Download Amana GUSA Technical information

Technical
Information
Model and Manufacturing
numbers listed in this manual.
MODEL
M/N
GUSA070BX35 P1233902F
GUSA090BX40 P1233904F
GUSA090BX50 P1233905F
40" 90% Gas Furnaces
GUSA___BX__
• Refer to Service Manual RS6600001 Rev. 2 for installation, operation, and troubleshooting information.
• All safety information must be followed as provided in
the Service Manual.
• Refer to the appropriate Parts Catalog for part number
information.
GUSA115BX50 P1233906F
GUSA070BX35 P1239502F
GUSA090BX40 P1239504F
GUSA090BX50 P1239505F
GUSA115BX50 P1239506F
GUSA070BX35 P1242002F
GUSA090BX40 P1242004F
GUSA090BX50 P1242005F
GUSA115BX50 P1242006F
DESI GN
This manual replaces RT6612003 Rev. 1 October 2001.
CE RTI FI E D
CE
R T I FI E D
REV. 2 - New models added to manual (standardized White-Rodgers
Sini Igniter).
Heating&Air Conditioning
®
Comfort. Quality. Trust.
This manual is to be used by qualified HVAC technicians only. Amana
does not assume any responsibility for property damage or personal injury
due to improper service procedures performed by an unqualified person.
RT6612003
Revision 2
February 2002
PRODUCT IDENTIFICATION
The model and manufacturing number are used for positive identification of component parts used in manufacturing.
When engineering and manufacturing changes take place where interchangeability of components are affected, the
manufacturing number will change.
It is very important to use the model and manufacturing numbers at all times when requesting service or parts information.
G
U
S
A 070 B X 35
Product Type
Airflow Capability
35: 1.5 - 3.5 Tons
G: Gas Furnace
40: 1.5 - 4.0 Tons
50: 2.0 - 5.0 Tons
Supply Type
U: Upflow/Horizontal
Additional Features
X: NOx Models
Furnace Type
S: 2-Stage Condensing (90%)
Design Series
B: Initial Design Series (Silicon Nitride Ignition System)
Model Family
A: Air Command 90 (40" Height)
WARNING
Nominal Input
070:
70,000 Btuh
090:
90,000 Btuh
115:
115,000 Btuh
IF REPAIRS ARE ATTEMPTED BY UNQUALIFIED PERSONS, DANGEROUS CONDITIONS (SUCH AS EXPOSURE TO ELECTRICAL SHOCK) MAY
RESULT. THIS MAY CAUSE SERIOUS INJURY OR DEATH.
AMANA WILL NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY
DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES. IF YOU PERFORM SERVICE ON YOUR OWN PRODUCT, YOU ASSUME RESPONSIBILITY
FOR ANY PERSONAL INJURY OR PROPERTY DAMAGE WHICH MAY RESULT.
CAUTION
2 Rev. 2
PRODUCT DIMENSIONS
GUSA___BX__
AIR
DISCHARGE
A
28 3/4
B
(DISCHARGE AIR)
3/4
3/4
2 1/2
20 3/16
C
AIR INTAKE PIPE
2" PVC
ALTERNATE
GAS SUPPLY
HOLE
1 1/2
14
2 1/16
VENT/FLUE PIPE
2" PVC
LEFT SIDE
DRAIN LINE
HOLES
23
DRAIN
TRAP
CL
LOW VOLTAGE
ELECTRICAL HOLE
1 3/4
SIDE CUT-OUT
ALTERNATE
AIR INTAKE LOCATION
STANDARD GAS
SUPPLY HOLE
2 11/16
7 3/8
HIGH VOLTAGE
ELECTRICAL HOLE
AIR
DISCHARGE
3/4
CONDENSATE
DRAIN TRAP
w/ 3/4" PVC
DISCHARGE
(RIGHT OR
LEFT SIDE)
1 3/4
30 1/4
40
24 9/16
27 1/8
2 5/8
21 1/4
ALTERNATE
VENT/FLUE
LOCATION
4 1/8
30 1/4
2 5/8
19 3/16
11 3/4
16 5/8
11 3/4
RIGHT SIDE
DRAIN LINE
HOLES
DRAIN
TRAP
CL
2
19 3/16
HIGH VOLTAGE
ELECTRICAL HOLE
6 1/8
LOW VOLTAGE
ELECTRICAL HOLE
32 13/16
1 3/4
SIDE CUT-OUT
1 5/8
1
D
BOTTOM KNOCK-OUT
23 9/16
BOTTOM KNOCK-OUT
LEFT SIDE
VIEW
RIGHT SIDE
VIEW
FRONT
VIEW
Cabinet
Size
Units
A
B
C
D
Small
070__35
16-1/2
15
12-3/8
12-5/8
Medium
090__40
20-1/2
19
16-3/8
14-5/8
Large
090__50
115__50
24-1/2
23
20-3/8
18-5/8
All dimensions are in inches.
GUSA___BX__ (Manufacturing Numbers P1239502-06F and P1242002-06F)
3 Rev. 2
PRODUCT DIMENSIONS
GUSA___BX__
AIR
DISCHARGE
A
28 3/4
3/4
2 1/2
20 3/16
AIR INTAKE PIPE
2" PVC
ALTERNATE
GAS SUPPLY
HOLE
LEFT SIDE
DRAIN LINE
HOLES
1 1/2
2 1/16
DRAIN
TRAP
CL
30 1/4
CONDENSATE
DRAIN TRAP
w/ 3/4" PVC
DISCHARGE
(RIGHT OR
LEFT SIDE)
40
27 1/8
6 1/8
SIDE CUT-OUT
19 3/16
2 5/8
19 3/16
2
1 3/4
ALTERNATE
VENT/FLUE
LOCATION
4 1/8
30 1/4
LOW VOLTAGE
ELECTRICAL HOLE
HIGH VOLTAGE
ELECTRICAL HOLE
ALTERNATE
AIR INTAKE LOCATION
STANDARD GAS
SUPPLY HOLE
2 11/16
23
14
VENT/FLUE PIPE
2" PVC
7 3/8
2 5/8
AIR
DISCHARGE
3/4
B
(DISCHARGE)
C
3/4
HIGH VOLTAGE
ELECTRICAL HOLE
11 3/4
16 5/8
11 3/4
9 3/8
RIGHT SIDE
DRAIN LINE
DRAIN
HOLES
TRAP
CL
LOW VOLTAGE
ELECTRICAL HOLE
32 13/16
7 7/8
1 3/4
SIDE CUT-OUT
1 5/8
1
D
BOTTOM KNOCK-OUT
23 9/16
BOTTOM KNOCK-OUT
LEFT SIDE
VIEW
RIGHT SIDE
VIEW
FRONT
VIEW
Cabinet
Size
Units
A
B
C
D
Small
070__35
16-1/2
15
12-3/8
12-5/8
Medium
090__40
20-1/2
19
16-3/8
14-5/8
Large
090__50
115__50
24-1/2
23
20-3/8
18-5/8
All dimensions are in inches.
