5 secs.
5 secs.
5 secs.
5 secs.
Off Cooling
60 secs.
60 secs.
60 secs.
60 secs.
Fan Delay On - Fan Only
5 secs.
5 secs.
5 secs.
5 secs.
7 / 11
7 / 11
7 / 11
7 / 11
3.5 / 10
3.5 /10
3.5 / 10
3.5 / 10
#43 / #55
#43 / #55
#43 / #55
#43 / #55
2
3
4
5
290
290
385
480
580
580
770
960
4
4
4
4
120
130
153
175
A.F.U.E.
Pressure Switch Trip Point (" w.c.)
Blower Wheel (D" x W")
Blower Horsepower
Blower Speeds
Max CFM @ 0.5 E.S.P.
Power Supply
Fan Delay On Heating
Off Heating *
Fan Delay On Cooling
Gas Supply Pressure (Natural/Propane) (" w.c.)
Manifold Pressure (Natural/Propane) (" w.c.)
Orifice Size (Natural/Propane)
Number of Burners
2
Filter Size (in .)
Permanent
Disposable
Vent Connector Diameter (inches)
Shipping Weight (lbs.)
* Off Heating - This fan delay timing is adjustable (90, 120 or 150 seconds), 150 seconds as shipped.
Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.3 Maximum Overcurrent Protection refers to maximum recommended fuse or
circuit breaker size.
NOTES: 1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.
2. Gas Service Connection 1/2" FPT.
3. Important: It is required to size fuses and wires properly and make electrical connections in accordance with the National Electrical Code
and/or all existing local codes.
19
SPECIFICATIONS
GMTH
MODEL
GMTH045-3
GMTH070-3
GMTH115-5
Btuh Input (US) Natural Gas
45,000
70,000
115,000
Output (US) Natural Gas
36,000
56,000
92,000
Btuh Input (US) LP Gas
40,000
60,000
100,000
Output (US) LP Gas
32,000
48,000
80,000
80%
80%
80%
Rated External Static (" w.c.)
.10 - .50
.10 - .50
.10 - .50
Temperature Rise (°F)
15 - 45
20 - 50
35 - 65
Pressure Switch Trip Point (" w.c.)
-0.60
-0.60
-1.00
Blower Wheel (D" x W")
10 X 6
11 X 8
11 X 10
1/3
3/4
3/4
3
3
3
1490
1891
2188
115-60-1
115-60-1
115-60-1
Minimum Circuit Ampacity (MCA)
7.8
9.6
9.6
Maximum Overcurrent Device
15.0
15.0
15.0
Transformer (VA)
40
40
40
Primary Limit Setting (°F)
230
240
300
Auxiliary Limit Setting (°F)
120
120
120
Rollout Limit Setting (°F)
300
300
300
30 secs.
30 secs.
30 secs.
150 secs.
150 secs.
150 secs.
5 secs.
5 secs.
5 secs.
Off Cooling
60 secs.
60 secs.
60 secs.
Fan Delay On - Fan Only
5 secs.
5 secs.
5 secs.
7 / 11
7 / 11
7 / 11
3.5 / 10
3.5 /10
3.5 / 10
#43 / #55
#43 / #55
#43 / #55
2
3
5
290
385
480
580
770
960
4
4
4
114
140
170
A.F.U.E.
Blower Horsepower
Blower Speeds
Max CFM @ 0.5 E.S.P.
Power Supply
Fan Delay On Heating
Off Heating *
Fan Delay On Cooling
Gas Supply Pressure (Natural/Propane) (" w.c.)
Manifold Pressure (Natural/Propane) (" w.c.)
Orifice Size (Natural/Propane)
Number of Burners
2
Filter Size (in .)
Permanent
Disposable
Vent Connector Diameter (inches)
Shipping Weight (lbs.)
* Off Heating - This fan delay timing is adjustable (90, 120 or 150 seconds), 150 seconds as shipped.
Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.3 Maximum Overcurrent Protection refers to maximum recommended fuse or
circuit breaker size.
NOTES: 1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.
2. Gas Service Connection 1/2" FPT.
3. Important: It is required to size fuses and wires properly and make electrical connections in accordance with the National Electrical Code
and/or all existing local codes.
20
SPECIFICATIONS
MODEL
GMTH-A/B
GMTH045-3A/B GMTH070-3A/B GMTH090-5A/B
Btuh Input (US) Natural Gas
45,000
70,000
90,000
Output (US) Natural Gas
36,000
56,000
72,000
Btuh Input (US) LP Gas
40,000
60,000
80,000
Output (US) LP Gas
32,000
48,000
64,000
80%
80%
80%
Rated External Static (" w.c.)
.10 - .50
.10 - .50
.10 - .50
Temperature Rise (°F)
15 - 45
20 - 50
35 - 65
-0.60
-0.60
-0.70
10 X 6
10 X 8
11 X 10
1/3
3/4
3/4
4
3
3
1499
1773
2134
115-60-1
115-60-1
115-60-1
Minimum Circuit Ampacity (MCA)
12.5
11.8
11.8
Maximum Overcurrent Device
15.0
15.0
15.0
Transformer (VA)
40
40
40
Primary Limit Setting (°F)
230
240
240
Auxiliary Limit Setting (°F)
120
120
120
Rollout Limit Setting (°F)
300
300
300
30 secs.
30 secs.
30 secs.
150 secs.
150 secs.
150 secs.
5 secs.
5 secs.
5 secs.
Off Cooling
60 secs.
60 secs.
60 secs.
Fan Delay On - Fan Only
5 secs.
5 secs.
5 secs.
7 / 11
7 / 11
7 / 11
3.5 / 10
3.5 /10
3.5 /10
#43 / #55
#43 / #55
#43 / #55
2
3
4
290
385
480
580
770
960
4
4
4
120
130
153
A.F.U.E.
Pressure Switch Trip Point (" w.c.)
Blower Wheel (D" x W")
Blower Horsepower
Blower Speeds
Max CFM @ 0.5 E.S.P.
Power Supply
Fan Delay On Heating
Off Heating *
Fan Delay On Cooling
Gas Supply Pressure (Natural/Propane) (" w.c.)
Manifold Pressure (Natural/Propane) (" w.c.)
Orifice Size (Natural/Propane)
Number of Burners
2
Filter Size (in .)
Permanent
Disposable
Vent Connector Diameter (inches)
Shipping Weight (lbs.)
* Off Heating - This fan delay timing is adjustable (90, 120 or 150 seconds), 150 seconds as shipped.
Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.3 Maximum Overcurrent Protection refers to maximum recommended fuse or
circuit breaker size.
NOTES: 1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.
2. Gas Service Connection 1/2" FPT.
3. Important: It is required to size fuses and wires properly and make electrical connections in accordance with the National Electrical Code
and/or all existing local codes.
21
GMP
SPECIFICATIONS
PERFORMANCE RATINGS
Natural Gas
Input
Natural Gas
Heating Capacity
Btuh
Btuh
GMP050-3
45,000
GMP075-3
DOE**
AFUE
Temperature
Rise Range
(°F)
36,000
80.0
25 - 55
75,000
60,000
80.0
35 - 65
GMP075-4
75,000
60,000
80.0
25 - 55
GMP100-3
100,000
80,000
80.0
45 - 75
GMP100-4
100,000
80,000
80.0
35 - 65
GMP100-5
100,000
80,000
80.0
35 - 65
GMP125-4
125,000
100,000
80.0
45 - 75
GMP125-5
125,000
100,000
80.0
45 - 75
GMP150-5
140,000
112,000
80.0
35 - 65
Model
Number
BEFORE PURCHASING THIS APPLIANCE, READ IMPORTANT ENERGY COST AND EFFICIENCY
INFORMATION AVAILABLE FROM YOUR RETAILER.
SPECIFICATION DATA
Circulator Blower
Model
Number
Vent
1
No. of Diameter
(in.)
Speeds
Filter Size (in2.)4
Minimum Maximum
Overcurrent
Circuit
2
Ampacity Protection3
(Amps)
(Amps)
Ship. Wt.
(lbs)
Size
(D"xW")
HP
GMP050-3
10 X 6
1/3
4
4
14 X 25
5.2
15.0
114
GMP075-3
10 X 6
1/3
4
4
14 X 25
5.2
15.0
124
GMP075-4
10 X 8
1/2
3
4
16 X 25
7.8
15.0
136
GMP100-3
10 X 8
1/3
4
4
16 X 25
5.2
15.0
146
GMP100-4
10 X 8
1/2
3
4
16 X 25
7.8
15.0
146
GMP100-5
11 X 10
3/4
3
4
20 X25
8.2
15.0
156
GMP125-4
10 x 10
1/2
3
4
20 X 25
7.8
15.0
166
GMP125-5
11 X 10
3/4
3
4
20 X 25
8.2
15.0
166
GMP150-5
10 X 6(2)
3/4
3
4*
24 X 25
9.6
15.0
176
1
Permanent
Vent and combustion air diameters may vary depending upon vent length. Refer to furnace installation instructions.
Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.
3
Maximum Overcurrent Protection refers to maximum recommended fuse or circuit breaker size.
4 Filter dimensions for bottom application. All models require 18" x 25" filter(s) for side air installations. Permanent air filters
recommended. Both sides or bottom inlet(s) must be used for applications over 1800 cfm.
* GMP150-5 requires 5" diameter vent in downflow configuration.
NOTES:
1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.
2. Gas Service Connection 1/2" FPT.
3. Important: It is required to size fuses and wires properly and make electrical connections in accordance with the National
Electrical Code and/or all existing local codes.
2
22
SPECIFICATIONS
GPD
PERFORMANCE RATINGS
Natural Gas (Btuh)
Model Number
Propane Gas
DOE
AFUE
Temperature Rise
Range
Input
Output
Input
Output
GPD050-3
45,000
36,000
40,000
32,000
80.0
25 - 55
GPD075-3
75,000
60,000
60,000
48,000
80.0
30 - 60
GPD100-4
100,000
80,000
80,000
64,000
80.0
40 - 70
GPD125-4
125,000
100,000
100,000
80,000
80.0
45 - 75
BEFORE PURCHASING THIS APPLIANCE, READ IMPORTANT ENERGY COST AND EFFICIENCY
INFORMATION AVAILABLE FROM YOUR RETAILER.
SPECIFICATION DATA
Circulator Blower
Model
Number
Vent
1
Diameter
No. of
(in.)
Speeds
Filter Size (in2.)
Minimum Maximum
Overcurrent Ship. Wt.
Circuit
2
(lbs)
Ampacity Protection3
(Amps)
(Amps)
Size
(D"xW")
HP
GPD050-3
10 X 6
1/3
4
4
188 x 375
5.2
15.0
114
GPD075-3
10 X 6
1/3
4
4
275 x 555
5.2
15.0
124
GPD100-4
10 X 8
1/2
3
4
303 x 606
7.8
15.0
146
GPD125-4
10 X 10
1/2
3
4
347 x 649
7.8
15.0
166
Permanent
1
Vent and combustion air diameters may vary depending upon vent length. Refer to furnace installation instructions.
Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps.
3
Maximum Overcurrent Protection refers to maximum recommended fuse or circuit breaker size.
NOTES:
1. All furnaces are manufactured for use on 115 VAC, 60 Hz, single phase electrical supply.
2. Gas Service Connection 1/2" FPT.
3. Important: It is required to size fuses and wires properly and make electrical connections in accordance with the National Electrical
Code and/or all existing local codes.
2
23
GMT
DIMENSIONS
28"
3/4"
A
3-1/4"
2"
19-5/8"
5-1/16"
B
3-1/4"
3-1/8"
3/4"
8"
12-3/4"
GAS INLET
GAS INLET
13-1/4"
39"
LOW VOLTAGE
LOW VOLTAGE
ELEC.
14-1/4"
10-1/4"
ELEC.
1-3/8"
Model Number
A
B
GMT045-3*
GMT070-3*
14"
12 1/2"
GMT070-4*
GMT090-3*
GMT090-4*
17-1/2"
16"
GMT090-5*
GMT115-5*
21"
19-1/2"
GMT140-5*
24-1/2"
23"
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
Sides
Rear
Front*
1
0
3
Vent**
SW
6
B
1
Top
1
Approved for line contact in the horizontal position.
*36" clearance for serviceability recommended.
**Single Wall Vent (SW) to be used only as a connector. Refer to the venting
tables outlined in the Installation Manual for additional venting requirements.
24
DIMENSIONS
GDT
28"
3/4"
A
19-5/8"
1-3/8"
B
3/4"
10-1/4"
LOW VOLTAGE
14-1/4"
ELEC.
39"
GAS INLET
GAS INLET
11-3/8"
8-5/8"
4-3/8"
1-7/8"
Model Number
A
B
Non Combustible
Floor Base
GDT045-3*
GDT070-3*
14"
12-1/2"
SBT14
GDT090-4*
17-1/2"
16"
SBT17
GDT115-5*
21"
19-1/2"
SBT21
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
Sides
Rear
Front*
1
0
3
Vent**
SW
6
B
1
Top
1
*36" clearance for serviceability recommended.
**Single Wall Vent (SW) to be used only as a connector. Refer to the venting
tables outlined in the Installation Manual for additional venting requirements.
25
GMP
DIMENSIONS
A
51.43
1.91
43.50
1.91
B
12.38 (TYP)
1.91
1.91
10.00
1.91
7.94
20.16
13.18
11.59
31.27
99.06
10.16
10.16
38
25.88
25.88
`
3.49
58.42
71.12
Model Number
A
B
Non Combustible
Floor Base
GMP050-32
GMP075-32
14"
12-1/2"
SBM14
GMP100-42
17-1/2"
16"
SBM17
GMP125-52
21.0"
19.5"
SBGM21
GMP150-52
25
23
SBM24
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS (INCHES)
Sides
Rear
Front*
1
0
3
Vent**
SW
6
B
1
Top
Horizontal Upflow
8
*36" clearance for serviceability recommended.
**Single Wall Vent (SW) to be used only as a connector. Refer to the venting tables
outlined in the Installation Manual for additional venting requirements.
26
1
DIMENSIONS
GMPE
20 1/4"
3/4"
45º
4 7/8"
(TYP)
A
3/4"
17 1/8"
3/4"
3/4"
B
3 15/16"
(TYP)
3/4"
3 1/8"
7 15/16"
5 3/16"
4 9/16"
12 5/16"
39"
4"
4"
15"
10 3/16"
10 3/16"
23"
C
1 3/8" (TYP)
28"
Model Number
A
B
C
Non Combustible
Floor Base
GMPE075-3
17.5"
16.0"
16.0"
SBM17
GMPE100-4
GMPE125-5
21.0"
19.5"
19.5"
SBM21
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
Sides
Rear
Front*
1
0
3
Vent**
SW
6
B
1
Top
1
*36" clearance for serviceability recommended.
**Single Wall Vent (SW) to be used only as a connector. Refer to the venting
tables outlined in the Installation Manual for additional venting requirements.
27
MAINTENANCE
8. Remove the vent from the furnace venter blower.
9. Remove the venter blower and collector box.
10. With a stiff wire brush on a flexible handle and remove
any loose scale from the heat exchanger at both the
flue and burner openings.
11. With a vacuum remove any loose scale dislodged and
any additional debris found in the heat exchanger.
MAIN BURNER ADJUSTMENT
1. The main burners should not need adjustment in most
instances. However, burner air shutters on some models are provided should adjustment be necessary. After
the furnace has been in operation for at least five (5)
minutes loosen the air shutter locking screws and close
the shutter until yellow tipped flames appear. Slowly open
the shutter until the yellow disappears. Retighten the
locking screw.
MOTOR LUBRICATION AND MAINTENANCE
12. Visually inspect the heat exchanger cells for any failures using a bright light. If any failures are discovered it is important to disable the furnace and notify the end user that it remains inoperable until
repairs are implemented.
13. Reassemble the furnace in the reverse order. Note: No
additional screws or wires are supplied. All components
must be reassembled to avoid an unsafe condition.
14. Reconnect gas supply and check for leaks using a soap
solution. If a flexible gas line is used examine it for cracks
or weakness. Replace if necessary.
1. The circulating air blower is equipped with bearings that
are permanently lubricated by the motor manufacturer
and require no lubrication. At the time of the monthly
filter inspection clean the exterior of the circulating motor, especially around the perimeter air holes to prevent
the possibility of overheating due to an accumulation of
dust or dirt on the windings and motor casing. Dirty filters will restrict the air flow over the motor windings and
possibly cause an overheating condition.