GUSA___BX__ (Manufacturing Numbers P1233902-06F)
4 Rev. 2
COMPONENT IDENTIFICATION
6
5
7
8
7
9
10
BLOWER COMPARTMENT
BURNER COMPARTMENT
11
4
3
13
3
12
2
14
1
15
16
17 18
32
31 18
30
20
19
20
21
21
29
22
23
24
24 Volt Thermostat
Connections
Fuse
(3A)
12 Circuit
Connector
Intell-Ignition
Thermostat
Selection Jumper
(Single vs. Two -Stage)
Low to High
Stage Delay
DIP Switch
Heat OFF Delay
DIP Switches
5 Circuit
Connector
28
25
27
Diagnostic
Red LED
Circulator Blower, Transformer
and Accessory Quick Connects
26
Upflow/Horizontal
Integrated Control Module
1
Two-Stage Gas Valve
17 Two-Speed Induced Draft Blower
2
Gas Line Entrance (Alternate)
18 Electrical Connection Inlet (Alternate)
3
Pressure Switch(es)
19 Coil Front Cover Pressure Tap
4
Gas Manifold
20 Coil Front Cover Drain Tap
5
Combustion Air Intake Connection
21 Drain Line Penetrations
6
Hot Surface Igniter
22 Drain Trap
7
Rollout Limit
23 Blower Door Interlock Switch
8
Burners
24 Capacitor
9
Flame Sensor
25 Two-Stage Integrated Control Module
10 Flue Pipe Connection
(with fuse and diagnostic LED)
11 Flue Pipe
26 Transformer (40 VA)
12 Combustion Air Intake (Alternate)
27 Circulator Blower
13 Primary Limit
28 Bottom Return Filter Retainer
14 Gas Line Entrance
29 Auxiliary Limit
15 Flue Pipe Connection (Alternate)
30 Junction Box
16 Rubber Elbow
31 Electrical Connection Inlet
32 Coil Front Cover
GUSA___BX__ (Manufacturing Numbers P1239502-06F and P1242002-06F)
5 Rev. 2
COMPONENT IDENTIFICATION
6
BLOWER COMPARTMENT
BURNER COMPARTMENT
5
7
8
7
4
9
10
11
3
3
12
13
14 15
16
17
18
19
20
2
1
32
18
19
20
21
31
22
30
29
23
24 Volt Thermostat
Connections
Fuse
(3A)
12 Circuit
Connector
Intell-Ignition
Thermostat
Selection Jumper
(Single vs. Two -Stage)
Low to High
Stage Delay
DIP Switch
Heat OFF Delay
DIP Switches
5 Circuit
Connector
28
27
Diagnostic
Red LED
24
26
Circulator Blower, Transformer
and Accessory Quick Connects
25
Upflow/Horizontal
Integrated Control Module
1
Two-Stage Gas Valve
17 Two-Speed Induced Draft Blower
2
Gas Line Entrance (Alternate)
18 Coil Front Cover Pressure Tap
3
Pressure Switch(es)
19 Coil Front Cover Drain Tap
4
Gas Manifold
20 Drain Line Penetrations
5
Combustion Air Intake Connection
21 Drain Trap
6
Hot Surface Igniter
22 Capacitor
7
Rollout Limit
23 Electrical Connection Inlets (Alternate)
8
Burners
24 Two-Stage Integrated Control Module
9
Flame Sensor
(with fuse and diagnostic LED)
10 Flue Pipe Connection
25 Transformer (40 VA)
11 Flue Pipe (Internal)
26 Circulator Blower
12 Combustion Air Intake (Alternate)
27 Bottom Return Filter Retainer
13 Primary Limit
28 Blower Door Interlock Switch
14 Gas Line Entrance
29 Junction Box
15 Flue Pipe Connection (Alternate)
30 Electrical Connection Inlets
16 Rubber Elbow
31 Auxiliary Limit
32 Coil Front Cover
GUSA___BX__ (Manufacturing Numbers P1233902-06F)
6 Rev. 2
PRODUCT DESIGN
General Operation
This GUSA furnace is equipped with an electronic ignition
device used to light the burners and an induced draft blower to exhaust combustion products.
An interlock switch prevents furnace operation if the blower
door is not in place. Keep the blower access door in place
except for inspection and maintenance.
This furnace is also equipped with a self-diagnosing electronic control module. In the event a furnace component is
not operating properly, the control module LED will flash
on and off in a factory-programmed sequence, depending
on the problem encountered. This light can be viewed
through the observation window in the blower access door.
Refer to the Troubleshooting Chart for further explanation
of the LED codes and Abnormal Operation - Integrated Ignition Control section in the Service Instructions for an explanation of the possible problem.
The rated heating capacity of the furnace should be greater
than or equal to the total heat loss of the area to be heated.
The total heat loss should be calculated by an approved
method or in accordance with “ASHRAE Guide” or “Manual
J-Load Calculations” published by the Air Conditioning Contractors of America.
*Obtain from: American National Standards Institute 1430
Broadway New York, NY 10018
Location Considerations
•
The furnace should be as centralized as is practical
with respect to the air distribution system.
•
Do not install the furnace directly on carpeting, tile,
or combustible material other than wood flooring.
•
When suspending the furnace from rafters or joists,
use 3/8" threaded rod and 2” x 2” x 3/8” angle as
shown in the Installation and Service Instructions. The
length of the rod will depend on the application and
clearance necessary.
•
When installed in a residential garage, the furnace
must be positioned so the burners and ignition source
are located not less than 18 inches (457 mm) above
the floor and protected from physical damage by vehicles.
Notes:
1. Installer must supply one or two PVC pipes: one for
combustion air (optional) and one for the flue outlet (required). Vent pipe must be either 2” or 3” in diameter,
depending upon furnace input, number of elbows, length
of run and installation (1 or 2 pipes). The optional Combustion Air Pipe is dependent on installation/code requirements and must be 2” or 3” diameter PVC.
3. Conversion kits for high altitude natural or propane gas
operation are available. See High Altitude Derate chart
for details.
4. Installer must supply the following gas line fittings, depending on which entrance is used:
Left -- Two 90º Elbows, one close nipple, straight pipe.
Right -- Straight pipe to reach gas valve.
Accessibility Clearances (Minimum)
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
POSITION*
FRONT
SIDES
REAR
TOP
FLUE
FLOOR
Upflow
Horizontal
1
Alcove
0
6
0
0
1
4
0
0
C
C
* = All positioning is determined as installed unit is viewed from the front.
C = If placed on combustible floor, floor MUST be wood ONLY.
36" at front is required for servicing or cleaning.
Note: In all cases accessibility clearance shall take precedence over clearances from the enclosure where accessibility clearances are greater. All dimensions are given in
inches.
High Altitude Derate
When this furnace is installed at high altitude, the appropriate High Altitude orifice kit must be installed. This is required due to the natural reduction in the density of both
the gas fuel and combustion air as altitude increases. The
kit will provide the proper design certified input rate within
the specified altitude range.
PROPANE AND HIGH ALTITUDE KITS
MODEL
NUMBER
GUSA***BX**
0 to
7,000 ft.
7,001 to
11,000 ft.
HANG16
LPTK09
High Altitude
Propane
Conversion Kit Natural Gas Kit
(#55 Orifices) (#44 Orifices)
7,001 to
11,000 ft.
7,001 to
11,000 ft.
HALP13
High Altitude
LP Gas Kit
(#56 Orifices)
HAPS30
High Altitude Pressure
Switch Kit
High altitude kits are purchased according to the installation altitude and usage of either natural or propane gas.
Refer to the chart above for a tabular listing of appropriate
altitude ranges and corresponding manufacturer’s high altitude Natural Gas and Propane Gas kits. For a tabular listing of appropriate altitude ranges and corresponding
manufacturer's High Altitude Pressure Switch kits, refer to
either the Pressure Switch Trip Points & Usage Chart in
this manual or the Accessory Charts in Service Instructions.
2. Line voltage wiring can enter through the right or left
side of the furnace. Low voltage wiring can enter through
the right or left side of furnace.
7 Rev. 2
PRODUCT DESIGN
PRESSURE SWITCH TRIP POINTS AND USAGE CHART
MODEL
GUSA070BX35
GUSA090BX40
GUSA090BX50
GUSA115BX50
NEGATIVE
PRESSURE
ID BLOWER
WITH FLUE
NOT FIRING
TYPICAL SEA
LEVEL DATA
LOW
HIGH
FIRE
FIRE
NEGATIVE
PRESSURE
ID BLOWER
WITH FLUE
FIRING
TYPICAL SEA
LEVEL DATA
LOW
HIGH
FIRE
FIRE
NEGATIVE
PRESSURE
COIL COVER
WITH FLUE
NOT FIRING
TYPICAL SEA
LEVEL DATA
LOW
HIGH
FIRE
FIRE
NEGATIVE
PRESSURE
COIL COVER
WITH FLUE
FIRING
TYPICAL SEA
LEVEL DATA
LOW
HIGH
FIRE
FIRE
-0.35
-0.35
-0.55
-0.55
-0.70
-0.70
-0.65
-0.65
PRESSURE SWITCH TRIP POINTS AND USAGE CHART
0 to 7,000 ft.
TRIP POINT
COIL COVER
PRESSURE
SWITCH
LOW
HIGH
FIRE
FIRE
MODEL
GUSA070BX35
GUSA090BX40
GUSA090BX50
GUSA115BX50
-0.37
-0.37
COIL
COVER
PRESSURE
SWITCH
PART #
20197305
7,001 ft. to 11,000 ft.
TRIP POINT
ID BLOWER
PRESSURE
SWITCH
LOW
HIGH
FIRE
FIRE
-0.20
ID BLOWER
PS1
PRESSURE
LABEL
SWITCH
COLOR
PART #
-0.55
11177117
GREEN
PS2
LABEL
COLOR
TRIP POINT
COIL COVER
PRESSURE
SWITCH
LOW
HIGH
FIRE
FIRE
TRIP POINT
ID BLOWER
PRESSURE
SWITCH
LOW
HIGH
FIRE
FIRE
HIGH
ALTITUDE
KIT
PS1
LABEL
COLOR
PS2
LABEL
COLOR
PURPLE
-0.37
-0.15
HAPS30
11177119
YELLOW
PINK
-0.37
-0.46
Note: All installations above 7,000 ft. require a pressure switch change. For installations in Canada the GUSA furnace is certified only to 4500 feet.
Note: Replacement pressure switch number is listed below high altitude kit number.
Note: All negative pressure readings are in inches of water column (" w.c.).