15. Restore electrical power.
2. The induced draft vent motors are prelubricated by the
motor manufacturer and require no attention.
AIR FILTERS
16. Follow the lighting instructions to place the furnace into
operation.
INSPECTING / CLEANING HEAT EXCHANGERS
NOTE: It is the obligation of the installer to advise the user
to have the furnace inspected and cleaned annually. To clean
the heat exchanger perform the following:
1. Adjust the room thermostat to its lowest setting.
2. Turn off the gas and electric supply to the furnace.
1. Prior to inspecting air filters, turn off the electric supply
to the appliance. Instructions for replacing filters can be
found in the Installation and Operating Instructions. Do
not operate the furnace without air filters in place.
2. Inspect filters monthly. Failure to change air filters regularly can result in permanent damage to the circulating
blower motor and adversely effect the furnace performance.
3
Remove the access control door.
4. Disconnect the gas supply line attached to the gas valve.
5. Remove the wire connected to the gas valve.
6. Remove the burner box assembly. Care must be exercised to avoid damage to any components.
7. Inshot burners should not require cleaning. However, if
they exhibit signs of corrosion they can be cleaned by
brushing with a stiff wire brush.
28
MAINTENANCE
IGNITION SYSTEM
DRAIN SYSTEM (Condensing Furnaces Only)
1. Inspect the drain system during the normal monthly filter change. Any blockages should be corrected to insure proper operation of the furnace.
GENERAL FURNACE INSPECTION
1. Integrated control boards are not field servicable.
The preceding sections cover specific areas of maintenance;
however, on a regular basis the following should be inspected:
2. Check for tight wire connections on the integrated control board.
1. Return air connection(s) must be sealed to the furnace
and terminate outside the furnace room.
3. Turn off electrical power to furnace before tightening any
electrical connections.
2. The return air plenum(s) must be free of holes or other
openings and show no signs of distortion.
VENT AND COMBUSTION AIR INSPECTION
1. Check that the vent and vent connector are securely
attached to the furnace and show no signs of deterioration or sagging.
3. The seal between the furnace and the base or flooring to
which the furnace is mounted should show no signs of
deterioration, sags, cracks or gaps and must provide a
definite seal between the base or flooring and the furnace.
2. Check for leaks around the fittings or joints.
3. Check for proper vent pipe clearance from combustible
materials. Check vent pipe for proper venting to the outside of the structure. Follow all local code requirements
for proper vent piping, termination and required clearances.
29
SERVICING
1
0
9
9
2
8
3
7 7
4
5
1 Million
8
2
5
4
2
7 7
3
6
10 Thousand
6
5
4
1 Thousand
CUBIC
FEET
One
Foot
Foot
5
1
8
8
4
100 Thousand
Quarter
9
9
2
3 3
6
6
0
1
1
GAS RATE -- CUBIC FEET PER HOUR
30
Seconds
for One
Revolution
1/4
cu/ft
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
90
82
75
69
64
60
56
53
50
47
45
43
41
39
37
36
34
33
32
31
30
-28
-26
--
Size of Test Dial
1/2
1
2
cu/ft
cu/ft
cu/ft
5
cu/ft
Seconds
for One
Revolution
1/4
cu/ft
180
164
150
138
129
120
113
106
100
95
90
86
82
78
75
72
69
67
64
62
60
-56
-53
--
1800
1636
1500
1385
1286
1200
1125
1059
1000
947
900
857
818
783
750
720
692
667
643
621
600
581
563
545
529
514
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
25
-23
-22
-21
--20
-19
--18
--17
--16
---15
360
327
300
277
257
240
225
212
200
189
180
171
164
157
150
144
138
133
129
124
120
116
113
109
106
103
720
655
600
555
514
480
450
424
400
379
360
343
327
313
300
288
277
265
257
248
240
232
225
218
212
206
Size of Test Dial
1/2
1
2
cu/ft
cu/ft
cu/ft
50
-47
-45
-43
-41
40
-38
--36
--34
--32
-31
-30
100
97
95
92
90
-86
-82
80
78
76
75
-72
-69
-67
-64
-62
-60
200
195
189
185
180
176
172
167
164
160
157
153
150
147
144
141
138
136
133
131
129
126
124
122
120
5
cu/ft
500
486
474
462
450
439
429
419
409
400
391
383
375
367
360
355
346
340
333
327
321
316
310
305
300
SERVICING
GAS HEATING - SERVICE ANALYSIS GUIDE
Power Failure
Blown Fuse
Loose Connection
Shorted or Broken Wires
No Low Voltage
Faulty Thermostat
Faulty Transformer
•
•
•
•
•
•
•
Faulty Flame Sensor
Faulty Ignition Control
Gas Valve or Gas Supply Shut Off
Faulty Induced Draft Blower
Broken or Shorted Ignitor
Dirty Flame Sensor, Low uA
Flame Sensor not in Flame, Low uA
Faulty Gas Valve
Open Auxiliary Limit
Improper Air Flow or Distribution
Cycling on Limit
•
•
•
Flashback
Gas Pressure
Cracked Heat Exchanger
Stuck Gas Valve
Furnace Undersized
Faulty Pressure Switch
Blocked or Restricted Flue
Open Roll Out Switch
Bouncing On Pressure Switch
•
•
• • •
• •
•
• •
• •
S-4
Check Wiring
S-2
Check Wiring
S-3
Check Transformer
S-4
Check Thermostat
S-3
Check Transformer
S-4
Measure Ground Resistance
S-13
Adjust Heat Anticipator Setting
S-3
Relocate Thermostat
Test Flame Sensor
•
•
•
•
•
•
• • •
• • •
•
• •
•
•
S-1
Test Voltage
Test Control
•
See Service Procedure Reference
Not Enough Heat
Too Much Heat
Soot and /or Fumes
•
• •
• •
•
• •
•
•
•
•
•
•
• •
•
• •
Delayed Ignition
Orifice Size
Long Cycles
• •
Improper Heat Anticipator Setting
Faulty Limit or Roll Out Switch
Test Method
Remedy
Test Voltage
Poor or High Resistance Ground
Improper Thermostat Location
Short Cycles
Unsatisfactory Heat
Burner Shuts Off prior to T'Stat being Satisfied
Burner Won't Ignite
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
SYMPTOM
POSSIBLE CAUSE
Burner Ignites-Locks Out
No Heat
System Will Not Start
Complaint
S-5 & 7
S-14
Test Control
S-13
Turn Valves to On Position
S-11
Test Blower
S-9
Test Ignitor
S-12
Clean Flame Sensor
S-14
Test/Adjust Position of Flame Sensor
S-14
Replace Gas Valve
S-11
Reset Control
S-6
Check Duct Static
S-21
Check Controls & Temperature Rise
S-5 & 22
Test for Delayed Ignition
S-19
Test for Flashback
S-20
Check Orifices
S-16
Check Gas Pressure
S-18
Check Burner Flames
S-15
Replace Gas Valve
S-11
Replace with Proper Size Furnace
Test Pressure Switch
S-8
Check Flue/Drawdown Pressure
S-8
Test Control
S-7
Test Negative Pressure
S-8
31
SERVICING
SERVICING SECTION INDEX
32
S-1
Checking Voltage ......................................................................................................... 33
S-2
Checking Wiring ........................................................................................................... 33
S-3A
Thermostat and Wiring ................................................................................................ 33
S-3B
Heating Anticipator ....................................................................................................... 34
S-3C
Cooling Anticipator ....................................................................................................... 34
S-4
Checking Transformer and Control Circuit .................................................................. 34
S-5
Checking Primary Limit Control ................................................................................... 37
S-6
Checking Auxiliary Limit Control ................................................................................... 38
S-7
Checking Flame Rollout Control .................................................................................. 39
S-8
Checking Pressure Control .......................................................................................... 41
S-9
Checking Air Circulator Blower Motor or Induced Draft Blower Motor .......................... 44
S-9A
Checking Variable Speed Air Circulator Blower Motor.................................................. 44
S-10
Checking Capacitor ...................................................................................................... 48
S-10A
Resistance Check ........................................................................................................ 49
S-11
Checking Gas Valve ..................................................................................................... 49
S-12
Checking Hot Surface Ignitor ........................................................................................ 50
S-13
Checking Integrated Ignition Controls ........................................................................... 50
S-14
Checking Flame Sensor............................................................................................... 56
S-15
Checking Main Burners ................................................................................................ 57
SERVICING
S-1 CHECKING VOLTAGE
2. Using an ohmmeter to check continuity of any suspected
open wires.
3. If any wires must be replaced, replace with AWM, 105°C.
4/64 thick insulation of the same gauge or its equivalent.
S-3 CHECKING THERMOSTAT, WIRING AND
ANTICIPATOR
S-3A Thermostat and Wiring
1. Remove the burner door on 80% furnace or blower compartment door on 90% furnace to gain entry to Junction
Box.
2. Remove cover from Junction Box and gain access to
incoming power lines.
With Power ON:
1. Remove the blower compartment door to gain access to
the thermostat low voltage wires located at the furnace
integrated control module terminals.
2. Remove the thermostat low voltage wires at the furnace
control panel terminal board.
3. Jumper terminals R to W (W1 and W2) on the integrated
ignition control.
3. Using a voltmeter, measure the voltage across the hot
and neutral connections.
With Power On (and Door Interlock Switch closed):
NOTE: To energize the furnace, the Door Interlock Switch
must be engaged at this point.
4. No reading - indicates open wiring, open fuse, no power,
or etc. from unit to fused disconnect service. Repair as
needed.
5. With ample voltage at line voltage connectors, energize
the furnace blower motor by jumpering terminals R to G
on the integrated ignition control.
6. With the blower motor in operation, the voltage should
be 115 volts ± 10 percent.
7. If the reading falls below the minimum voltage, check
the line wire size. Long runs of undersized wire can cause
low voltage. If wire size is adequate, notify the local power
company of the condition.
4. Induced Draft Motor must run and pull in pressure switch.
5. If the hot surface ignitor heats and at the end of the this
ignitor warm-up period the gas valve opens and the burners ignite, the trouble is in the thermostat or wiring.
6. With power off, check the continuity of the thermostat
and wiring. Repair or replace as necessary.
If checking the furnace in the air conditioning mode, proceed as follows.
7. With power off, Jumper terminals R to Y to G.
8. Turn on the power.
8. After completing check and/or repair, replace Junction
Box cover and reinstall burner compartment door on 80%
or blower compartment door on 90% furnace.
9. If the furnace blower motor starts and the condensing
unit runs, then the trouble is in the thermostat or wiring.
Repair or replace as necessary.
9. Turn on electrical power and verify proper unit operation.
10. After completing check and/or repair of wiring and check
and/or replacement of thermostat, reinstall blower compartment door.
S-2 CHECKING WIRING
11. Turn on electrical power and verify proper unit operation.
S-3B Heating Anticipator
The heating anticipator is a wire wound adjustable heater
which is energized during the "ON" cycle to help prevent
overheating of the conditioned space.
1. Check wiring visually for signs of overheating, damaged
insulations and loose connections.
The anticipator is a part of the thermostat and if it should fail
for any reason, the thermostat must be replaced.
33
SERVICING
The heating anticipator setting for furnaces covered in this
manual is 0.70 Amps.
If the anticipator current draw is unknown, then an amp draw
should be taken to determine the anticipator setting. Use
an amprobe as shown in the following drawing.
10 TURNS OF
THERMOSTAT WIRE
(From "W" on thermostat)
STATIONARY JAW
OF AMPROBE
With Power On (and Door Interlock Switch closed):
5. Check transformer primary voltage at incoming line voltage connections, fuse, splices, and blower door interlock switch.
6. If line voltage is available to the primary side of transformer and not at secondary side, the transformer is
inoperative. Replace.
7. After completing check and/or replacement of transformer and check and/or repair of control circuit, reinstall blower compartment door.
8. Turn on electrical power and verify proper unit operation.
S-5 CHECKING PRIMARY LIMIT CONTROL
READS 4 AMPS
CURRENT DRAW
WOULD BE .4 AMPS
The 80% furnaces use nonadjustable, automatic reset, primary limits part # B13701(87-99) and B13709*. The illustration below shows how to test limit controls. See the following note BEFORE replacing the limit control.
NOTE: The following service problems could cause the primary limit to open up and should be checked first:
Checking Heating Anticipator Current (Amp) Draw
S-3C Cooling Anticipator
The cooling anticipator is a small heater (resistor) in the
thermostat. During the "OFF" cycle it heats the bimetal element helping the thermostat call for the next cooling cycle.
This prevents the room temperature from rising too high before the system is restarted. A properly sized anticipator
should maintain room temperature within 1 1/2 to 2 degrees
range.
The anticipator is fixed in the subbase and is not to be replaced. If the anticipator should fail for any reason, the subbase must be changed.
S-4 CHECKING TRANSFORMER AND CONTROL CIRCUIT
A step-down transformer 120 volt primary to 24 volt secondary, 40 VA (Heating and Cooling Models) supplies ample
capacity of power for either operation.
1. Low air flow. Check for dirty evaporator coil, dirty
blower wheel, blower motor not running or turning too
slow, high duct static pressure (duct system undersized), high static air filters, return air duct or return grilles
undersized.
1. Remove burner compartment door to gain access to the
primary limit.
2. Remove low voltage wires at limit control terminals.
3. With an ohmmeter, test between these two terminals
as shown in the following drawing. Should read continuous unless heat exchanger temperature is above limit
control setting. If not as above, replace the control.
VOLT / OH M
METER
1. Remove blower compartment door to gain access to the
thermostat low voltage wires located at the furnace integrated control module.
2. Remove the thermostat low voltage wires at the furnace
integrated control module terminals.
34
SERVICING
4. After completing check and/or replacement of primary
limit control, reinstall burner compartment door.
5. Turn on electrical power and verify proper unit operation.
As shown in the following drawing, limit control should read
continuous unless the heat exchanger temperature is above
limit control setting. If not as above, replace the control
Volt / Ohm
Meter
VOLT / OHM
METER
COLOR
IDENTIFYING
SLEEVES
COLOR
IDENTIFYING
TAB
Testing Primary Limit Control
(GMNT, GMT Furnaces)
Testing Primary Limit Control
6. After completing check and/or replacement of primary
limit control, reinstall burner compartment door.
(GMP, GMPN Furnaces)
7. Turn on electrical power and verify proper unit operation.
To aid in identifying these controls, refer to the following
Primary Limit Charts for temperature setting and length specifications.