T.O.D. PRIMARY LIMIT
ROLLOUT LIMIT SWITCHES
PART NUMBER
20162904
20162907
PART NUMBER
OPEN SETTING (°F)
150
155
OPEN SETTING (°F)
200
220
190
COLOR CODE(S)
BROWN
ORANGE
COLOR CODE(S)
GUSA070BX35
YELLOW
ORANGE
GRAY
GUSA070BX35
1
10123534
1
GUSA090BX40
GUSA090BX50
1
1
GUSA090BX50
2
GUSA115BX50
2
AUXILIARY LIMIT SWITCHES
PART NUMBER
10123535
OPEN SETTING (°F)
150
COLOR CODE(S)
GUSA070BX35
RED
GUSA090BX40
1
GUSA090BX50
1
GUSA115BX50
1
1
10123537
2
GUSA090BX40
GUSA115BX50
8 Rev. 2
10123533
2
PRODUCT DESIGN
Coil Matches:
A large array of Amana coils are available for use with the new GUSA furnaces, in either upflow or horizontal applications. These coils are available in both cased and uncased models, with or without a TXV expansion device. These new
90%+ furnaces match up with the existing Amana coils as shown in the chart below.
Btuh
Input
GUSA070BX35
CCA_F*C
Cased
A-Coils
CCA_FSC
Uncased
A-Coils
CHA_TCC
Cased
TXV A-Coils
2 - 3 1/2
CCA18FCC
CCA24FCC
CCA30FCC
CCA36FCC
CCA42FCC
CCA18FSC
CCA24FSC
CCA30FSC
CCA36FSC
CCA42FSC
CHA18TCC
CHA24TCC
CHA30TCC
CHA36TCC
CCA30FDC
CCA36FDC
CCA42FDC
CCA48FCC
CCA48FSC
CCA36FKC
CCA48FDC
CCA54FCC
CCA57FCC
CCA60FCC
CCA54FSC
CCA57FSC
CCA60FSC
Cabinet Air Flow
Width
(tons)
16 1/2"
GUSA090BX40
20 1/2"
2 1/2 - 4
GUSA090BX50
24 1/2"
3-5
GUSA115BX50
24 1/2"
3-5
CHA_TSC
Uncased
TXV A-Coils
CCF_F*C
Horiz.
A-Coils
CHF_TCC
Horiz.
A-Coils
CHA18TSC
CHA24TSC
CHA30TSC
CHA36TSC
CCF24FCC CHF18TCC
CCF30FCC CHF24TCC
CCF36FCC CHF30TCC
CHA42TCC
CHA42TSC
CCF24FDC
CCF36FDC CHF36TCC
CCF42FCC CHF42TCC
CCF48FCC
CHA48TCC
CHA54TCC
CHA57TCC
CHA60TCC
CHA48TSC
CHA54TSC
CHA57TSC
CHA60TSC
CCF48FDC
CHF48TCC
CCF60FCC
CHF60TCC
CCF61FCC
Coil Matches (for the Amana RSD units using R-410A):
Cabinet Air Flow
Width
(tons)
CA_FCA
Cased
A-Coils
CF_FCA
Horizontal
A-Coils
GUSA070BX35
16-1/2"
1-1/2 - 3
CA36FCA
CF30FCA
GUSA090BX40
20-1/2"
2-1/2 - 4
CA42FCA
CF36FCA
GUSA090BX50
24-1/2"
3-5
CA48FCA
CA57FCA
CF48FCA
CF60FCA
Btuh
Input
GUSA115BX50
24-1/2"
3-5
9 Rev. 2
PRODUCT DESIGN
Thermostats:
The following Amana Thermostats are suggested for use with the GUSA Furnace Models:
Thermostats
Thermostat
Man/Auto
Programmable
Cool
Heat
Batt. Powered
Batt. Bkup*
Shape
Color
1213411
Man. Changeover
No
1
2
No
No
Rectangular
White
1213407
Man. Changeover
Yes
2
2
No
No
Rectangular
White
1213406*
Man. Or Auto
Yes
2
3
No
Yes
Rectangular
White
*1213406 is the recommended model for the GUSA furnace when used with a heat pump in a fossil fuel application. It is NOT for use
with the GUSA as a sole heating source. 1213406 thermstats are 24V powered with battery backup.
Filters:
Filters are required with this furnace and must be provided by the installer. The filters used must comply with UL900 or
CAN/ULCS111 standards. Installing this furnace without filters will void the unit warranty.
This furnace has provisions for the installation of return air filters at the side and/or bottom return. The furnace will
accommodate the following filter sizes depending on cabinet size:
Side Return(s)
Bottom Return
Cabinet
Width
(in.)
Nominal
Filter Size
(in.)
Approx.
Flow Area
2
(in )
All
16 x 25 x 1
400
Approx.
Cabinet N o m i n a l
Width Filter Size Flow Area
2
(in.)
(in.)
(in )
16-1/2 14 x 25 x 1
20-1/2 16 x 25 x 1
24-1/2 20 x 25 x 1
350
400
500
Refer to Minimum Filter Area tables to determine filter area requirement. NOTE: Filters can also be installed elsewhere
in the duct system such as a central return.
Cooling Airflow Requirement
(CFM)
Cooling Airflow Requirement
(CFM)
800 1000 1200 1400 1600 2000
070__35 564* 564* 564*
GUSA___BX__
Model
(Input__Airflow)
672
---
---
752* 752* 752* 768
---
090__40
---
090__50
---
---
752*
752*
768
960
115__50
---
---
940*
940*
940*
960
*Minimum filter area dictated by heating airflow requirement.
2
800 1000 1200 1400 1600 2000
070__35 282* 282* 282* 336
GUSA___BX__
Model
(Input__Airflow)
---
376* 376* 376* 384
---
090__40
---
---
090__50
---
---
376*
376*
384
480
115__50
---
---
470*
470*
470*
480
*Minimum filter area dictated by heating airflow requirement.
Disposable Minimum Filter Area (in )
Permanent Minimum Filter Area (in 2)
[Based on a 300 ft/min filter face velocity]
[Based on 600 ft/min filter face velocity]
10 Rev. 2
FURNACE SPECIFICATIONS
MODEL
GUSA070BX35
GUSA090BX40
GUSA090BX50
GUSA115BX50
Btuh Input (US) High Fire
69,000
92,000
92,000
115,000
Output (US) High Fire
65,200
87,300
86,000
109,100
Btuh Input (US) Low Fire
48,000
64,000
64,000
80,000
Output (US) Low Fire
45,200
60,000
59,800
76,100
A.F.U.E.
92.0%
92.0%
92.0%
92.0%
Rated External Static (" w.c.)
.10 - .50
.10 - .50
.10 - .50
.10 - .50
Temperature Rise (°F)
35 - 65
35 - 65
35 - 65
35 - 65
High Stage Pressure Switch Trip Point (" w.c.)
-0.55
-0.55
-0.55
-0.55
Low Stage Pressure Switch Trip Point (" w.c.)
-0.20
-0.20
-0.20
-0.20
Front Cover Pressure Switch Trip Point (" w.c)
-0.37
-0.37
-0.37
-0.37
Blower Wheel (D" x W")
11 x 7
11 x 9
11 x 10
11 x 10
1/2
1/2
3/4
1/2
Blower Horsepower
Blower Speeds
4
4
4
4
1407
1544
2017
1976
115-60-1
115-60-1
115-60-1
115-60-1
Minimum Circuit Ampacity (MCA)
8.7
6.4
11.1
9.8
Maximum Overcurrent Device
15.0
15.0
15.0
15.0
Transformer (VA)
40
40
40
40
Heat Anticipator (Amps)
0.7
0.7
0.7
0.7
Primary Limit Setting (°F)
155
150
150
150
Auxiliary Limit Setting (°F)
150
150
150
150
Rollout Limit Setting (°F)
200
190
220
220
30 secs.
30 secs.
30 secs.
30 secs.
90 secs.
90 secs.
90 secs.
90 secs.
5 sec.
5 sec.
5 sec.
5 sec.
45 secs.
45 secs.
45 secs.
45 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
Number of Burners
3
4
4
5
Vent Connector Diameter (inches)
2
2
2
2
Combustion Air Connector Diameter (inches)
2
2
2
2
145
167
175
188
Max CFM @ 0.5 E.S.P.
Power Supply
Fan Delay On Heating
Off Heating *
Fan Delay On Cooling
Off Cooling
Gas Supply Pressure (Natural/Propane) (" w.c.)
Manifold Pressure (Natural/Propane) (" w.c.)
Orifice Size (Natural/Propane)
Shipping Weight (lbs.)
* Off Heating - This fan delay timing is adjustable (60, 90, 120 or 180 seconds), 90 seconds as shipped.
1. These furnaces are manufactured for natural gas operation. Optional kits are available for conversion to propane
operation.
2. For elevations above 2000 feet the rating should be reduced by 4% for each 1000 feet above sea level. The furnace
must not be derated, orifice changes should only be made if necessary for altitude.
3. The total heat loss from the structure as expressed in TOTAL BTU/HR must be calculated by the manufacturers
method or in accordance with the "A.S.H.R.A.E. GUIDE" or "MANUAL J-LOAD CALCULATIONS" published by the
AIR CONDITIONING CONTRACTORS OF AMERICA. The total heat loss calculated should be equal to or less than
the heating capacity. Output based on D.O.E. test procedures, steady state efficiency times output.
4. Minimum Circuit Ampacity calculated as: (1.25 x Circulator Blower Amps) + I.D. Blower Amps.
11 Rev. 2
BLOWER PERFORMANCE SPECIFICATIONS
GUSA***BX** Blower Performance
(CFM & Temperature Rise vs. External Static Pressure)
External Static Pressure, (Inches Water Column)
Tons
AC
at
0.5"
ESP
CFM
Low
Fire
Rise
High
Fire
Rise
CFM
Low
Fire
Rise
High
Fire
Rise
CFM
Low
Fire
Rise
HIGH
3.5
1621
---
37
1572
---
38
1521
---
39
1469
MED
3.0
1402
---
42
1366
---
43
1329
---
45
1290
MED-LOW
2.5
1144
36
52
1122
37
53
1086
38
55
LOW
2.0
868
48
---
831
50
---
805
51
---
Model
(
Heating Speed
As Shipped
)
GUSA070BX35
(
)
HIGH FIRE: MED-LO
LOW FIRE: LOW
0.3
0.4
High
Low
Fire CFM Fire
Rise
Rise
0.5
0.6
0.7
0.8
High
Fire
Rise
CFM
Low
Fire
Rise
---
40
1407
---
42
1343 1276 1205
---
46
1243
---
48
1185 1133 1060
1063
39
56
1024
40
58
981
940
875
782
53
---
745
55
---
703
667
619
High
Fire CFM CFM CFM
Rise
4.0
1821
30
44
1768
31
45
1699
32
47
1624
34
49
1544
36
51
1439 1354 1227
3.5
1624
34
49
1561
35
51
1520
36
52
1461
38
54
1381
40
57
1297 1217 1109
HIGH FIRE: MED
MED-LOW
3.0
1395
40
57
1363
40
58
1311
42
60
1258
44
63
1201
46
---
1120 1045
957
LOW FIRE: LOW
LOW
2.5
1212
45
65
1164
47
---
1126
49
---
1080
51
---
1014
54
---
957
815
HIGH
5.0
2090
---
38
2076
---
38
2061
---
38
2054
---
39
2017
---
39
1963 1901 1820
1523 1473 1410
)
)
HIGH FIRE: MED-LO
LOW FIRE: LOW
GUSA115BX50
(
0.2
HIGH
GUSA090BX50
(
0.1
MED
GUSA090BX40
(
Motor
Speed
882
MED
4.5
1615
---
49
1610
---
49
1600
---
50
1591
---
50
1562
35
51
MED-LOW
3.5
1367
40
58
1367
40
58
1356
41
58
1351
41
59
1345
41
59
1298 1252 1177
LOW
3.0
1191
46
---
1182
47
---
1166
47
---
1141
48
---
1115
49
---
1061 1014
HIGH
5.0
2181
---
45
2117
---
47
2073
---
48
2021
---
49
1976
---
50
1913 1831 1746
965
MED
4.5
1693
41
58
1666
41
59
1647
42
60
1600
43
62
1562
44
63
1522 1471 1408
HIGH FIRE: MED
MED-LOW
3.5
1489
46
---
1454
47
---
1428
48
---
1397
49
---
1365
50
---
1328 1270 1214
LOW FIRE: LOW
LOW
3.0
1299
53
---
1275
54
---
1250
55
---
1224
56
---
1188
58
---
1161 1105 1059
)
1. Blower speeds for each firing rate are set independently of each other.
2. CFM in chart is without filters(s). Filters do not ship with this furnace, but must be provided by the installer. If the
furnace requires two return filters, this chart assumes both filters are installed.