35
SERVICING
80% Primary Limit
( GDT - GMT - GMTH )
Part Number
B1370187
B1370190
B1370191
B1370192
B1370193
B1370194
b1370195
B1370196
B1370919
B1370920
B1370921
Open Setting °F
160
210
220
230
240
250
300
320
170 F
180 F
240 F
Length (Inches)
3"
3"
3"
3"
3"
3"
3"
3"
7"
7"
7"
GDT 045-3*
---
---
---
---
---
---
1
---
---
---
---
GDT 070-3*
---
---
---
---
1
---
---
---
---
---
---
GDT 090-4*
---
---
---
---
---
1
---
---
---
---
---
GDT 115-5*
---
---
1
---
---
---
---
---
---
---
---
GMT 045-3*
---
---
---
---
---
---
1
---
---
---
---
GMT 070-3*
---
---
---
---
---
---
---
---
1
---
GMT 070-4*
---
---
---
---
---
---
---
---
1
---
---
GMT 090-3*
---
1
---
---
---
---
---
---
---
---
---
GMT 090-4*
---
1
---
---
---
---
---
---
---
---
---
GMT 090-5*
---
---
---
---
---
---
---
1
---
---
---
GMT 115-5*
---
---
1
---
---
---
---
---
---
---
---
GMT 135-5*
1
---
---
---
---
---
---
---
---
---
---
GMT 140-5*
1
---
---
---
---
---
---
---
---
---
---
GMTH 045-3*
---
---
---
1
---
---
---
---
---
---
---
GMTH 070-4*
---
---
---
---
---
---
---
---
---
---
1
GMTH 090-5*
---
---
---
---
1
---
---
---
---
---
---
GMTH 115-5*
---
---
---
---
---
---
1
---
---
---
---
80% Primary Limit
( GMP - GMPE - GMPH - GPD )
Part Number
B1370902
B1370903
B1370905
B1370908
B1370910
B1370911
B1370912
B1370914
B1370915
Open Setting °F
210
240
290
160
170
220
240
220
230
Length (Inches)
3"
3"
3"
7"
7"
3"
7"
7"
3"
GMP 050-3*
---
---
---
---
---
---
1
---
---
---
---
---
GMP 075-3*
---
---
---
1
---
---
GMP 075-4*
---
---
---
---
---
1
GMP 100-3*
---
---
1
---
---
---
---
---
---
GMP 100-4*
---
---
1
---
---
---
---
---
---
1
---
---
---
---
---
---
---
GMP 125-4*
1
---
---
---
---
---
---
---
---
GMP 125-5*
---
---
---
---
---
---
1
---
---
GMP 150-5*
---
---
---
---
---
---
---
1
---
GMPE 075-3*
---
---
---
---
1
---
---
---
---
GMP 100-5*
GMPE 100-4*
---
---
---
---
---
---
1
---
---
GMPE 125-5
---
---
---
1
---
---
---
---
---
GMPH 050-3*
---
1
---
---
---
---
---
---
---
GMPH 075-3*
---
1
---
---
---
---
---
---
---
GMPH 080-5*
---
---
---
---
1
---
---
---
---
GMPH 120-5*
---
---
---
---
---
---
---
1
---
GPD 050-3*
---
---
---
---
---
---
1
---
---
GPD 075-3*
1
---
---
---
---
---
---
---
---
GPD 100-4*
---
---
---
---
---
---
---
---
1
GPD 125-4*
---
---
---
---
---
1
---
---
---
36
SERVICING
90% Primary Limit
Part Number
B1370187
B1370188
B1370189
B1370190
B1370906
B1370908
B1370909
B1370910
Open Setting °F
160
170
200
210
150
160
160
170
Length (Inches)
3"
3"
3"
3"
7"
7"
3"
7"
GMPN 040-3*
---
---
---
---
1
---
---
---
GMPN 060-3*
---
---
---
---
---
1
---
---
GMPN 080-4*
---
---
---
---
---
1
---
---
GMPN 100-4*
---
---
---
---
---
---
---
1
GMPN 120-5*
---
---
---
---
---
1
---
---
GSM 060-3
---
---
---
---
---
---
1
---
GSM 080-4
---
---
---
---
---
1
---
---
GSM 100-4
---
---
---
---
---
---
---
1
GSMS 060-3
---
---
---
---
---
---
1
---
GSMS 080-3
---
---
---
---
---
1
---
---
GSMS 100-4
---
---
---
---
---
---
---
1
GMNT 040-3*
---
1
---
---
---
---
---
---
GMNT 060-3*
1
---
---
---
---
---
---
---
GMNT 080-4*
---
---
1
---
---
---
---
---
GMNT 100-4*
---
1
---
---
---
---
---
---
GMNT 120-5*
---
1
---
---
---
---
---
---
GMNTE 060-3*
---
1
---
---
---
---
---
---
GMNTE 080-4*
---
1
---
---
---
---
---
---
GMNTE 100-4*
---
---
---
1
---
---
---
---
GMNTE 120-5*
---
---
---
1
---
---
---
---
37
SERVICING
S-6 CHECKING AUXILIARY LIMIT CONTROL
The auxiliary limit switch (B13701-55) is a safety control
that senses high temperature within the furnace or duct work.
This control is preset to open at 120°F and close at 90°F. It
is not adjustable and automatically resets. The control is
located in the blower compartment of the furnace on the
blower housing. Auxiliary limits may be on the side or front
of the blower housing.
90% Auxiliary Limit
Part Number
Open Setting °F
GMPN 040-3*
GMPN 060-3*
GMPN 080-4*
GMPN 100-4*
GMPN 120-5*
B13701-55
120
NA
NA
NA
NA
NA
80% Auxiliary Limit
Part Number
Open Setting °F
GDT 045-3*
GDT 070-3*
GDT 090-4*
GDT 115-5*
GMP 050-3*
GMP 075-3*
GMP 075-4*
GMP 100-3*
GMP 100-4*
GMP 100-5*
GMP 125-4*
GMP 125-5*
GMP 150-5*
1
1
1
1
1
1
1
1
1
GMPE 075-3*
GMPE 100-4*
GMPE 125-5*
1
1
1
GMPH
GMPH
GMPH
GMPH
1
1
1
1
GMT
GMT
GMT
GMT
GMT
GMT
GMT
GMT
GMT
38
B13701-55
120
1
1
1
1
050-3*
075-3*
080-5*
120-5*
045-3*
070-3*
070-4*
090-3*
090-4*
090 -5*
115-5*
135-5*
140-5*
1
1
1
1
1
1
1
1
1
GMTH 045-3*
GMTH 070-4*
GMTH 090-5*
GMTH115-5*
1
1
1
1
GPD
GPD
GPD
GPD
1
1
1
1
050-3*
075-3*
100-4*
125-4*
GSM 060-3
GSM 080-4
GSM 100-4
NA
NA
NA
GSMS 060-3
GSMS 080-3
GSMS 100-4
NA
NA
NA
GMNT 040-3*
GMNT 060-3*
GMNT 080-4*
GMNT 100-4*
GMNT 120-5*
1
1
1
1
1
GMNTE 060-3*
GMNTE 080-4*
GMNTE 100-4*
GMNTE 120-5*
1
1
1
1
AUXILIARY LIMIT
CONTROL
BLOWER HOUSING
AUXILIARY LIMIT
CONTROL
Auxiliary Limit Control Location
(Side location shown)
GMP furnace with the edge card control board is connected
in series with the primary limit which connects to the integrated ignition control. Interruption of the circuit will cause a
(4) flash code on the control board. These symptoms are
identical to a trip of the primary limit control. The air circulation blower will run continuously.
SERVICING
GDP, GDT, GMP, GMPE, GMNT, GMT, GMTH and GPD
furnaces using the 9-pin connector on the control board is
connected in series through the rollout switches. Interruption of the circuit will cause a (1) flash code of ignition
failure. If its temperature should be exceeded, it will open,
interrupting the voltage to the gas valve causing it to close.
The auxiliary limit control is designed to prevent furnace
operation in case of main blower failure. It may also open
if the power supply is interrupted while the furnace is firing.
ROLLOUT
SWITCH
Flame Rollout Switch Location
(80% Upflow Furnace Shown, Downflow Similar)
1. Remove blower compartment door to gain access to
the auxiliary limit control which is located on the blower
housing or on the blower deck.
2. Remove the wires from the auxiliary limit control terminals.
3. Use an ohmmeter, test for continuity across the two
terminals (refer to the following auxiliary limit control
figure). No reading indicates the control is open.
4.
Verify proper operation of blower motor and static
pressure of duct system. Problem could be caused
by a dirty evaporator coil.
The control is designed to open should a flame roll out occur.
An over firing condition or flame impingement on the heat
shield may also cause the control to open.
On some models the ignition control diagnostic light will flash
(1) one time indicating a trip of the rollout switch. These symptoms are identical to a trip of the auxiliary limit control.
On other models the ignition controls diagnostic light will flash
(4) four times indicating an open primary limit, rollout switch,
auxiliary switch or stack overtemp switch open. Check the
flash codes for the model you are working on.
The circuit between the ignition control and gas valve will be
interrupted when the rollout switch opens up.
Refer to the Rollout Limit Charts on the next page for temperature settings and part numbers.
V OLT / OH M
M ETE R
1. Remove the burner compartment door to gain access to
the rollout switch(es) mounted to burner bracket.
Testing Auxiliary Limit Control
S-7 CHECKING FLAME ROLLOUT CONTROL
A temperature activated manual reset control is mounted
to the manifold assembly as shown in the following illustration. Locations of the rollout switch may vary.
The servicer should reset the ignition control by opening and
closing the thermostat circuit. Then look for the ignitor glowing which indicates there is power to the ignition control.
Measure the voltage between each side of the rollout control
and ground while the ignition control tries to power the gas
valve.
2. Measure the voltage between each side of the rollout control and ground during the ignition attempt. Refer to the
following figure.
39
SERVICING
80% Rollout Limit
VOLT / OHM
METER
ND
G
RED
RESET
BUTTON
COLOR
IDENTIFYING
TAB
Checking Flame Rollout Switch
( 80% & 90% Furnaces )
a. If no voltage is measured on either side of control it
indicates ignition control or wiring to control problem.
b. If voltage is measured on one side of the control and
not the other it indicates the control is open.
c. If voltage is measured on both sides of the control the
wiring to gas valve or valve is a fault.
3. After check and/or replacement of rollout switch, reinstall burner compartment door and verify proper unit operation.
40
Part Number
Open Setting °F
GDT 045-3*
GDT 070-3*
GDT 090-4*
GDT 115-5*
B13701-45
300
1
1
1
1
B1370154
350 F
---------
GMP 050-3*
GMP 075-3*
GMP 075-4*
GMP 100-3*
GMP 100-4*
GMP 100-5*
GMP 125-4*
GMP 125-5*
GMP 150-5*
-------------------
4
4
4
4
4
4
4
4
4
GMPE 075-3*
GMPE 100-4*
GMPE 125-5*
-------
4
4
4
GMPH 050-3*
GMPH 075-3*
GMPH 080-5*
GMPH 120-5*
---------
4
4
4
4
GMT 045-3*
GMT 070-3*
GMT 070-4*
GMT 090-3*
GMT 090-4*
GMT 090-5*
GMT 115-5*
GMT 135-5*
GMT 140-5*
2
2
2
2
2
2
2
2
2
-------------------
GMTH 045-3*
GMTH 070-4*
GMTH 090-5*
GMTH 115-5*
2
2
2
2
---------
GPD 050-3*
GPD 075-3*
GPD 100-4*
GPD 125-4*
---------
1
1
1
1
SERVICING
90% Rollout Limit
Part Number
Open Setting °F
GMPN 040-3*
GMPN 060-3*
GMPN 080-4*
GMPN 100-4*
GMPN 120-5*
B13701-45
300
4
4
4
4
4
B1370154
350 F
-----------
GSM 060-3
GSM 080-3
GSM 100-4
-------
2
2
2
GSMS 060-3
GSMS 080-4
GSMS 100-4
-------
2
2
2
INDUCED DRAFT BLOWER
PRESSURE SWITCH
PRESSURE SWITCH
HOSE
OPEN TO
ATMOSPHERE
1/4" TEE
INCLINED MANOMETER
HOSE TO INDUCED
DRAFT BLOWER TAP
INDUCED
DRAFT
BLOWER
ID Blower Pressure Switch
Negative Pressure Measurement
(80% Furnace shown for illustration purposes)
INDUCED DRAFT BLOWER
PRESSURE SWITCH
GMNT 040-3*
GMNT 060-3*
GMNT 080-4*
GMNT 100-4*
GMNT 120-5*
4
4
4
4
4
-----------
GMNTE 060-3*
GMNTE 080-4*
GMNTE 100-4*
GMNTE 120-5*
4
4
--4
----4
---
PRESSURE SWITCH
HOSE
OPEN TO
*
*
ATMOSPHERE
*
M
1
P
3
O
F
F
*
C
2
ON
*
*
*
1/4" TEE
COIL COVER
PRESSURE SWITCH
INCLINED MANOMETER
INDUCED
DRAFT
BLOWER
HOSE TO INDUCED
DRAFT BLOWER TAP
ID Blower Pressure Switch
Negative Pressure Measurement
S-8 CHECKING PRESSURE CONTROL
The pressure control is a safety device to prevent the combustion cycle from occurring with inadequate venting caused
by a restricted or blocked vent pipe on the 80% and 90%
furnaces.
(90% Furnace shown for illustration purposes)
Reconnect pressure switch electrical wires.
4. Energize furnace for heating cycle. The induced draft
blower motor will begin to run. The inclined manometer
should read a negative pressure.
1. Remove burner compartment door to gain access to pressure switch(es).
2. Remove wires from the pressure switch(es) electrical
terminals.
3. Using a VOM check from common terminal to NC (Normally Closed) - should read closed. Check from Common to NO (Normally Open) - should read open.
5. Remove and check the two electrical wires and using
the VOM check from Common to NC (Normally Closed)
- should read open. Check from Common to NO (Normally Open) - should read closed. If not as above, replace control.
6. Reconnect wires to the control and place in a heating
cycle.
NOTE: See the following pages for the pressure switch trip
points and usage charts.
If switch reads as above proceed to Step 4, otherwise replace control.
4. Remove the pressure control hose from the control and
interconnect with an inclined manometer as shown in
the following figures.
41
SERVICING
PRESSURE SWITCH TRIP POINTS AND USAGE CHART
Trip Point
Inches Water Column (" w.c.)
MODEL
0 to 8,000 ft.
Low Fire
Negative Pressure
Part #
High Fire
Negative Pressure
Part #
GSM 060-3
-0.38
B13701-57
-1.40
B13701-56
GSM 080-4
GSM 100-4
-0.38
B13701-57
-1.10
B13701-59
PRESSURE SWITCH TRIP POINTS AND USAGE CHART
Trip Point
Inches Water Column (" w.c.)
MODEL
0 to 8,000 ft.
Low Fire
Negative Pressure
High Fire
Negative Pressure
Part #
GMNTE 060-3*
-0.60
-1.25
B13702-01
GMNTE 080-4*
-0.55
-0.95
B13702-04
GMNTE 100-4*
-0.35
-0.85
B13702-02
GMNTE 120-5*
-0.40
-0.75
B13702-03
PRESSURE SWITCH TRIP POINTS
AND USAGE CHART
Trip Point
Inches Water Column (" w.c.)
MODEL
42
0 to 8,000 ft.
Negative Pressure
Part #
GMT/GMTH/GDT 045-3*
GMT/GMTH/GDT 070-3*
GMT 070-4*
GMT 090-3*
GMT/GDT 090-4*
-0.60
B13701-42
GMT/GMTH 090-5*
GMT/GDT 115-5*
-0.70
B13701-58
GMTH 115-5*
-0.85
B13701-50
GMT 140-5*
-0.75
B13701-79
SERVICING
PRESSURE SWITCH TRIP POINTS
AND USAGE CHART
Trip Point
Inches Water Column (" w.c.)
MODEL
0 to 8,000 ft.
Negative Pressure
Part #
GSMS 060-3 / 080-4 / 100-4
-0.38
B13701-57
GMPN/GMNT 040-3*
GMPN 060-3*
-1.19
B13701-48
GMNT 060-3*
GMPN 080-4*
GMPN/GMNT 100-4*
GMPN 120-5*
-0.85
B13701-50
GMNT 080-4*
-1.10
B13701-59
GMNT 120-5*
-0.75
B13701-79
PRESSURE SWITCH TRIP POINTS
AND USAGE CHART
Trip Point
Inches Water Column (" w.c.)
MODEL
0 to 8,000 ft.
Negative Pressure
Part #
GMP/GMPH/GPD 050-3*
GMPH 080-5
GMP 100-3*
GMP/GMPE/GPD 100-4*
GMP 100-5*
GMPH 120-5*
GMP/GPD 125-4*
GMP/GMPE 125-5*
-0.40
B13701-26
GMP/GMPE/GPD 070-3
GMP/GMPH 075-4*
-0.35
B13701-33
GMP 150-5
-0.60
B13701-42
43
SERVICING
S-9 CHECKING AIR CIRCULATOR BLOWER
MOTOR OR INDUCED DRAFT BLOWER
MOTOR
ECM/ICM Control Connections
1. Remove blower compartment door to gain access to the
circulator blower motor and induced draft blower motor
wire leads connected at integrated ignition control.
The ECM control interface can be as simple as a direct
connection to the thermostat. For example: "R" to "G" will
cause the fan to come at "Fan-Only" CFM, "R" to "G" to "Y"
will cause the fan to come on at Cooling speed and R to G
to W will cause the fan to come on at heating speed. The
ECM/ICM control requires a common connection from the
transformer (transformer common to C1, C2 on control). In
typical applications C1 and C2 will be tied together.
2. Disconnect the motor wire leads from its connection point
at integrated ignition control module and capacitor if applicable.
3. Using and ohmmeter, test for continuity between each
of the motor leads.
4. Touch one probe of the ohmmeter to the motor frame
(ground) and the other probe in turn to each lead.