3. All furnaces ship as high speed cooling. Installer must adjust blower cooling speed as needed.
4. For most jobs, about 400 CFM per ton when cooling is desirable.
5. INSTALLATION IS TO BE ADJUSTED TO OBTAIN TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON
THE RATING PLATE.
6. The chart is for information only. For satisfactory operation, external static pressure must not exceed value shown
on rating plate. The shaded area indicates ranges in excess of maximum external static pressure allowed when
heating. The data for 0.6" w.c. to 0.8" w.c. is shown for air conditioning purposes only.
7
The dashed (---) areas indicate a temperature rise not recommended for this model.
8. The above chart is for U.S. furnaces installed at 0-4000 feet. At higher altitudes, a properly derated unit will have
approximately the same temperature rise at a particular CFM, while the ESP at that CFM will be lower.
12 Rev. 2
TEMPERATURE RISE
10
20
30
40
50
60
70
30
80
90
100
40
50
60
700
600 CFM
90
100
2000
2200
2400 CFM
1800
1600
1400
OUTPUT BTU/HR x 1000
80
1200
1100
1000
900
70
800
FORMULAS
110
120
130
140
BTU OUTPUT = CFM x 1.08 x RISE
BTU OUTPUT
RISE =
÷ CFM
1.08
BTU OUTPUT vs TEMPERATURE RISE CHART
150
BLOWER PERFORMANCE SPECIFICATIONS
13 Rev. 2
WIRING DIAGRAMS
HI
VT-25
RD-2
WH-33
3
C 2
TWO STAGE
GAS VALVE
C
PM 1
FLAME
SENSOR
GY
-12
GY-47
NO
NO
LOW FIRE
PRESS.
SWITCH
BU-12
OR-15
BU-36
PK
-17
L
AUTO RESET PRIMARY
LIMIT CONTROL
VT-28
VT-25
1
JUNCTION BOX
GN
2
GND
LINE-H
LINE-N
EAC-H
HI
HEAT-H
VT-28
BLOWER COMPARTMENT
PK-30
11
12
7
8
9
4
5
6
BU-12
GY-12
2
COOL-H
IND HI
HUM-H
GY-8
BU-36
IGN-N
HOT SURFACE
IGNITER
FP (3)
VT-25
YL-20
HUM-N
IGN-H
OR-15
3
IND-N
ID
BLWR
IND LO
HUMIDIFIER
BR-13
1
CIR-N
CIRCULATOR
BLWR
PK-30
10
INTEGRATED CONTROL MODULE
TWIN/
DEHUM
W2
W1
R
B/C
G
Y
YLO
O
RD-2
WH-33
BK-3
RD-15
WH-7
BR-13
24 V THERMOSTAT CONNECTIONS
24 V
3A
LO
HEAT
-H
INTEGRATED CONTROL MODULE
PK-30
VT-28
YL-20
MANUAL RESET
AUXILIARY
LIMIT CONTROL
EAC-N
ELECTRONIC
AIR CLEANER
BURNER COMPARTMENT
FUSE
N
DISCONNECT
INDUCED
DRAFT
BLOWER
WH
RD
BK
GND
WARNING:
DISCONNECT POWER
BEFORE SERVICING.
WIRING TO UNIT
MUST BE PROPERLY
POLARIZED AND
GROUNDED.
CHASSIS GROUND
RD
-18
MANUAL RESET ROLLOUT
LIMIT CONTROLS
3
WARNING:DISCONNECT POWER BEFORE
SERVICING.WIRING TO UNIT MUST BE
PROPERLY POLARIZED AND GROUNDED.