If the windings do not test continuous or a reading is obtained to ground, replace the motor.
5. After completing check and/or replacement of circulator
blower motor or induced draft blower motor, reinstall
blower compartment door.
6. Turn on electrical power and verify proper unit operation.
Control functions (G, Y, W, W1, W2) may be active at less
than 1/2 control voltage. (i.e. 12 volts). Relay contacts on
control functions must reliably switch low currents (less than
5 MA). Some thermostats (with triac switches) and Solid
State Relays may allow enough "leakage" current to turn
on "G". Thermostats that "steal" power thru "Y" or other
functions are not compatible.
Checking ECM/ICM Motors
ECM/ICM motors connect directly to the AC Line Voltage.
DO NOT insert contactors in series with the ECM/ICM Motor AC Line. The control is powered continuously to insure
reliable start-up. The connector plug is polarized, verify and
reverify correct connector orientation before applying power.
DO NOT force plug into motor and make sure power is off
before inserting power connector. DO NOT apply voltage to
terminals 1 or 2.
S-9A CHECKING VARIABLE SPEED AIR CIRCULATOR BLOWER MOTOR
Variable Speed furnaces incorporate the GE© ICM or variable speed blower motors for greater efficiency. ECM/ICM
motors vary the motor RPMs to provide a set volume of air
over a wide range of conditions. These motors use an electronic control module attached to the motors end bell to
control motor operation. Some unique features of these
motors are:
1. Constant Airflow. These motors will maintain constant
airflow in excess of .80 static. In other words, as the
static increases so does the motors RPM so that a constant CFM is maintained.
NOTE: The motor in these units will move more air under
higher static conditions than a similar sized unit using a
PSC motor. Because this motor does not load up and reduce airflow like a PSC motor, in some undersized duct
installations this may cause noise or high airflow complaints.
2. Ramp-up/Ramp-down feature. These motors ramp up
and down at the beginning or end of a cycle to reduce
air rush noise.
3. High voltage is present at these motors all the time.
Motor operation is controlled through the low voltage
motor interface board.
44
Check for line voltage on terminals 4 and 5. Verify terminal
3 is ground. terminals. Terminals 1 and 2 are jumpered in
the harness for 120VAC operation.
5
AC Line Hot Connection
4
AC Line Neutral Connection
3
Gnd
2
1
}
Lines 1 and 2 will be connected
for 120VAC Power Connector
applications only
POWER CONNECTOR
(1/2 HP MOTORS)
"Motor Half“
(Viewed from Plug End)
SERVICING
inductor
AC Line Hot Connection
5
4
AC Line Neutral Connection
3
Gnd
2
1
}
Lines 1 and 2 will be connected
for 120VAC Power Connector
applications only
POWER CONNECTOR
(3/4 & 1 HP MOTORS)
"Motor Half“
(Viewed from Plug End)
OUT -
8
16
OUT +
ADJUST +/-
7
15
G (fan)
Y1
6
14
Y/Y2
COOL
5
13
EM HT/W2
DELAY
4
12
24VAC (R)
COMMON 2
3
11
HEAT
W/W1
2
10
BK/Pwm (Speed)
COMMON 1
1
9
Do not apply 24 volts to terminals "Out +" or "Out -".
Make sure connector is fully seated.
Make sure pins are fully seated in connector housing.
Verify C1 and C2 are connected to transformer common.
Verify "R" is connected to transformer hot.
After verifying above connections, motor can be tested by
applying 24 volts to control pins. Example: R to G will cause
the fan to come at "Fan-Only" CFM, R to G to Y will cause
the fan to come on at cooling speed and R to G to W will
cause the fan to come on at heating speed.
If motor does not respond as noted, ICM control unit is bad
and should be replaced.
O (Rev Valve)
CONTROL CONNECTOR
"Motor Half“
(Viewed from connector end)
45
46
Check for undercharged condition.
-
Arrange harnesses with "drip loop" under motor.
-
You must use the correct replacement control motor module since they are factory programmed for specific operating modes. Even
though they look alike, different modules may have completely different functionality. The ECM variable speed motors are currently the only
motors that can have the motor/control module replaced.
- Turn power OFF prior to repair.
- Turn power OFF prior to repair.
----
IMPORTANT NOTE: Using the wrong motor/control module voids all product warranties and may produce unexpected results.
NOTE:
THIS CHART CONTINUED ON NEXT PAGE
Check and plug leaks in return ducts, cabinet.
-
Is condensate drain plugged?
Check for low airflow (too much latent capacity).
-
- "Hunts" or "puffs" at
high CFM (speed).
Connectors are oriented "down" (or as recommended
by equipment manufacturer).
- Does removing panel or filter
reduce "puffing"?
- Check/replace filter.
- Check/correct duct restrictions.
- Adjust to correct blower speed setting.
- Incorrect or dirty filter(s).
- Incorrect supply or return ductwork.
- Incorrect blower speed setting.
- Varies up and down
or intermittent.
-
- Check line voltage for variation or "sag".
- Check low voltage connections
(G, Y, W, R, C) at
motor, unseated pins in motor
harness connectors.
- Check-out system controls - Thermostat.
- Perform Moisture Check.*
----
- Variation in 230 Vac to motor.
- Unseated pins in wiring harness
connectors.
- Erratic CFM command from
"BK" terminal.
- Improper thermostat connection or setting.
- Moisture present in motor/control module.
----
- Motor rocks,
but won't start.
- It is normal for motor to
oscillate with
no load on shaft.
- Turn power OFF prior to repair.
Wait 5 minutes after
disconnecting power before
opening motor.
- Handle electronic motor/control with care.
- Check for loose motor mount.
- Make sure blower wheel is tight on shaft.
- Perform motor/control replacement check,
ECM motors only.
- Loose motor mount.
- Blower wheel not tight on motor shaft.
- Bad motor/control module.
*MOISTURE CHECK:
- Motor starts,
but runs
erratically.
- Motor
oscillates up &
down while
being tested
off of blower.
- Motor won't
start.
- No movement.
----
- Turn power OFF prior to repair.
Wait 5 minutes after
disconnecting power before
opening motor.
- Handle electronic motor/control with care.
----
Cautions and Notes
- Check 230 Vac power at motor.
- Check low voltage (24 Vac R to C) at motor.
- Check low voltage connections
(G, Y, W, R, C) at motor.
- Check for unseated pins in connectors
on motor harness.
- Test with a temporary jumper between R - G.
-
----
Corrective Action
- Manual disconnect switch off or
door switch open.
- Blown fuse or circuit breaker.
- 24 Vac wires miswired.
- Unseated pins in wiring
harness connectors.
- Bad motor/control module.
- Moisture present in motor or control module.
- This is normal start-up for
variable speed motor.
- Motor rocks
slightly
when starting.
Possible Causes
Troubleshooting Chart for ECM Variable Speed Air Circulator Blower Motors
Fault Description(s)
Symptom
SERVICING
Check for undercharged condition.
Check and plug leaks in return ducts, cabinet.
-
Arrange harnesses with "drip loop" under motor.
-
Is condensate drain plugged?
Check for low airflow (too much latent capacity).
-
NOTE:
- Motor failure or
malfunction has
occurred and moisture
is present.
-
- Moisture in motor/control module.
- "Hunts" or "puffs" at
high CFM (speed).
Connectors are oriented "down" (or as recommended
by equipment manufacturer).
- Does removing panel or filter
reduce "puffing"?
- Check/replace filter.
- Check/correct duct restrictions.
- Adjust to correct blower speed setting.
- High static creating high blower speed.
- Incorrect or dirty filter(s).
- Incorrect supply or return ductwork.
- Incorrect blower speed setting.
- Noisy blower or cabinet.
-
- Turn power OFF prior to repair.
- Check for loose blower housing,
panels, etc.
- Check for air whistling thru seams in
ducts, cabinets or panels.
- Check for cabinet/duct deformation.
- Loose blower housing, panels, etc.
- High static creating high blower
speed.
- Air leaks in ductwork, cabinets,
or panels.
- Turn power OFF prior to repair.
Wait 5 minutes after
disconnecting power before
opening motor.
- Handle electronic motor/control
with care.
- Turn power OFF prior to repair.
IMPORTANT NOTE: Using the wrong motor/control module voids all product warranties and may produce unexpected results.
You must use the correct replacement control motor module since they are factory programmed for specific operating modes. Even
though they look alike, different modules may have completely different functionality. The ECM variable speed motors are currently the only
motors that can have the motor/control module replaced.
- Replace motor and perform
Moisture Check.*
- Turn power OFF prior to repair.
- Check/replace filter.
- Check/correct duct restrictions.
- Adjust to correct blower speed setting.
- High static creating high blower speed.
- Incorrect supply or return ductwork.
- Incorrect or dirty filter(s).
- Incorrect blower speed setting.
- Air noise.
- Turn power OFF prior to repair.
- Check for Triac switched t'stat
or solid state relay.
- Current leakage from controls
into G, Y, or W.
- Blower won't shut off.
- Turn power OFF prior to repair.
Wait 5 minutes after
disconnecting power before
opening motor.
- Handle electronic motor/control
with care.
- Turn power OFF prior to repair.
Wait 5 minutes after
disconnecting power before
opening motor.
- Handle electronic motor/control
with care.
Cautions and Notes
- "R" missing/not connected at motor.
- Fan in delay mode.
- Check low voltage (Thermostat)
wires and connections.
- Verify fan is not in delay mode wait until delay complete.
- Perform motor/control replacement
check, ECM motors only.
Corrective Action
- Stays at high CFM.
- 24 Vac wires miswired or loose.
- "R" missing/not connected at motor.
- Fan in delay mode.
Possible Causes
- Is fan in delay mode? - wait until delay time complete.
- Perform motor/control replacement check, ECM
motors only.
- Stays at low CFM despite
system call for cool
or heat CFM.
Fault Description(s)
*MOISTURE CHECK:
- Evidence of
Moisture.
- Excessive
noise.
- Motor starts,
but runs
erratically.
Symptom
Troubleshooting Chart for ECM Variable Speed Air Circulator Blower Motors
THIS CHART CONTINUED FROM PREVIOUS PAGE
SERVICING
47
SERVICING
Replacing ECM™ Control Module
Use the following steps to replace the control module for
the GE© variable speed indoor blower motor.
1. You must have the correct replacement module. The
controls are factory programmed for specific operating
modes. Even though they look alike, different modules
may have completely different functionality. Using the
wrong control module voids all product warranties and
may produce unexpected results.
2. Remove all power from the unit being serviced.
8. Install the new control module back on the motor being
careful to engage the locating pin into the appropriate
mating motor hole. Replace the two 1/4" hex head bolts.
Tighten the bolts snugly. It is not necessary to overtighten.
Note: Before replacing the blower/motor assembly, it is important to look at the installation to see if some application
fault has caused the motor to fail.
Is there any evidence of water damage to the failed control?
(Corrosion on the inside or outside of the casting.) If yes, do
moisture check.
9. Re-install the blower/motor assembly into the furnace.
10. Plug the 16-pin control plug into the motor. The plug is
keyed. Make sure the connector is properly seated and
latched.
Do NOT work on the motor with power applied. Wait at
least 5 minutes after disconnecting power from the equipment before opening the motor.
3. It is usually not necessary to remove the motor from the
blower assembly. However it is recommended that the
whole blower assembly, with the motor, be removed.
Unplug the two cable connectors to the motor. There
are latches on each connector. Do not pull on the wires.
The plugs remove easily when properly released.
4. Observe the flat end of the motor control module casting
and located the two standard ¼" hex head bolts. Remove these bolts from the motor while holding the control module. Do not remove the two torx head screws.
5. The control module is now free of the motor but still attacked by a plug and cable. Carefully rotate the control
so as to gain access to the plug on the end of the cable.
Squeeze the release latch and gently pull the plug out
of the control module. Do not pull on the wires. Grip the
plug only.
6. The control module is now completely detached from the
motor. Verify with a standard ohmmeter that the resistance from each motor lead (in the motor plug just removed) to the motor shell is greater than 100k ohms.
(Measure resistance to unpainted motor end plate). If
any motor lead fails this test do not proceed to install
the control module. The motor is defective and must be
replaced. Installing the new control module will cause it
to fail also.
7. Verify that the replacement control module is correct for
your application. If so, orient the new module next to the
motor and carefully insert the plug removed in step 5.
Be sure the plug latches. It will click when properly inserted.
48
11. Plug the 5 pin power connector into the motor even though
the plug is keyed, observe the proper orientation. Do not
force the connector. It plugs in very easily when properly oriented. Reversing this plug will cause immediate failure of the control module.
12. Final installation check. Make sure the motor is installed
as follows:
a. As far into the blower housing as possible.
b. Belly bands not covering vent holes or on the control
module.
c. Motor connectors should oriented as to prevent the
accumulation of moisture in the control.
d. Use wire ties to create a drip loop in the motor cables.
13. The installation is now complete. Reapply power to the
furnace and verify that the new motor control module is
working properly.
S-10 CHECKING CAPACITOR
The direct drive motors are of the (psc) permanent split capacitor design. A run capacitor is wired across the auxiliary
and a portion of the main windings. The capacitors primary
function is to reduce the line current while greatly improving
the torque characteristics of a motor. This is accomplished
by using the 90° phase relationship between the capacitor
current and voltage in conjunction with the motor windings
so that the motor will give two phase operation when connected to a single phase circuit. The capacitor also reduces
the line current to the motor by improving the power factor
to the load.
SERVICING
S-10B Capacitance Check
Two quick ways to test a capacitor are a resistance and a
capacitance check. Refer to the next two figures for proper
meter connections for the resistance and capacitance testing of the capacitor.
VOLT / OHM
METER
S-10A Resistance Check
15 AMP FUSE
AMMETER
VOLT / OHM
METER
C
AP
AC
IT
O
R
With power On (and Door Interlock Switch closed):
Testing Capacitor Resistance
Using a hookup as shown above, take the amperage and
voltage readings and use them in the formula:
Capacitance (MFD)= 2650 x Amperage/Voltage
4. After completing check and/or replacement of capacitor, reinstall blower compartment door.
5. Turn on electrical power and verify proper unit operation.
S-11 CHECKING GAS VALVE
1. Remove blower compartment door to gain access to capacitor.
Gas valves provide control of main burner gas flow, pressure
regulation, and 100 percent safety shut-off.
2. Discharge capacitor and remove wire leads.
Gas valve should have 24 volts with a call for heat. If you
have 24 volts at the gas valve and it will not open, replace.
No voltage at the gas valve indicates a problem somewhere
else in the system.
3. Set an ohmmeter on its highest ohm scale and connect
the leads to the capacitor. A digital meter with built-in
capacitance can be used or an analog meter shown
above.
a.
Good Condition - indicator swings to zero and
slowly returns toward infinity.
b.
Shorted - indicator swings to zero and stops there
- replace.
c.
Open - no reading - replace. Reverse leads. Check
again no reading - replace.
d.
Reverse leads and recheck.
Gas pressure on the inlet and outlet side of the gas valve
should be checked and adjusted when needed.
49
SERVICING
S-12 CHECKING HOT SURFACE IGNITOR
The igniter most commonly used is the (B1401018S) 120V
silicone carbide resistive element ignitor for ignition.
NOTE: Failure to earth ground the furnace, reversing the
neutral and hot wire connection to the line (polarity), or a
high resistance connection in the neutral line may cause
the control to lockout due to failure to sense flame.
1. Remove burner compartment door to gain access to the
ignitor.
2. Disconnect the ignitor from the Ignition Control.
3. Using an ohmmeter measure the resistance of the ignitor.
4. Ignitor cool should read between 40 to 75 ohms.
5. Reconnect ignitor.
The ground wire must run from the furnace all the way back
to the electrical panel. Proper grounding can be confirmed
by disconnecting the electrical power and measuring resistance between the neutral (white) connection and the burner
closest to the flame sensor. Resistance should be less than
10 ohms.
The ignition control is a combination electronic and electromechanical device and is not field repairable. Complete unit
must be replaced.
6. Place unit in heating cycle, measure current draw of
ignitor during preheat cycle.
Should read approximately 4 to 4.5 amps.
7. If ignitor is receiving 115 Volts and will not light, replace.
8. After check and/or replacement of hot surface ignitor,
reinstall burner compartment door and verify proper unit
operation.