TO 115VAC/ 1Ø /60 HZ POWER SUPPLY WITH
OVERCURRENT PROTECTION DEVICE
C
FRONT COVER
PRESSURE SWITCH
BU
-27
JUCTION
BOX
BR-13
FLAME SENSOR
115 VAC
XFMR-H
GN
XFMR-N
OR-10
VT-28
T-STAT SELECTOR
2
HEAT OFF DELAY
DIP SWITCHES
PK-30
RD-2
BK-3
2
3
5
DIAGNOSTIC
LED
4
OR10
GY
-8
3
24
VAC
115
VAC
BK-31
LINE
XFMR
EAC
CIRC
HUM
HUM
XFMR
LINE
PARK
COOL
EAC
HI
HEAT
LO
HEAT
HOT
HLO (11)
W1
40 VA
TRANSFORMER
24V THERMOSTAT CONNECTIONS
4
WH-33
NEUTRAL
WH-32
BK-4
WH
WH-5
WH-33
CIRCULATOR
BLOWER
3
4
4 FLASHES = THERMAL PROTECTIVE DEVICE OPEN
6
6 FLASHES = 115 VOLT AC POWER REVERSED
7 FLASHES = LOW FLAME SENSE SIGNAL
1
2
7
9
8 FLASHES = CHECK IGNITER OR IMPROPER GROUNDING
9 FLASHES = HIGH FIRE PRESSURE SWITCH STUCK OPEN
C
CONTINUOUS FLASHES = UNANTICIPATED FLAME PRESENT
8
COLOR CODES:
YL YELLOW
OR ORANGE
VT VIOLET
GN GREEN
BK BLACK
PK
BR
WH
BU
GY
RD
PINK
BROWN
WHITE
BLUE
GRAY
RED
20339801 REV.00
PS1 (12)
C
NO
FRONT COVER
PRESSURE SWITCH
C
MVL(7)
LOW FIRE
PRESSURE
SWITCH
NO
PM
C
5
PS2 (2)
BLOWER
COMPARTMENT
DOOR SWITCH
(OPEN WHEN
DOOR OPEN)
STEADY ON = REPLACE CONTROL
1 FLASH = SYSTEM LOCKOUT (RETRIES/RECYCLES EXCEEDED)
2 FLASHES = LOW FIRE PRESSURE SWITCH STUCK CLOSED
3 FLASHES = LOW FIRE PRESSURE SWITCH STUCK OPEN
0
TO
MICRO
G
MVH (1)
NO
HI
C
BK-4
CHASSIS
GROUND
Y
BK-1
RD (LOW)
W2
7
BU (MED)
OR (MED-LO)
MANUAL RESET ROLLOUT
LIMIT CONTROL(S)
HL1 (6)
6
BK (HI)
CAPACITOR
AUTO RESET
PRIMARY LIMIT
MANUAL RESETCONTROL
AUXILIARY
LIMIT CONTROL
24 VAC
FUSE 3 A
9 CIRCUIT CONNECTOR
RD-15
WH-7
TWO-STAGE
INTEGRATED
CONTROL
MODULE
5 CIRCUIT
CONNNECTOR
1
TH (5)
R
1
40 VA
TRANSFORMER
MVC (8)
HIGH FIRE
PRESSURE SWITCH
GND (10)
TR (9)
GND
C
GAS
VALVE
INTEGRATED CONTROL MODULE
LOW VOLTAGE (24V)
LOW VOLTAGE FIELD
HI VOLTAGE (115V)
EQUIPMENT GND
FIELD GND
FIELD SPLICE
HI VOLTAGE FIELD
SWITCH (TEMP.)
JUNCTION
TERMINAL
INTERNAL TO
INTEGRATED CONTROL
PLUG CONNECTION
IGNITER
SWITCH (PRESS.)
OVERCURRENT
PROT. DEVICE
NOTES:
1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.
2. MANUFACTURER'S SPECIFIED REPLACEMENT PARTS MUST BE USED WHEN SERVICING.
3. IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUST BE
REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE
RATING OF AT LEAST 105°C. USE COPPER CONDUCTORS ONLY.
4. UNIT MUST BE PERMANENTLY GROUNDED AND CONFORM TO N.E.C. AND LOCAL CODES.
GUSA___BX__ (Manufacturing Numbers P1239502-06F and P1242002-06F)
14 Rev. 2
TO AVOID POSSIBLE ELECTRICAL SHOCK, PERSONAL INJURY,
OR DEATH, DISCONNECT THE POWER BEFORE SERVICING.
1
C
NO
OR-22
2 CIRCUIT
CONNECTOR
YL-20
2
HIGH FIRE
PRESS. SWITCH
! WARNING
HOT
SURFACE
IGNITER
TO 115VAC/ 1Ø / 60 HZ
POWER SUPPLY WITH
OVERCURRENT PROTECTION
DEVICE
ID BLOWER
TWO-STAGE PRESSURE
SWITCH ASSEMBLY
WIRING DIAGRAMS
ID BLOWER
TWO-STAGE PRESSURE
SWITCH ASSEMBLY
NO
OR-22
2 CIRCUIT
CONNECTOR
HI
RD-2
WH-33
C
TWO STAGE
GAS VALVE
3
VT-25
2
BR-13
C
PM 1
NO
N
DISCONNECT
FLAME
SENSOR
GY
-12
GY-47
GND
WARNING:
DISCONNECT POWER
BEFORE SERVICING.
WIRING TO UNIT
MUST BE PROPERLY
POLARIZED AND
GROUNDED.
C
YL-20
1
L
HIGH FIRE
PRESS. SWITCH
HOT
SURFACE
IGNITER
2
TO 115VAC/ 1Ø /60 HZ POWER SUPPLY WITH
OVERCURRENT PROTECTION DEVICE
C
NO
OR-15
1
BK
GN
WH
RD
HI
HEAT-H
INDUCED
DRAFT
BLOWER
VT-25
2
GND
BURNER COMPARTMENT
LO
HEAT
-H
INDOOR
AIR
CIRCULATOR
BLWR
CIR-N
COOL-H
IND HI
IND-N
ID
BLWR
IND LO
HUM-N
HUM-H
HUMIDIFIER
VT-28
BLOWER COMPARTMENT
EAC-N
ELECTRONIC
AIR CLEANER
IGN-N
IGN-H
PK-30
TWIN/
DEHUM
W2
R
W1
G
FLAME SENSOR
PK-30
10
11
12
7
8
9
4
5
6
GY-8
OR-15
2
BU-36
3
VT-25
YL-20
GN
OR-10
VT-28
T-STAT SELECTOR
HEAT OFF DELAY
DIP SWITCHES
PK-30
1
BK-3
2
3
WH-7
4
WH-33
5
DIAGNOSTIC
LED
4
GY
-8
OR10
24
VAC
115
VAC
BK-31
LINE
XFMR
EAC
CIRC
HUM
HUM
XFMR
LINE
PARK
COOL
EAC
HI
HEAT
LO
HEAT
HOT
3
9 CIRCUIT CONNECTOR
RD-15
5 CIRCUIT
CONNNECTOR
RD-2
2
1
40 VA
TRANSFORMER
HLO (11)
W1
24V THERMOSTAT CONNECTIONS
1
AUTO RESET
24 VAC
PRIMARY LIMIT
MANUAL RESETCONTROL
AUXILIARY
LIMIT CONTROL
FUSE 3 A
BR-13
MANUAL RESET ROLLOUT
LIMIT CONTROL(S)
HL1 (6)
W2
TO
MICRO
Y
PS1 (12)
G
WH-32
LOW FIRE
PRESSURE
SWITCH
NO
MVL(7)
C
PM
C
MVH (1)
NO
HI
C
PS2 (2)
MVC (8)
HIGH FIRE
PRESSURE SWITCH
GND (10)
C
GAS
VALVE
GND
TR (9)
INTEGRATED CONTROL MODULE
WH
WH-5
CIRCULATOR
BLOWER
C
NO
FRONT COVER
PRESSURE SWITCH
NEUTRAL
BK-4
XFMR-N
40 VA
TRANSFORMER
TH (5)
R
BU-12
GY-12
115 VAC
XFMR-H
PK-30
RD-2
WH-33
BK-3
RD-15
B/C
Y
YLO
O
WH-7
24 V
3A
TWO-STAGE
INTEGRATED
CONTROL
MODULE
FP (3)
BR-13
24 V THERMOSTAT CONNECTIONS
HOT SURFACE
IGNITER
VT-28
YL-20
MANUAL RESET
AUXILIARY
LIMIT CONTROL
FUSE
INTEGRATED CONTROL MODULE
3
VT-28
LINE-N
EAC-H
INTEGRATED CONTROL MODULE
AUTO RESET PRIMARY
LIMIT CONTROL
BU-36
PK
-17
BU-12
BU
-27
JUNCTION BOX WITH BLOWER
COMPARTMENT DOOR SWITCH
LINE-H
LOW FIRE
PRESS.
SWITCH
WH-33
WARNING:DISCONNECT POWER BEFORE
SERVICING.WIRING TO UNIT MUST BE
PROPERLY POLARIZED AND GROUNDED.
WH-5
7
6
BK-4
N
BU (MED)
OR (MED-LO)
RD (LOW)
CAPACITOR
STEADY ON = REPLACE CONTROL
1
1 FLASH =
2
2 FLASHES = LOW FIRE PRESSURE SWITCH STUCK CLOSED
3
3 FLASHES = LOW FIRE PRESSURE SWITCH STUCK OPEN
4
4 FLASHES = THERMAL PROTECTIVE DEVICE OPEN
6
6 FLASHES = 115 VOLT AC POWER REVERSED
7
7 FLASHES = LOW FLAME SENSE SIGNAL
8
8 FLASHES = CHECK IGNITER OR IMPROPER GROUNDING
9
9 FLASHES = HIGH FIRE PRESSURE SWITCH STUCK OPEN
C
CONTINUOUS FLASHES = UNANTICIPATED FLAME PRESENT
PK PINK
BR BROWN
WH WHITE
BU BLUE
GY GRAY
RD RED
20299701 REV.00
L
DISCONNECT
LOW VOLTAGE (24V)
SYSTEM LOCKOUT (RETRIES/RECYCLES EXCEEDED)
GND
BK
-1
CHASSIS
GROUND
0
COLOR CODES:
YL YELLOW
OR ORANGE
VT VIOLET
GN GREEN
BK BLACK
JUNCTION BOX WITH BLOWER
COMPARTMENT DOOR SWITCH
(OPEN WHEN DOOR IS OPEN)
EQUIPMENT GND
LOW VOLTAGE FIELD
HI VOLTAGE (115V)
FIELD GND
FIELD SPLICE
HI VOLTAGE FIELD
SWITCH (TEMP.)
JUNCTION
TERMINAL
INTERNAL TO
INTEGRATED CONTROL
PLUG CONNECTION
TO 115 VAC/ 1Ø / 60 HZ
POWER SUPPLY WITH
OVERCURRENT PROTECTION
DEVICE
5
BK (HI)
TO AVOID POSSIBLE ELECTRICAL SHOCK, PERSONAL INJURY,
OR DEATH, DISCONNECT THE POWER BEFORE SERVICING.
MANUAL RESET ROLLOUT
LIMIT CONTROLS
CHASSIS GROUND
RD
-18
IGNITER
SWITCH (PRESS.)
OVERCURRENT
PROT. DEVICE
NOTES:
1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.
2. MANUFACTURER'S SPECIFIED REPLACEMENT PARTS MUST BE USED WHEN SERVICING.
3. IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUST BE
REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE
RATING OF AT LEAST 105°C. USE COPPER CONDUCTORS ONLY.
4. UNIT MUST BE PERMANENTLY GROUNDED AND CONFORM TO N.E.C. AND LOCAL CODES.
! WARNING
FRONT COVER
PRESSURE SWITCH
GUSA___BX__ (Manufacturing Numbers P1233902-06F)
15 Rev. 2
16 Rev. 2
TYPICAL SCHEMATIC
GUSA___BX__ MODEL FURNACES
WR 50M61-288 INTEGRATED IGNITION CONTROL
This schematic is for reference only. Not all wiring is as shown above,
refer to the appropriate wiring diagram for the unit being serviced.
! WARNING
IGNN
1M
.0005
IGN
K1
C
PARK
K6
W8
H1
P
M
MV MVL
COM
COOL
2 STAGE
GAS VALVE
GND
Q22
K2
HIGH
HEAT
HLO
HIGH
LIMIT
PS1
2ND STAGE
PRESSURE
SWITCH
PS2
CIRC.
NEU
EAC
NEU
1ST STAGE
PRESSURE
SWITCH
ROLLOUT
SWITCH
EAC
ELECTRONIC
AIR CLEANER
TO AVOID POSSIBLE ELECTRICAL SHOCK, PERSONAL INJURY,
OR DEATH, DISCONNECT THE POWER BEFORE SERVICING.
IGNITOR
FP
FLAME
SENSOR
PROBE
LINE NEU
120 VAC
LINE HOT
K7
LOW
HEAT
CIRCULATOR
BLOWER
K3
IND
HI
AUX
LIMIT
K8a
IND
LO
HLI
HUMIDIFIER
MVH
K8b
IND
NEU HUM
INDUCER
FUSE
HUMN
Y
G
W2
W1
B/C
TR
XFMRN
XFMR
TH
R
Y
G
W2
W1
R
THERMOSTAT
24 V.A.C.
SCHEMATICS