B1401018S
S-13 CHECKING INTEGRATED IGNITION
CONTROLS
The furnaces are equipped with a combination ignition module and fan control. This device ignites the burners upon a
call for heat. It also controls the venter blower and the various speed selections and timings of the circulating air blower.
This control is located in the circulating air blower compartment. Upon a demand for heat the venter motor is energized. After a short purge, the electronic ignition device is
energized. The burners are ignited and after a short delay,
the burner flame is proven. The circulating air blower is energized approximately (30) seconds after the burners are
ignited. A field selectable fan off timer will turn the circulating air blower off.
THIS CONTROL IS NOT FIELD SERVICABLE.
50
These tests must be completed within a given time frame
due to the operation of the ignition control. Refer to Sequence of Operation section of this manual.
The ignition control is capable of diagnosing many furnace
failures to speed troubleshooting. A flashing red diagnostic
indicator light on the control flashes a code for any discovered failures.
When the control is powered up normally, the light will be
solid red for normal operation. This can be used to test for
115 volts and 24 volts to the control since both must be
present for the light to flash. If this step fails, check for 115
volts to the control, check the fuse and check the transformer and its associated wiring.
See the flash codes shown on the following pages of this
manual.
SERVICING
FLASH CODES
GDT, GMNT, GMP, GMPN, GMT, GMTH, GMNT, GSMS
INSTALLER/SERVICEMAN
THE STATUS LIGHT ON THE FURNACE CONTROL MAY
BE USED AS A GUIDE TO TROUBLESHOOTING THIS
APPLIANCE. STATUS LIGHT CODES ARE AS FOLLOWS:
STATUS LIGHT
EQUIP. PROBLEM
CHECK
ON
NORMAL OPERATION
1 BLINK
IGNITION FAILURE
2 BLINKS
CLOSED PRESSURE
SWITCH
3 BLINKS
PRESSURE SWITCH
FAILURE TO CLOSE
4 BLINKS
OPEN LIMIT SWITCH
5 BLINKS
FALSE FLAME SENSED
STICKING GAS VALVE
INCORRECT TWINNING
REVERSETRANSFORMER
SECONDARY LEADS
REVERSE PRIMARY
RAPID CONTINUOUS
INCORRECT PRIMARY
POLARITY
GAS FLOW
GAS PRESSURE
GAS VALVE
FLAME SENSOR
PRESSURE SWITCH
STUCK CLOSED
VENTER
PRESSURE SWITCH
VENT BLOCKAGE
MAIN LIMIT OPEN
AUX. LIMIT OPEN
WIRES
ADVERTISSEMENT
DECONNECTER DU CIRCUIT D'ALIMENTATION ELECTRIQUE AVANT L'ENTRETIEN.
INSPECTER LES FILTRES CHAQUE MOIS ET REMPLACER SI NECESSAIRE.
TOUS LES FILTRES À AIR DOIVENT ÊTRE APPROUVÉS PAR LES
ULC OU LEUR EQUIVALENT. ON RECÒMMANDE D'UTILISER DES FILTRES À
AIR PERMANTS. UTILISER LE TABLEAU SUIVANT POUR REMPLACER LES FILTRES À
AIR.
WARNING
DISCONNECT THE ELECTRIC
POWER BEFORE SEVICING.
INS PE CT FILTERS MO NTH LY AND
RE PL ACE W HE N NE CES SA RY .
A LL A IR FIL TERS M UST B E
CE RTIFIED B Y ULC O R
E QU IVA LE NT. P ERM AN ENT A IR
FILTE RS AR E RE CO MM EN DED.
W HEN RE PLA CING A IR FILTERS ,
US E TH E FO LLOW ING C HART:
CHASSIS
SIZE
DIM ENIO NS
DU BATI
BOTTOM
APPLICATION
SIDE AIR
INSTALLATION
INSTALLÉ
SUR DESSOUS
INSTALLÉ
SUR LE CÔTÉ
14"
14 " X 25"
18" X 25"
17 .5"
16 " X 25"
18" X 25"
21 "
20 " X 25"
18" X 25"
24.5"
24 " X 25"
18" X 25"
51
SERVICING
FLASH CODES
GMNTE
INSTALLER/SERVICEMAN
THE STATUS LIGHT ON THE FURNACE CONTROL MAY
BE USED AS A GUIDE TO TROUBLESHOOTING THIS
APPLIANCE. STATUS LIGHT CODES ARE AS FOLLOWS:
STATUS LIGHT
EQUIP. PROBLEM
CHECK
ON
FAILED CONTROL BOARD
1 BLINK
IGNITION FAILURE
REPLACE CONTROL
GAS FLOW
GAS PRESSURE
GAS VALVE
FLAME SENSOR
2 BLINKS
CLOSED LOW FIRE
PRESSURE SWITCH
PRESSURE SWITCH
STUCK CLOSED
3 BLINKS
LOW FIRE
PRESSURE SWITCH
FAILURE TO CLOSE
VENTER
PRESSURE SWITCH
VENT BLOCKAGE
4 BLINKS
OPEN LIMIT SWITCH
MAIN, ROLLOUT, AUX,
OR STACK OVERTEMP OPEN
6 BLINKS
115 V POWER REVERSED
115 V POLARITY
7 BLINKS
LOW FLAME SENSE
FLAME SENSOR
8 BLINKS
IGNITER/UNIT GROUND
IGNITER/UNIT GROUND
9 BLINKS
HIGH FIRE
PRESSURE SWITCH
FAILURE TO CLOSE
CONTINUOUS BLINKS
FALSE FLAME SENSED
VENTER
PRESSURE SWITCH
VENT BLOCKAGE
STICKING GAS VALVE
ADVERTISSEMENT
DECONNECTER DU CIRCUIT D'ALIMENTATION ELECTRIQUE AVANT L'ENTRETIEN.
INSPECTER LES FILTRES CHAQUE MOIS ET REMPLACER SI NECESSAIRE.
TOUS LES FILTRES À AIR DOIVENT ÊTRE APPROUVÉS PAR LES
ULC OU LEUR EQUIVALENT. ON RECÒMMANDE D'UTILISER DES FILTRES À
AIR PERMANTS. UTILISER LE TABLEAU SUIVANT POUR REMPLACER LES FILTRES À
AIR.
WARNING
DISCONNECT THE ELECTRIC
POWER BEFORE SEVICING.
INSPECT FILTERS MONTH LY AND
REPLACE W HEN NECESSARY.
ALL AIR FILTERS M UST BE
CERTIFIED BY ULC OR
EQU IVALENT. PERM ANENT AIR
FILTERS AR E RECOMM EN DED.
W HEN REPLACING AIR FILTERS,
USE THE FOLLOW ING CHART:
52
CHASSIS
SIZE
DIMENSIONS
DU BATI
SIDE AIR
BOTTOM
APPLICATION
INSTALLATION
INSTALLÉ
SUR DESSOUS
INSTALLÉ
SUR LE CÔTÉ
14"
14" X 25"
18" X 25"
17.5"
16" X 25"
18" X 25"
21"
20" X 25"
18" X 25"
24.5"
24" X 25"
18" X 25"
SERVICING
FLASH CODES
GMPE
INSTALLER/SERVICEMAN
THE STATUS LIGHT ON THE FURNACE CONTROL MAY
BE USED AS A GUIDE TO TROUBLESHOOTING THIS
APPLIANCE. STATUS LIGHT CODES ARE AS FOLLOWS:
STATUS LIGHT
EQUIP. PROBLEM
CHECK
ON
NORMAL OPERATION
1 BLINK
FAILURE TO DETECT
FLAME SENSE
GAS FLOW
GAS PRESSURE
GAS VALVE
FLAME SENSOR
2 BLINKS
CLOSED PRESSURE
SWITCH
PRESSURE SWITCH
STUCK CLOSED
3 BLINKS
PRESSURE SWITCH
FAILURE TO CLOSE
4 BLINKS
OPEN LIMIT SWITCH
VENTER
PRESSURE SWITCH
VENT BLOCKAGE
MAIN LIMIT OPEN
AUX. LIMIT OPEN
5 BLINKS
FALSE FLAME SENSED
STICKING GAS
VALVE
RAPID CONTINUOUS
REVERSED POLARITY
INCORRECT TWINNING
REVERSE POWER
SUPPLY LEADS
REVERSE TRANS.
SECONDARY LEADS
WARNING
DISCONNECT THE ELECTRIC POWER BEFORE SEVICING.
INSPECT FILTERS MONTHLY AND REPLACE WHEN NECESSARY.
ALL AIR FILTERS MUST BE CERTIFIED BY U.L. OR EQUIVALENT.
PERMANENT AIR FILTERS ARE RECOMMENDED. WHEN REPLACING
AIR FILTERS USE THE FOLLOWING CHART:
MODEL
FILTER
SIZE
GMPE075-1.5/3
GMPE100-2.5/4
GMPE125-3/5
18" X 25"
18" X 25"
18" X 25"
53
SERVICING
FLASH CODES
GMPH
INSTALLER/SERVICEMAN
THE STATUS LIGHT ON THE FURNACE CONTROL MAY
BE USED AS A GUIDE TO TROUBLESHOOTING THIS
APPLIANCE. STATUS LIGHT CODES ARE AS FOLLOWS:
STATUS LIGHT
ON
1 BLINK
EQUIP. PROBLEM
NORMAL OPERATION
IGNITION FAILURE
CHECK
GAS FLOW
GAS PRESSURE
GAS VALVE
FLAME SENSOR
2 BLINKS
CLOSED PRESSURE
SWITCH
3 BLINKS
PRESSURE SWITCH
FAILURE TO CLOSE
4 BLINKS
OPEN LIMIT SWITCH
MAIN LIMIT OPEN
AUX. LIMIT OPEN
5 BLINKS
FALSE FLAME SENSED
STICKING GAS VALVE
RAPID CONTINUOUS
INCORRECT TWINNING
REVERSETRANSFORMER
SECONDARY LEADS
REVERSE PRIMARY
WIRES
INCORRECT PRIMARY
POLARITY
PRESSURE SWITCH
STUCK CLOSED
VENTER
PRESSURE SWITCH
VENT BLOCKAGE
ADVERTISSEMENT
DECONNECTER DU CIRCUIT D'ALIMENTATION ELECTRIQUE AVANT L'ENTRETIEN.
INSPECTER LES FILTRES CHAQUE MOIS ET REMPLACER SI NECESSAIRE.
TOUS LES FILTRES À AIR DOIVENT ÊTRE APPROUVÉS PAR LES
ULC OU LEUR EQUIVALENT. ON RECÒMMANDE D'UTILISER DES FILTRES À
AIR PERMANTS. UTILISER LE TABLEAU SUIVANT POUR REMPLACER LES FILTRES À
AIR.
CHASSIS
WARNING
SIZE
DIMENIONS
DU BÂTI
BOTTOM
APPLICATION
SIDE AIR
INSTALLATION
INSTALLÉ
SUR DESSOUS
INSTALLÉ
SUR LE CÔTÉ
14"
14" X 25"
18" X 25"
17.5"
16" X 25"
18" X 25"
21"
20" X 25"
18" X 25"
24.5"
24" X 25"
18" X 25"
DISCONNECT THE ELECTRIC
POWER BEFORE SEVICING.
INS PE CT FIL TERS MO NTH LY AND
RE PLACE W HE N NE CES SA RY .
A LL A IR FILTERS M UST B E
CE RTIFIE D BY ULC O R
E QU IVA LE NT. P ERM AN ENT A IR
FILTE RS AR E RE CO MM EN DED.
W HEN RE PLA CING A IR FILTERS ,
US E TH E FO LLOW ING C HART:
54
SERVICING
FLASH CODES
GSU
INSTALLER/SERVICEMAN
THE STATUS LIGHT ON THE FURNACE CONTROL MAY
BE USED AS A GUIDE TO TROUBLESHOOTING THIS
APPLIANCE. STATUS LIGHT CODES ARE AS FOLLOWS:
STATUS LIGHT
EQUIP. PROBLEM
CHECK
ON
NORMAL OPERATION
---
1 BLINK
IGNITION FAILURE
2 BLINKS
CLOSED
PRESSURE SWITCH
PRESSURE SWITCH
STUCK CLOSED
3 BLINKS
LOW FIRE
PRESSURE SWITCH
FAILURE TO CLOSE
VENTER MOTOR
PRESSURE SWITCH
VENT BLOCKAGE
PRESSURE PORT TAP STOPPED UP
4 BLINKS
OPEN LIMIT SWITCH
MAIN LIMIT OPEN
5 BLINKS
FALSE FLAME SENSED
GAS VALVE STICKING
HIGH FIRE
PRESSURE SWITCH
FAILURE TO CLOSE
6 BLINKS
CHECK POLARITY
INCORRECT TWINNING
RAPID CONTINOUS
NO LIGHT
GAS FLOW
GAS PRESSURE
GAS VALVE
FLAME SENSOR
IGNITION CONTROL FAILURE
VENTER MOTOR
PRESSURE SWITCH
VENT BLOCKAGE
PRESSURE PORT TAP STOPPED UP
SWAP SEC. TRANSFORMER LEADS
SWAP L1 & L2 LEADS
CHECK FUSE & TRANSFORMER
CHECK FOR 115V at Control Board
ADVERTISSEMENT
DECONNECTER DU CIRCUIT D'ALIMENTATION ELECTRIQUE AVANT L'ENTRETIEN.
INSPECTER LES FILTRES CHAQUE MOIS ET REMPLACER SI NECESSAIRE.
TOUS LES FILTRES À AIR DOIVENT ÊTRE APPROUVÉS PAR LES
À
ULC OU LEUR EQUIVALENT. ON RECÒMMANDE D'UTILISER DES FILTRES
À
AIR PERMANTS. UTILISER LE TABLEAU SUIVANT POUR REMPLACER LES FILTRES
AIR.
WARNING
DISCONNECT THE ELECTRIC
POWER BEFORE SEVICING.
INSPECT FILTERS MONTHLY AND
REPLACE WHEN NECESSARY.
ALL AIR FILTERS MUST BE
CERTIFIED BY ULC OR
EQUIVALENT. PERMANENT AIR
FILTERS ARE RECOMMENDED.
WHEN REPLACING AIR FILTERS,
USE THE FOLLOWING CHART:
CHASSIS
SIZE
BOTTOM
APPLICATION
INSTALLÉ
DIMENSIONS
SUR DESSOUS
DU BATI
SIDE AIR
INSTALLATION
INSTALLÉ
SUR LE CÔTÉ
14"
14" X 25"
18" X 25"
17.5"
16" X 25"
18" X 25"
21"
20" X 25"
18" X 25"
24.5"
24" X 25"
18" X 25"
55
SERVICING
S-14 CHECKING FLAME SENSOR
A flame sensing device is used in conjunction with the ignition control module to prove combustion. If proof of flame is
not present the control will de-energize the gas valve and
"retry" for ignition or lockout.
3. Be sure the negative side of the meter is connected to
the wire and the positive side of the meter is to sensor
terminal.
Digital Meter
2.0
DC
The following drawing illustrated from a bottom view, the
approximate distances for the ignitor and flame sensor to
the gas inshot burner. This may vary on different models.
You will note they are in the main burner stream.
IGNITOR
FLAME SENSOR
3/8" ± .1/16"
1/4
± .1/16
FLAME
SENSOR
WIRE FROM
CONTROL
BOARD
4. Place the unit into a heating cycle.
Models with Integrated Ignition
Control & Flame Sensor Probe
5. As soon as flame is established a micro-amp reading
should be evident once proof of flame (micro-amp reading) is established, the hot surface ignitor will be deenergized.
6. The Integrated Ignition controls will have 1 to 4 microamps. If the micro-amp reading is less .8uA (micro-amp
DC). Check for high resistance wiring connections, sensor to burner gap, dirty flame sensor, or poor grounding.
7. Clean flame sensor with steel wool or emery cloth before replacing any components. DO NOT use sandpaper. See note below.
1. Disconnect the flame sensor wire from the sensor terminal.
2. Connect a micro-amp meter in series with this wire and
the sensor terminal. See next illustration.
56
NOTE: Contaminated fuel or combustion air can create a
nearly invisible coating on the flame sensor. This coating
works as an insulator causing a loss in the flame sense
signal. If this situation occurs the flame sensor must be
cleaned with steel wool or emery cloth.
SERVICING
S-15 CHECKING MAIN BURNERS
The main burners are used to provide complete combustion
of various fuels in a limited space, and transfer this heat of
the burning process to the heat exchanger.
Proper ignition, combustion, and extinction are primarily due
to burner design, orifice sizing, gas pressure, primary and
secondary air, vent and proper seating of burners.
In checking main burners, look for signs of rust, oversized
and undersized carry over ports restricted with foreign material, etc, refer to previous drawing.
We have used several in shot burner designs over the years
and illustrated in the following illustrations.
Other older main burners (shown below) should not need
adjustment in most instances. However, burner air shutters
are provided should adjustment be necessary. After the
furnace has been in operation for at least five (5) minutes
loosen the air shutter locking screws and close the
shutter until yellow tipped flames appear. Now slowly
open the shutter until the yellow disappears. Retighten
the locking screw.
.023" - .027"
(Beckett Burner - New Style)
57
58
BL
ROS
P
ROS
PS1
THE LEADS FROM THE MOTOR
MAY BE CHANGED TO THE
REQUIRED SPEED.
P
B
G
P.V.
MOTOR
B
P
Y
ROS
24V
P
Y
Y
W
B
BL
R
PS2
R
LS
BL
W
R
W
P
SO
8
9
R
5
2
6
3
R
G
W
7
4
1
TWIN
W
P
O
FS
NEUTRALS
FROM FURNACE
CHASSIS GROUND
FS
GV
PSO
PSI
LIMIT
LIMIT
NOTE:
GV
DS
G
T'STAT
W
G
R
FS
HSI
W
B
TO 115/1/60
POWER SUPPLY
CONDENSING
UNIT
W
G
R
W
PRI
TRANS
BR
BR
IDB
MED
B
*MED-LO - ORANGE
R
HIGH
LOW
BL
CAPACITOR
G
*HI - BLACK
*MED - BLUE
*LOW - RED
L2
IND
HSI
M2
M1
HEAT
COOL
B
WIRING
ROS ROLLOUT SWITCH
SO STACK OVERTEMP SWITCH
LS LIMIT SWITCH
PS1 PRESSURE SWITCH, FIRE
PS2 PRESSURE SWITCH, COMB. BOX
PV POWER VENTOR
PVR POWER VENT RELAY
RED
(2)
W WHITE (0)
Y YELLOW (3)
R
WIRE CODE
IDBR1 INDOOR BLOWER HEAT RELAY
IDBR2 INDOOR BLOWER COOL RELAY
ROS
IDBR2
HSI
COOL
HEAT
I.D.B.
GV
P.V.
C
B14933-223
3. THE LEADS FROM THE MOTOR MAY
BE CHANGED TO REQUIRED SPEED.
2. WARNING: CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL.(105ºF).
UNMARKED TERMINAL
MARKED TERMINAL
WIRE SPLICE
ROS
IDBR1
NOTES
LOW VOLTAGE
FIELD INSTALLED POWER
FIELD INSTALLED CONTROL
(1)
B BLACK
(4)
BL BLUE
BR BROWN (7)
G GREEN (8
O ORANGE (6)
(9)
PK PINK
PU PURPLE (5)
HSIR HOT SURFACE IGNTION RELAY
IDB INDOOR BLOWER
HSIR
LINE VOLTAGE
ROS
PVR
FUSE
HSIR
HSI HOT SURFACE IGNITOR
PS2
IDBR2
IDBR1
GV GAS VALVE
FS FLAME SENSOR
SO
PS1
LS
PVR
COMPONENT LEGEND
DS DOOR SWITCH
W
G
R
DS
115 / 60 / 1
POWER SUPPLY
WIRING DIAGRAMS
GMTH, GMT
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
BL
GV
P
DS
B
G
P
ROS
PS
P
B
ROS
24V
P
Y
Y
W
B
BL
R
LS
ROS
R
W
R
BL
W
P
R
9
6
3
R
G
W
SO
7
8
1
4
5
2
TWIN
W
P
O
FS
NEUTRALS
FROM FURNACE
CHASSIS GROUND
FS
GV
PSO
PSI
LIMIT
LIMIT
ROS
G
P.V.
MOTOR
T'STAT
Y
W
G
R
FS
HSI
W
B
TO 115/1/60
POWER SUPPLY
CONDENSING
UNIT
W
G
R
W
PRI
TRANS
L2
IND
HSI
M2
M1
HEAT
COOL
BR
BR
IDB
CAPACITOR
G
BL
R
B
HIGH
LOW
MED
B
SO
PS
LS
PVR
ROS ROLLOUT SWITCH
SO STACK OVERTEMP SWITCH
LS LIMIT SWITCH
PS1 PRESSURE SWITCH, FIRE
PS2 PRESSURE SWITCH, COMB. BOX
PV POWER VENTOR
PVR POWER VENT RELAY
IDBR1 INDOOR BLOWER HEAT RELAY
IDBR2 INDOOR BLOWER COOL RELAY
HSIR HOT SURFACE IGNTION RELAY
IDB INDOOR BLOWER
HSI HOT SURFACE IGNITOR
FS FLAME SENSOR
GV GAS VALVE
COMPONENT LEGEND
DS DOOR SWITCH
W
G
R
DS
ROS
WIRING
ROS
IDBR2
HSI
COOL
HEAT
RED
(2)
W WHITE (0)
Y YELLOW (3)
GV
P.V.
UNMARKED TERMINAL
MARKED TERMINAL
WIRE SPLICE
I.D.B.
C
B14933-226
3. THE LEADS FROM THE MOTOR MAY
BE CHANGED TO REQUIRED SPEED.
2. WARNING: CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL.(105ºF).
NOTES
ROS
IDBR1
FIELD INSTALLED CONTROL
LOW VOLTAGE
FIELD INSTALLED POWER
(1)
B BLACK
(4)
BL BLUE
BR BROWN (7)
G GREEN (8)
O ORANGE (6)
(9)
PK PINK
PU PURPLE (5)
R
HSIR
LINE VOLTAGE
ROS
PVR
FUSE
HSIR
WIRE CODE
IDBR2
IDBR1
115 / 60 / 1
POWER SUPPLY
WIRING DIAGRAMS
GMNT
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
59
60
BL
GV
ROS
P
B
ROS
G
P.V.
MOTOR
P
PS1
ROS
B
P
Y
Y
W
B
BL
ROS
24V
R
P
R
W
R
W
SO
LS
BL
P
5
8
6
9
R
2
3
R
G
W
7
4
1
TWIN
W
ALS
P
O
FS
NEUTRALS
FROM FURNACE
CHASSIS GROUND
FS
GV
PSO
PSI
LIMIT
LIMIT
P
DS
G
T'STAT
Y
W
G
R
FS
HSI
W
B
TO 115/1/60
POWER SUPPLY
CONDENSING
UNIT
W
G
R
W
PRI
TRANS
L2
IND
HSI
M2
M1
HEAT
COOL
BR
BR
IDB
CAPACITOR
G
BL
R
B
HIGH
LOW
MED
B
ALS
PS1
LS
PVR
SO
SO STACK OVERTEMP SWITCH
ROS ROLLOUT SWITCH
LS LIMIT SWITCH
PS1 PRESSURE SWITCH, FIRE
PS2 PRESSURE SWITCH, COMB. BOX
PV POWER VENTOR
PVR POWER VENT RELAY
IDBR2 INDOOR BLOWER COOL RELAY
IDBR1 INDOOR BLOWER HEAT RELAY
HSIR HOT SURFACE IGNTION RELAY
IDB INDOOR BLOWER
HSI HOT SURFACE IGNITOR
GV GAS VALVE
FS FLAME SENSOR
COMPONENT LEGEND
ALS AUXILIARY LIMIT SWITCH
DS DOOR SWITCH
W
G
R
DS
ROS
WIRING
ROS
HSIR
ROS
IDBR2
HSI
COOL
HEAT
W WHITE (0)
Y YELLOW (3)
G GREEN (8)
O ORANGE (6)
(9)
PK PINK
PU PURPLE (5)
(2)
R RED
(1)
B BLACK
(4)
BL BLUE
BR BROWN (7)
IDBR1
GV
P.V.
UNMARKED TERMINAL
MARKED TERMINAL
WIRE SPLICE
ROS
I.D.B.
C
B14933-227
3. THE LEADS FROM THE MOTOR MAY
BE CHANGED TO REQUIRED SPEED.
2. WARNING: CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL.(105ºF).
NOTES
FIELD INSTALLED CONTROL
LOW VOLTAGE
FIELD INSTALLED POWER
LINE VOLTAGE
PVR
FUSE
HSIR
WIRE CODE
IDBR2
IDBR1
115 / 60 / 1
POWER SUPPLY
WIRING DIAGRAMS
GMNT
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
BL
ROS
P
ROS
PS1
THE LEADS FROM THE MOTOR
MAY BE CHANGED TO THE
REQUIRED SPEED.
P
B
G
P.V.
MOTOR
Y
P
B
ROS
24V
P
Y
Y
W
B
BL
R
PS2
R
LS
BL
W
R
W
P
R
SO
7
8
9
1
4
5
2
TWIN
6
3
R
G
W
W
P
O
FS
NEUTRALS
FROM FURNACE
CHASSIS GROUND
FS
GV
PSO
PSI
LIMIT
LIMIT
NOTE:
GV
DS
G
T'STAT
W
G
R
FS
HSI
W
B
TO 115/1/60
POWER SUPPLY
CONDENSING
UNIT
W
G
R
W
PRI
TRANS
BR
BR
IDB
MED
B
BL
*MED-LO - ORANGE
*LOW - RED
R
HIGH
LOW
CAPACITOR
G
*HI - BLACK
*MED - BLUE
L2
IND
HSI
M2
M1
HEAT
COOL
B
W
G
R
ALS
DS
PFC
FS
FRS
GV
HSI
ICB
LS
MC
PS
TR
PV
IDB
IDBR
PVR
CR
HR
DS
PS2
AUX. LIMIT SWITCH
BLWR. DOOR SWITCH
POWER FACTOR TRANS.
FLAME SENSOR
FLAME ROLL-OUT SWITCH
GAS VALVE
HOT SURFACE IGNITOR
IGNITION CONTROL BOARD
MAIN LIMIT SWITCH
MOTOR CONTROLLER
PRESSURE SWITCH
TRANSFORMER
POWER VENTER
INDOOR BLOWER
INDOOR BLWR RELAY
POWER VENT RELAY
COOL RELAY
HEAT RELAY
SO
PS1
LS
PVR
HSIR
WIRING CODE
ROS
PVR
FUSE
HSIR
B
BL
BR
G
O
PK
PU
R
W
Y
BLACK
BLUE
BROWN
GREEN
ORANGE
PINK
PURPLE
RED
WHITE
YELLOW
WIRE CODE
(1)
(4)
(7)
(8
(6)
(9)
(5)
(2)
(0)
(3)
FACTORY WIRING
HIGH VOLTAGE
LOW VOLTAGE
IDBR2
IDBR1
115 / 60 / 1
POWER SUPPLY
ROS
IDBR2
HSI
COOL
HEAT
GV
P.V.
B48578-02
3. ALL UNUSED MOTOR
SPEED LEADS GET
PLACED ON M1, M2 OR CAPPED.
2. WARNING CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL
CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL
(105°C).
NOTES:
ROS
IDBR1
I.D.B.
WIRING DIAGRAMS
GMNT B SERIES
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
61
62
BL
GV
P
P
B
ROS
G
P.V .
MOTOR
PS
ROS
B
P
24V
Y
Y
P
R
W
R
BL
LS
SO
W
9
P
7
5
8
6
R
4
2
3
1
TWIN
LIMIT
PSI
ALS
LIMIT
ROS
W
B
BL
R
W
R
G
W
P
O
NEUTRALS
FS
FROM FURNACE
CHASSIS GROUND
FS
ROS
DS
Y
W
G
R
GV
HSI
W
B
G
P
T'STAT
TO 115/1/60
POWER SUPPLY
CONDENSING
UNIT
W
G
R
W
PRI
TRANS
L2
BR
BR
IDB
B
*O
*BL
*R
*B
*HI - BLACK
*MED - BLUE
*LOW - RED
*MED-LO - ORANGE
CAPACITOR
G
IND
HSI
M2
M1
HEAT
COOL
ALS
PS1
LS
PVR
SO
ROS ROLLOUT SWITCH
SO STACK OVERTEMP SWITCH
LS LIMIT SWITCH
PS1 PRESSURE SWITCH, FIRE
PS2 PRESSURE SWITCH, COMB. BOX
PV POWER VENTOR
PVR POWER VENT RELAY
IDBR2 INDOOR BLOWER COOL RELAY
IDBR1 INDOOR BLOWER HEAT RELAY
HSIR HOT SURFACE IGNTION RELAY
IDB INDOOR BLOWER
HSI HOT SURFACE IGNITOR
GV GAS VALVE
FS FLAME SENSOR
COMPONENT LEGEND
ALS AUXILIARY LIMIT SWITCH
DS DOOR SWITCH
W
G
R
DS
ROS
WIRING
ROS
HEAT
ROS
IDBR2
HSI
COOL
RED
(2)
W WHITE (0)
Y YELLOW (3)
IDBR1
GV
P.V.
UNMARKED TERMINAL
MARKED TERMINAL
WIRE SPLICE
ROS
I.D.B.
B14933-234
4. ALL UNUSED MOTOR LEADS GET PLACED
ON M1 AND M2 OR CAPPED.
3. THE LEADS FROM THE MOTOR MAY
BE CHANGED TO REQUIRED SPEED.
2. WARNING: CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL.(105ºF).
NOTES
LOW VOLTAGE
FIELD INSTALLED POWER
FIELD INSTALLED CONTROL
(1)
B BLACK
(4)
BL BLUE
BR BROWN (7)
G GREEN (8)
O ORANGE (6)
(9)
PK PINK
PU PURPLE (5)
R
HSIR
LINE VOLTAGE
PVR
FUSE
HSIR
WIRE CODE
IDBR2
IDBR1
115 / 60 / 1
POWER SUPPLY
WIRING DIAGRAMS
GMNT B SERIES
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
FS
PSO
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
LS
R
BL
GV
HI
SO
COM
P
LOW
P
R
P
P
FS
ALS
BR
PS
PS
P
O
G
BL
O
BL
P
Y
Y
24V
ROS
R
P
W
B
B
HOT
DS
P
LINE
XFMR
NEUTRALS
TO 115/1/60
POWER SUPPLY
G
W
PV
HUM
ROS
HUM
P
ROS
CIRC
P
EAC
ROS
LINE
W
MODELS
NOT ALL
PFC
B
W
HSI
W
B
W
B
*MED-LO - ORANGE
*HI - BLACK
*MED - BLUE
*LOW - RED
R
G
IDB
R
FUSE
PVR1
SO
HSIR
PFC
PVR2 POWER VENT RELAY, HIGH FIRE
ROS ROLLOUT SWITCH
SO STACK OVERTEMP SWITCH
LS
MODELS
NOT ALL
LS LIMIT SWITCH
PS1 PRESSURE SWITCH, LOW FIRE
PS2 PRESSURE SWITCH, HIGH FIRE
PV POWER VENTOR
PVR1 POWER VENT RELAY, LOW FIRE
HSIR HOT SURFACE IGNTION RELAY
IDB INDOOR BLOWER
PFC POWER FACTOR CHOKE
XFMR TRANSFORMER
FS FLAME SENSOR
GV GAS VALVE
HSI HOT SURFACE IGNITOR
COMPONENT LEGEND
ALS AUXILIARY LIMIT SWITCH
DS DOOR SWITCH
G
Y
YLO
W2
W1
DS
PS2
RO
XFMR
HIGH
RO
W WHITE (0)
Y YELLOW (3)
(1)
B BLACK
(4)
BL BLUE
BR BROWN (7)
G GREEN (8)
O ORANGE (6)
(9)
PK PINK
PU PURPLE (5)
(2)
R RED
UNMARKED TERMINAL
MARKED TERMINAL
GV
HIGH
C
B14933-235
3. POWER FACTORY CHOKE PRESENT
ONLY ON UNITS WITH 3/4 AND
1 HP INDOOR BLOWERS.
2. WARNING: CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL.(105ºF).
NOTES
FAN
PVR2
LOW
PVR1
HSI
IDB
WIRE SPLICE
HIGH COOL
LOW COOL
ALS
IDB
HIGH HEAT
PS1
HSIR
LOW HEAT
PV
LOW VOLTAGE
FIELD INSTALLED POWER
FIELD INSTALLED CONTROL
LINE VOLTAGE
WIRING
RO
WIRE CODE
RO
FS
PVR2
LOW
115 / 60 / 1
POWER SUPPLY
WIRING DIAGRAMS
GMNTE
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
63
XFMR
EAC
64
BL
T'STAT
B
P
G
P.V.
MOTOR
P
R
Y
Y
LS
P
R
W
R
BL
R
P
8
9
7
4
1
ROS
W
GV
LIMIT
* MED HI - YELLOW
MED LOW - ORANGE
ROS
W
5
2
6
3
TWIN
LIMIT
ROS
W
B
BL
R
R
G
W
PSI
ROS
PS
B
24V
PSO
THE LEADS FROM THE MOTOR
MAY BE CHANGED TO THE
REQUIRED SPEED.
GV
DS
G
Y
W
G
R
P
P
NEUTRALS
SO
FS
NOTE:
BL
HSI
W
B
TO 115/1/60
POWER SUPPLY
CONDENSING
UNIT
W
G
R
FROM FURNACE
CHASSIS GROUND
FS
W
O
PRI
TRANS
L2
BR
BR
IDB
MED
B
*
BL
*
R
HIGH
LOW
CAPACITOR
G
IND
HSI
M2
M1
HEAT
COOL
B
SO - STACK OVERTEMP SWITCH
ROS - ROLLOUT SWITCH
PVR - POWER VENT RELAY
PV - POWER VENTOR
LS - LIMIT SWITCH
PS - PRESSURE SWITCH
IDBR - INDOOR BLOWER RELAY
IDB - INDOOR BLOWER
HSIR HOT SURFACE IGNITION RELAY
SO
PS
LS
HSI - HOT SURFACE IGNITOR
GV - GAS VALVE
FS - FLAME SENSOR
DS - DOOR SWITCH
W
G
R
PVR
ROS
WIRING CODE
PVR
FUSE
HSIR
BLACK
BLUE
BROWN
GREEN
ORANGE
B
BL
BR
G
O
P
W
Y
R
PK
ROS
IDBR1
PURPLE
WHITE
YELLOW
RED
PINK
I.D.B.
GV
P.V.
(5)
(0)
(3)
(2)
(9)
B2857804
2. WARNING CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL
CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL
(105°C).
NOTES:
HSI
COOL
HEAT
IDBR2
ROS
(4)
(7)
(8)
(6)
HSIR
(1)
WIRE COLOR CODE
FACTORY WIRING
HIGH VOLTAGE
LOW VOLTAGE
ROS
IDBR2
IDBR1
115 / 60 / 1
POWER SUPPLY
WIRING DIAGRAMS
GMPN
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
FS
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
B
W
BL
Y
LS
R
COM
HI
ALS
9
6
R
G
W
3
ROS
ROS
Y
GV
LO
PS
R
W
8
5
2
P
P
P
7
4
1
TWIN
P
FS
ROS
P
O
FS
BL
R
BL
R
G
NEUTRALS
ICB
BR
P
ROS
W
W
B
L2
IND
HSI
M2
M1
HEAT
B
P.V.
W
COOL
W
B
W
DS
BR
O
B
B
J3
G
Y1
Y/Y2
R
E
W1/W2
W2
C2
C1
O
OTC
OT1
OT2
6
G
HSI
B
B
115/1/60
POWER SUPPLY
BL
115V
PFC
SEE NOTE
#3
J2
27
BL
HUM
Y
IDB
MC
2
BL
1
R
3
W2
RELAY
4
BR
W
W
Y
G
{
BL
24V
TO
CONDENSING
UNIT
TO THERMOSTAT
WHITE=W1
BROWN=W2
GREEN=G
RED=R
YELLOW=Y
BR
DS
PS
LS
PVR
IDBR
IDBR
AL
PVR
ALS - AUXILIARY LIMIT SWITCH
DS - DOOR SWITCH
CR - COOL RELAY
HR - HEAT RELAY
FS - FLAME SENSOR
GV - GAS VALVE
HSI - HOT SURFACE IGNITOR
ICB - INTERGRATED CIRCUIT BOARD
IDB - INDOOR BLOWER
IDBR - INDOOR BLOWER RELAY
LS - LIMIT SWITCH
PS - PRESSURE SWITCH
PV - POWER VENTOR
PVR - POWER VENT RELAY
ROS - ROLLOUT SWITCH
MC - MOTOR CONTROLLER
TR - TRANSFORMER
HSIR - HOT SURFACE IGNITOR RELAY
W2R - W2 RELAY
PFC - POWER-FACTOR CHOKE TRANSFORMER
W2
W1
G
R
L1
WIRING CODE
FUSE
ROS
BLACK
BLUE
BROWN
GREEN
ORANGE
B
BL
BR
G
O
WIRE COLOR CODE
FIELD WIRING
HIGH VOLTAGE
FACTORY WIRING
HIGH VOLTAGE
LOW VOLTAGE
ROS
HSIR
COOL
HEAT
PURPLE
R
RED
WHITE
YELLOW
PINK
P
W
Y
PK
ROS
IDBR
PFC
ROS
W2R
W2R
GV
P.V.
3. PFC USED ON
GMPE100 & 125 MODELS
ONLY.
2. WARNING CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL
CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL
(105°C).
NOTES:
HSI
I.D.B.
B2557806
L2
WIRING DIAGRAMS
GMPE
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
65
B
W
66
BL
Y
LS
COM
HI
ALS
ROS
ROS
Y
GV
LO
PS
R
9
6
3
R
8
5
2
P
P
P
7
4
1
TWIN
P
FS
ROS
P
O
FS
BL
R
BL
W
G
NEUTRALS
ICB
BR
P
ROS
W
W
B
L2
IND
HSI
M2
M1
HEAT
COOL
P.V.
W
B
W
B
W
DS
BR
O
B
B
J3
G
Y1
Y/Y2
R
E
W1/W2
W2
C2
C1
O
OTC
OT1
OT2
G
HSI
B
PFC
B
115/1/60
POWER SUPPLY
BL
115V
SEE NOTE
#3
J2
BL
HUM
Y
IDB
MC
BL
1
2
W2
W
R
W
Y
G
BR
*HI - BLACK
*MED - BLUE
*LOW - RED
*MED-LO - ORANGE
3
RELAY
4
BR
TO THERMOSTAT
{
BL
24V
W
R G
TO
CONDENSING
UNIT
DS
PS
LS
PVR
IDBR
IDBR
AL
MASTER CONTROLLER
PRESSURE SWITCH
TRANSFORMER
POWER VENTOR
INDOOR BLOWER
HR HEAT RELAY
IDBR INDOOR BLOWER RELAY
PVR POWER VENT RELAY
CR COOL RELAY
MC
PS
TR
PV
IDB
FSR FLAME ROLLOUT SWITCH
GV GAS VALVE
HSI HOT SURFACE IGNITOR
ICB IGNITION CONTROL BOARD
LS LIMIT SWITCH
FS FLAME SENSOR
COMPONENT LEGEND
ALS AUXILIARY LIMIT SWITCH
DS DOOR SWITCH
W2
W1
G
R
L1
PVR
ROS
HSIR
COOL
HEAT
ROS
IDBR
RED
R
W WHITE
Y YELLOW
GREEN
ORANGE
PINK
PURPLE
G
O
PK
PU
B BLACK
BL BLUE
BR BROWN
WIRE CODE
W2R
W2R
I.D.B.
GV
P.V.
B14933-184
3. PFC USED ON GMPE100 & 125 MODELS
ONLY.
2. WARNING: CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL.(105ºF).
UNMARKED TERMINAL
MARKED TERMINAL
WIRE SPLICE
ROS
NOTES
FIELD INSTALLED CONTROL
LOW VOLTAGE
FIELD INSTALLED POWER
LINE VOLTAGE
WIRING
ROS
FUSE
HSI
PFC
L2
WIRING DIAGRAMS
GMPE
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
BL
HSI
DS
P.V.
PS
B
BL
P
R
Y
R
R
BL
ROS
LS
W
Y
W
B
BL
24V
W
G
R
BL
R
B
W
8
9
7
4
1
TWIN
Y
ROS
5
6
R
2
3
W
G
R
Y
ALS
P
P
ROS
ROS
P
W
NEUTRALS
P
O
PRI
TRANS
FURNACE CHASSIS GND.
FS
GV
B
G
MOTOR
T'STAT
Y
W
G
R
FS
GV
PSO
PSI
LIMIT
LIMIT
W
B
G
TO 115/1/60
POWER SUPPLY
UNIT
OPTIONAL CONDENSING
Y
FS
L2
HSI
M2
M1
HEAT
COOL
BR
BR
IDB
B
CAPACITOR
G
IND
MED
*
LOW
BL
HIGH
*R
B
ALS
PS
LS
SO STACK OVER
TEMP SWITCH
TR TRANSFORMER
ROS ROLLOUT SWITCH
IDBR INDOOR BLOWER RELAY
LS LIMIT SWITCH
PS PRESSURE SWITCH
PV POWER VENTOR
PVR POWER VENT RELAY
FS FLAME SENSOR
GV GAS VALVE
HSI HOT SURFACE IGNITOR
ICB INTEGRATED CIRCUIT BOARD
IDB INDOOR BLOWER
COMPONENT LEGEND
ALS AUXILIARY LIMIT SWITCH
DS DOOR SWITCH
W
G
R
PVR
ROS
PVR
IDBR1
WIRING
ROS
IDBR1
RED
R
W WHITE
Y YELLOW
GREEN
ORANGE
PINK
PURPLE
G
O
PK
PU
B BLACK
BL BLUE
BR BROWN
GV
P.V.
B14933-175
2. WARNING: CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL.(105ºF).
UNMARKED TERMINAL
MARKED TERMINAL
WIRE SPLICE
I.D.B.
NOTES
FIELD INSTALLED CONTROL
LOW VOLTAGE
FIELD INSTALLED POWER
ROS
HSI
COOL
IDBR2
LINE VOLTAGE
HSIR
WIRE CODE
ROS
FUSE
HSIR
IDBR2
HEAT
POWER SUPPLY
115 / 60 / 1
WIRING DIAGRAMS
GMPH
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
67
68
GV
B
G
P.V.
MOTOR
PS
B
P
Y
Y
LS
W
R
W
G
R
W
B
BL
24V
BL
W
G
R
ROS
R
R
BL
W
R
B
W
P
9
7
4
1
TWIN
ROS
Y Y
5
8
6
R
2
3
R
G
P
NEUTRALS
FURNACE CHASSIS GND.
LIMIT
THE LEADS FROM THE MOTOR MAY BE
CHANGED TO THE REQUIRED SPEED.
HSI
W
DS
T'STAT
Y
BL
LIMIT
NOTE:
BL
B
G
TO 115/1/60
POWER SUPPLY
UNIT
OPTIONAL CONDENSING
Y
W
O
PRI
TRANS
BR
BR
IDB
CAPACITOR
G
B
*R
BL
R
*MED-HI - ORANGE
*MED-LO - YELLOW
HIGH
LOW
*
BL
MED
B
25
*MED - BLUE
*LOW - RED
FS
L2
IND
HSI
M2
M1
HEAT
COOL
M2
M1
HEAT
COOL
B
PS
LS
ROS - ROLLOUT SWITCH
PVR - POWER VENT RELAY
PV - POWER VENTOR
LS - LIMIT SWITCH
PS - PRESSURE SWITCH
IDBR - INDOOR BLOWER RELAY
IDB - INDOOR BLOWER
HSIR - HOT SURFACE IGNITOR RELAY
GV - GAS VALVE
HSI - HOT SURFACE IGNITOR
FS - FLAME SENSOR
DS - DOOR SWITCH
W
G
R
PVR
ROS
BLACK
BLUE
BROWN
GREEN
ORANGE
B
BL
BR
G
O
P
W
Y
(4)
(7)
(8)
(6)
R
PK
(1)
WIRE COLOR CODE
FACTORY WIRING
HIGH VOLTAGE
LOW VOLTAGE
HSIR
HSIR
FUSE
IDBR2
WIRING CODE
PVR
IDBR1
115 / 60 / 1
POWER SUPPLY
RED
PURPLE
WHITE
YELLOW
PINK
ROS
(5)
(0)
(3)
(2)
(9)
I.D.B.
GV
P.V.
4. ALL UNUSED MOTOR SPEED
LEADS GET PLACED ON
MI AND M2.
3. FOR MODEL GMT140-5
SEE FIG #1.
2. WARNING CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL
CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL
(105°C.)
NOTES:
IDBR1
IDBR2
HSI
COOL
HEAT
B4057802
WIRING DIAGRAMS
GMT & GMT A SERIES
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
FS
PSO
PSI
GV
FS
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
GV
B
G
P.V.
MOTOR
PS
B
BL
P
W
B
BL
24V
Y
Y
LS
W
R
W
G
R
BL
ROS
R
R
BL
R
B
10
W
W
P
8
9
7
4
1
TWIN
17
ROS
Y Y
5
6
R
2
3
R
G
P
NEUTRALS
FURNACE CHASSIS GND.
LIMIT
THE LEADS FROM THE MOTOR MAY BE
CHANGED TO THE REQUIRED SPEED.
HSI
W
DS
G
T'STAT
Y
W
G
R
LIMIT
NOTE:
BL
B
TO 115/1/60
POWER SUPPLY
UNIT
OPTIONAL CONDENSING
Y
W
O
PRI
TRANS
FS
L2
BR
BR
IDB
MED
B
BL
*MED - BLUE
*LOW - RED
HIGH
LOW
*
*
R
B
SEENOTE#3
CAPACITOR
G
IND
HSI
M2
M1
HEAT
COOL
PS
LS
ROS - ROLLOUT SWITCH
PVR - POWER VENT RELAY
PV - POWER VENTOR
LS - LIMIT SWITCH
PS - PRESSURE SWITCH
IDBR - INDOOR BLOWER RELAY
IDB - INDOOR BLOWER
HSIR - HOT SURFACE IGNITOR RELAY
GV - GAS VALVE
HSI - HOT SURFACE IGNITOR
FS - FLAME SENSOR
DS - DOOR SWITCH
W
G
R
PVR
WIRING CODE
ROS
B
BL
BR
G
O
BLUE
BROWN
GREEN
ORANGE
BLACK
(1)
(4)
(7)
(8)
(6)
WIRE COLOR CODE
P
W
Y
R
PK
HSIR
HSIR
FUSE
IDBR2
FACTORY WIRING
HIGH VOLTAGE
LOW VOLTAGE
PVR
IDBR1
115 / 60 / 1
POWER SUPPLY
PINK
PURPLE
WHITE
YELLOW
RED
ROS
(5)
(0)
(3)
(2)
(9)
I.D.B.
GV
P.V.
3. MODEL GMT140-5 USES HIGH
SPEED (BLK) FOR HEATING
AND COOLING.
2. WARNING CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL
CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL
(105°C).
NOTES:
IDBR1
IDBR2
HSI
COOL
HEAT
B4057801
WIRING DIAGRAMS
GMT, GMTH
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
FS
PSO
GV
PSI
FS
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
69
70
BL
HSI
W
B
DS
G
GV
B
G
Y
B
PS
T'STAT
P.V.
MOTOR
TO 115/1/60
POWER SUPPLY
UNIT
OPTIONAL CONDENSING
Y
P
W
B
BL
24V
BL
W
G
R
Y
Y
LS
W
R
W
G
R
BL
ROS
R
R
BL
R
W
B
P
8
9
7
4
1
TWIN
LIMIT
LIMIT
ROS
Y Y
5
6
R
2
3
R
G
W
P
W
NEUTRALS
FURNACE CHASSIS GND.
O
PRI
TRANS
FS
L2
BR
BR
IDB
MED
B
CAPACITOR
G
IND
HSI
M2
M1
HEAT
COOL
*
LOW
BL
R
HIGH
*
B
PS
LS
IDBR INDOOR BLOWER RELAY
LS LIMIT SWITCH
PS PRESSURE SWITCH
PV POWER VENTOR
PVR POWER VENT RELAY
ROS ROLLOUT SWITCH
HSI HOT SURFACE IGNITOR
HSIR HOT SURFACE IGNITOR RELAY
IDB INDOOR BLOWER
FS FLAME SENSOR
GV GAS VALVE
COMPONENT LEGEND
DS DOOR SWITCH
W
G
R
PVR
BLACK
GREEN
ORANGE
PINK
PURPLE
RED
W WHITE
Y YELLOW
G
O
PK
PU
R
BL BLUE
BR BROWN
B
IDBR1
IDBR2
HSI
COOL
HEAT
ROS
P.V.
GV
UNMARKED TERMINAL
MARKED TERMINAL
WIRE SPLICE
I.D.B.
B14933-230
3. MODEL GMT140-5 USES HIGH SPEED (BLK)
FOR HEATING AND COOLING.
2. WARNING: CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL.(105ºF).
NOTES
LOW VOLTAGE
FIELD INSTALLED POWER
FIELD INSTALLED CONTROL
LINE VOLTAGE
ROS
HSIR
WIRING
HSIR
FUSE
IDBR2
WIRE CODE
PVR
IDBR1
115 / 60 / 1
POWER SUPPLY
WIRING DIAGRAMS
GMT
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
FS
PSO
PSI
FS
GV
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
BL
HSI
W
B
DS
G
GV
B
G
Y
B
PS
T'STAT
P.V.
MOTOR
TO 115/1/60
POWER SUPPLY
UNIT
OPTIONAL CONDENSING
Y
P
W
B
BL
24V
BL
W
G
R
Y
Y
LS
W
R
W
G
R
BL
ROS
R
R
BL
R
B
W
P
7
4
1
TWIN
LIMIT
LIMIT
ROS
YY
5
8
6
9
R
2
3
R
G
W
P
W
NEUTRALS
FURNACE CHASSIS GND.
O
PRI
TRANS
FS
L2
IND
HSI
M2
M1
HEAT
COOL
BR
BR
IDB
*
CAPACITOR
G
MED
B
M2
M1
HEAT
COOL
LOW
BL
HIGH
*R
FIG # 1
B
BL
R
B
PS
LS
IDBR INDOOR BLOWER RELAY
LS LIMIT SWITCH
PS PRESSURE SWITCH
PV POWER VENTOR
PVR POWER VENT RELAY
ROS ROLLOUT SWITCH
FS FLAME SENSOR
GV GAS VALVE
HSI HOT SURFACE IGNITOR
HSIR HOT SURFACE IGNITOR RELAY
IDB INDOOR BLOWER
COMPONENT LEGEND
DS DOOR SWITCH
W
G
R
PVR
PVR
IDBR1
WIRING
WIRE CODE
W WHITE
Y YELLOW
GREEN
ORANGE
PINK
PURPLE
RED
B BLACK
BL BLUE
BR BROWN
G
O
PK
PU
R
IDBR1
IDBR2
HSI
COOL
HEAT
ROS
P.V.
GV
UNMARKED TERMINAL
MARKED TERMINAL
WIRE SPLICE
I.D.B.
C
4. ALL UNUSED MOTOR SPEED LEADS
GET PLACED ON M1 AND M2.
B14933-231
3. FOR MODEL GMT140-5, SEE FIG. # 1.
2. WARNING: CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL.(105ºF).
NOTES
LOW VOLTAGE
FIELD INSTALLED POWER
FIELD INSTALLED CONTROL
LINE VOLTAGE
ROS
HSIR
HSIR
FUSE
IDBR2
115 / 60 / 1
POWER SUPPLY
WIRING DIAGRAMS
GMT, GMTH, & GMTH A SERIES
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
FS
FS
GV
PSO
PSI
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
71
72
BL
HSI
W
B
DS
G
GV
B
G
Y
B
PS
T'STAT
P.V.
MOTOR
TO 115/1/60
POWER SUPPLY
UNIT
OPTIONAL CONDENSING
Y
P
W
B
BL
24V
BL
W
G
R
Y
Y
LS
W
R
W
G
R
BL
ROS
R
R
BL
R
B
W
P
7
4
1
TWIN
LIMIT
LIMIT
ROS
Y Y
8
R
5
9
2
6
3
R
G
W
P
NEUTRALS
FURNACE CHASSIS GND.
W
O
PRI
TRANS
FS
L2
BR
BR
IDB
*
BL
HIGH
LOW
MED
B
CAPACITOR
G
IND
HSI
M2
M1
HEAT
COOL
*
R
B
PS
LS
IDBR INDOOR BLOWER RELAY
LS LIMIT SWITCH
PS PRESSURE SWITCH
PV POWER VENTOR
PVR POWER VENT RELAY
ROS ROLLOUT SWITCH
FS FLAME SENSOR
GV GAS VALVE
HSI HOT SURFACE IGNITOR
HSIR HOT SURFACE IGNITOR RELAY
IDB INDOOR BLOWER
COMPONENT LEGEND
DS DOOR SWITCH
W
G
R
PVR
WIRING
BLACK
GREEN
ORANGE
PINK
PURPLE
RED
W WHITE
Y YELLOW
G
O
PK
PU
R
BL BLUE
BR BROWN
B
IDBR1
IDBR2
HSI
COOL
HEAT
ROS
P.V.
GV
UNMARKED TERMINAL
MARKED TERMINAL
WIRE SPLICE
I.D.B.
C
B14933-197
2. WARNING: CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL.(105ºF).
NOTES
LOW VOLTAGE
FIELD INSTALLED POWER
FIELD INSTALLED CONTROL
LINE VOLTAGE
ROS
HSIR
HSIR
FUSE
IDBR2
WIRE CODE
PVR
IDBR1
115 / 60 / 1
POWER SUPPLY
WIRING DIAGRAMS
GMT, GMTH
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
FS
PSO
GV
PSI
FS
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
B
BL
HSI
W
GV
P.V.
MOTOR
PS
(2)
B
THE LEADS FROM THE MOTOR
MAY BE CHANGED TO THE
REQUIRED SPEED.
DS
G
T'STAT
Y
W
G
R
Y
Y
B
ROS
G
24V
R
7
(4)
W
P
NEUTRALS
W
(5)
O
PRI
TRANS
FS
L2
BR
BR
IDB
CAPACITOR
IND
HSI
(6)
(7)
(9)
(8)
ALS
PS
LS
LS - LIMIT SWITCH
PS - PRESSURE SWITCH
IDBR - INDOOR BLOWER RELAY
HSI - HOT SURFACE IGNITOR
IDB - INDOOR BLOWER
GV - GAS VALVE
FS - FLAME SENSOR
DS - DOOR SWITCH
ALS - AUXILIARY LIMIT SWITCH
W
G
R
PVR
LO - RED
PV - POWER VENTER
ROS - ROLLOUT SWITCH
ALS
8
4
M2
M1
HEAT
COOL
PVR - POWER VENT RELAY
(3)
LS
W
9
5
6
1
TWIN
MED - BLUE
R
BL
2
3
R
G
W
FURNACE CHASSIS GND.
HI - BLACK
MED HI - YELLOW
MED LO - ORANGE
W
R
W
G
R
BL
FS
NOTE:
(1)
B
TO 115/1/60
POWER SUPPLY
UNIT
OPTIONAL CONDENSING
Y
ROS
WIRING CODE
HSIR
HSIR
FUSE
IDBR2
O
B
BL
G
BLUE (4)
GREEN (8)
ORANGE (6)
BLACK (1)
WIRE COLOR CODE
FACTORY WIRING
HIGH VOLTAGE
LOW VOLTAGE
PVR
FS
IDBR1
115 / 60 / 1
R
Y
P
W
POWER SUPPLY
I.D.B.
GV
P.V.
B25578-04
2. WARNING CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL
CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL
(105°C).
NOTES:
PURPLE (5)
WHITE (0)
YELLOW (3)
RED (2)
IDBR1
IDBR2
HSI
COOL
HEAT
WIRING DIAGRAMS
GPD, GDT, GDT A & B SERIES
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
73
74
HI
COM
LO
GV
G
HSI
DS
B
BLACK
BLUE
BROWN
GREEN
ORANGE
B
BL
BR
G
O
B
R
PK
W
Y
R
P
WIRE COLOR CODE
W
TO 115/1/60
POWER SUPPLY
OVERCURRENT
PROTECTION
DEVICE
THERMOSTAT
CONDENSING UNIT
Y
BL
P
Y
B
R
R
BL
PINK
PURPLE
WHITE
YELLOW
RED
BL
R
25
24
23
22
ROS
BL
24V
W
BR
G
31
W1
W2
G
LS
W
PS1
B
R
R
R
R
Y
W
ROS
Y
Y
PS3
P
P
P
Y P BL
8
7
11
10
9
R
12
G
W2
W1
4
5
2
3
FS
BL
O R O
1
SO
6
FURNACE CHASSIS GROUND.
17
O
PS2
NEUTRALS
W
O
PRI
TRANS
L2
W
IND LO
IND HI
HSI
HT. LO
BR
BR
IDB
B
HIGH
LOW
G
P.V.
MOTOR
R
MED
CAPACITOR
G
HT. MED
COOL
B
*
R
BL
B
DS
LS
ROS - ROLLOUT SWITCH
SO - STACK OVERTEMP
PVR - POWER VENT RELAY
PS2 - PRESSURE SWITCH HI FIRE
PV - POWER VENTER
PS1 - PRESSURE SWITCH LO FIRE
PS3 - PRESSURE SWITCH COMB. BOX
PCB - PRINTED CIRCUIT BOARD
LS - LIMIT SWITCH
GV - GAS VALVE
HSI - HOT SURFACE IGNITOR
IDB - INDOOR BLOWER
IDBR - INDOOR BLOWER RELAY
IGM - IGNITION MODULE
DS - DOOR SWITCH
FS - FLAME SENSOR
W2
W1
G
R
L2
PS1
PS2
IGM
IGM
IGM
IGM
IGM
LOW VOLTAGE
HIGH VOLTAGE
WIRING CODE
SO
FUSE
(ON IGM)
PS3
24V
115V
HSI
PVR (ON IGM)
ROS
PVR (ON IGM)
ROS
PV
GV
I.D.B.
B28578-09
2. WARNING CABINET MUST BE
PERMANENTLY GROUNDED TO
CONFORM TO N.E.C. & LOCAL
CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL
(105°C).
NOTES:
IDBR (ON IGM)
LO SPD.
HI SPD
COOL
HEAT - FIRST STAGE
HEAT - SECOND STAGE
L1
C
WIRING DIAGRAMS
GSM
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
BL
T'STAT
ROS
ROS
PS2
LS
P
7
4
SO
W
GV
PSI
P
O
MED LOW - ORANGE
* MED HI - YELLOW
R
8
9
LIMIT
P
Y
Y
R
W
5
6
LIMIT
P
PS1
W
B
W
R
BL
1
TWIN
PSO
THE LEADS FROM THE MOTOR
MAY BE CHANGED TO THE
REQUIRED SPEED.
P
B
G
P.V.
MOTOR
BL
R
2
3
R
G
W
FROM FURNACE
CHASSIS GROUND
NEUTRALS
FS
FS
NOTE:
GV
DS
G
B
24V
W
G
R
FS
HSI
W
B
TO 115/1/60
POWER SUPPLY
CONDENSING
UNIT
Y
W
G
R
W
PRI
TRANS
L2
BR
BR
IDB
MED
B
BL
*
R
HIGH
LOW
*
CAPACITOR
G
IND
HSI
M2
M1
HEAT
COOL
B
SO
PS1
LS
PVR
SO - STACK OVERTEMP SWITCH
ROS - ROLLOUT SWITCH
PVR - POWER VENT RELAY
PV - POWER VENTOR
PS2 - PRESSURE SWITCH, COMB. BOX
LS - LIMIT SWITCH
PS1 - PRESSURE SWITCH, FIRE
IDBR2 - INDOOR BLOWER COOL RELAY
IDBR1 - INDOOR BLOWER HEAT RELAY
IDB - INDOOR BLOWER
HSIR HOT SURFACE IGNITION RELAY
HSI - HOT SURFACE IGNITOR
GV - GAS VALVE
FS - FLAME SENSOR
DS - DOOR SWITCH
W
G
R
DS
PVR
FUSE
HSIR
BLACK
BLUE
BROWN
GREEN
ORANGE
B
BL
BR
G
O
(7)
(8)
(6)
(4)
(1)
WIRE COLOR CODE
FACTORY WIRING
HIGH VOLTAGE
LOW VOLTAGE
WIRING CODE
PS2
IDBR2
IDBR1
P
W
Y
R
PK
ROS
HSIR
ROS
IDBR1
WHITE
YELLOW
RED
PURPLE
PINK
I.D.B.
GV
P.V.
(0)
(3)
(2)
(5)
(9)
C
B28578-08
2. WARNING CABINET MUST BE
PERMANENTLY GROUNDED AND
CONFORM TO N.E.C. & LOCAL
CODES.
1. REPLACEMENT WIRE MUST
BE THE SAME SIZE AND TYPE
OF INSULATION AS ORIGINAL
(105°C).
NOTES:
HSI
COOL
HEAT
IDBR2
115 / 60 / 1
POWER SUPPLY
WIRING DIAGRAMS
GSMS
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
75
TWINNING DIAGRAMS
GSU & GSM
GVHI
PSI2
GND
N/U
N/U
GV
COM
STATUS
24VAC
TRNS
SEC
W1
W2
G
R
L1MI
3A ATO
TWIN
FURNACE 2
ISOLATION RELAY
NEUTRALS
PRI
TRNS
L2
INDUCER
LO
HI
HSI
LO
HI
MED
BLOWER
M1
W1
BLUE
W2
G
R
Y
WHITE
BROWN
GREEN
RED
F1
BLUE
FS
PSI
ISOLATION RELAY
N/U
PSO
PSO2
GVHI
PSI2
GND
N/U
N/U
N/U
FS
GV
PSO
PSI
L1MO
F1
COM
24VAC
STATUS
TRNS
SEC
W1
W2
G
R
L1MI
3A ATO
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
76
NOTE 1: MUST USE ONE SOURCE OF POWER FOR BOTH FURNACES.
FURNACE 1
TWIN
BLUE
PSO2
L1MO
ROOM THERMOSTAT
TWINNING DIAGRAM
GSU & GSMS
TWO-STAGE THERMOSTAT
NEUTRALS
PRI
TRNS
L2
INDUCER
HI
LO
HSI
LO
HI
MED
M1
BLOWER
CONDENSER
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
F1
ATO 3A
1
RED
WHITE
PSI
LIMO
AN1
NEUTRALS
PRI
TRNS
EAC
L2
BLK
HUM
IND
115V
HSI
M2
M1
HEAT
COOL
ISOLATION RELAY
BLUE
F1
G
R
GREEN
RED
W
WHITE
90
120
150
HUM
STATUS
TWIN
ATO 3A
FS
FURNACE 2
B18099-13
1012-933C
K3
LIMI
1
WHITE
BLUE
K5
K2
K4
K3
MUST USE ONE SOURCE OF POWER FOR BOTH FURNACES.
CANNOT BE USED WITH TWO-STAGE FURNACE APPLICATIONS.
FS
FURNACE 1
LIMI
NOTE 1:
2:
90
120
150
P3
R
G
W
P1
HUM
90+I
STATUS
N/U
TWIN
AN1
1012-83-9332x HSCI
P3
B18099-13
1012-933C
6
9
PSO
8
GV
5
P2
7
FS
4
2
3
1
90+O
R
LIMO
TWINNING WIRE
G
PSI
W
PSO
TO COOLING CONTACTOR
Y
P1
ROOM THERMOSTAT
90+I
CONDENSER 1
CONTACTOR
COIL
FS
6
9
GV
8
K1
P2
90+O
5
3
4
2
7
1
CONDENSER 2
CONTACTOR
COIL
NEUTRALS
1012-83-9332x HSCI
K4
TWINNING DIAGRAM
GMP, GMPX, GMPN, GMT, GMNT & GSMS
SINGLE-STAGE THERMOSTAT
N/U
K5
K2
K1
PRI
TRNS
EAC
L2
BLK
HUM
IND
115V
HSI
M2
M1
HEAT
COOL
TWINNING DIAGRAMS
GMP, GMPX, GMPN, GMT, GMNT, GSMS
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
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