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WIRING DIAGRAMS
GMH8
WARNING:DISCONNECT POWER BEFORE
SERVICING.WIRING TO UNIT MUST BE
PROPERLY POLARIZED AND GROUNDED.
INTEGRATED
CONTROL MODULE
HUMIDIFIER
XFMR (6)
GND
GND (8)
24 VAC
HUMIDIFIER
C2
MVC (9)
HI
MVH (12)
G
R
W
Y
5 MIN
2 STG
MODE
BR
7
8
4
5
6
1
2
3
24V THERMOSTAT CONNECTIONS
C
BL
AUXILIARY
LIMITS
BR
INTEGRATED
CONTROL MODULE
M1
MVL (2)
C
ID BLOWER
PRESSURE
SWITCH
G
PS (10)
NO
C
PSO (4)
TO
MICRO HLI (7)
Y
W
HLO (1)
R
RO2 (11)
RO1 (5)
XFMR (3)
24 VAC
RD
RD
40 VA
TRANSFORMER
BR
BL
GAS
VALVE
RD
PU
XFMR-H
115 VAC
XFMR-N
FLAME SENSOR
OR
2
YL
YL
1
FP
BK
BK
24V
BL
IND-N
CIRCULATOR
BLWR
BK
15 PIN PLUG
ON SOME MODELS
GR
ID
BLWR
IND
EAC-H
BLOWER COMPARTMENT
ELECTRONIC
AIR CLEANER
LINE-N
JUNCTION BOX
BK
WH
DOOR
SWITCH
24 VAC
HUMIDIFIER
DOOR SWITCH
SWITCH LOCATED IN BLOWER
COMPARTMENT ON SOME MODELS
NO
EAC-N
LINE-H
BURNER COMPARTMENT
C
OR
RD
CIR-N
CAP
BR
WH
BR
BR
CICULATOR
BLOWER
BR
115V
XFMR
IGN-N
INTEGRATED CONTROL MODULE
PARK
INTEGRATED CONTROL MODULE
BK (HI)
BL (MED)
OR(MED LOW)
RD (LOW)
WH (N)
WH
PU
RD
YL
WH
WH
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.
HOT SURFACE
IGNITER
IGN
PRIMARY LIMIT
PRESSURE
SWITCH
DISCONNECT
YL
RD
YL
YL
WH
BK
L
GND
N
TO 115VAC/ 1
Ø /60 HZ POWER SUPPLY WITH
OVERCURRENT PROTECTION DEVICE
BR
BL
BR
PM C
1
2
HOT
SURFACE
IGNITER
BK
HI
3
JUNCTION
BOX
WH
2 STAGE
GAS VALVE
LINE-N
GND
LINE H
PU
INDUCED DRAFT
BLOWER
PU
PU
FLAME
SENSOR
ROLLOUT LIMITS
(SINGLE CONTROL ON SOME MODELS)
0
TO 115 VAC/ 1/60HZ
POWER SUPPLY WITH
OVERCURRENT PROTECTION
DEVICE
STEADY ON = NORMAL OPERATION
OFF
LOW VOLTAGE (24V)
= CONTROL FAILURE
1
1 FLASH =
2
2 FLASHES = PRESSURE SWITCH STUCK CLOSED
3
3 FLASHES = PRESSURE SWITCH STUCK OPEN
4
4 FLASHES = OPEN HIGH LIMIT
5
5 FLASHES = FLAME SENSE WITHOUT GAS VALVE
6
6 FLASHES = OPEN ROLLOUT OR OPEN FUSE
SYSTEM LOCKOUT (RETRIES/RECYCLES EXCEEDED)
7 FLASHES = LOW FLAME SIGNAL
8
8 FLASHES = CHECK IGNITER OR IMPROPER GROUND
C
RAPID FLASHES = REVERSED 115 VAC POLARITY/VERIFY GND
PK PINK
BR BROWN
WH WHITE
BL BLUE
GY GRAY
RD RED
HI VOLTAGE (115V)
EQUIPMENT GND
FIELD GND
FIELD SPLICE
HI VOLTAGE FIELD
SWITCH (TEMP.)
7
COLOR CODES:
YL YELLOW
OR ORANGE
PU PURPLE
GR GREEN
BK BLACK
LOW VOLTAGE FIELD
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. BLOWER SPEEDS SHOULD BE ADJUSTED BY INSTALLER TO MATCH THE INSTALLATION
REQUIREMENTS SO AS TO PROVIDE THE CORRECT HEATING TEMPERATURE RISE AND THE
CORRECT COOLING CFM. (SEE SPEC SHEET FOR AIR FLOW CHART)
5. UNIT MUST BE PERMANENTLY GROUNDED A ND CONFORM TO N.E.C. AND LOCAL CODES.
6. TO RECALL THE LAST 5 FAULTS, MOST RECENT TO LEAST RECENT, DEPRESS SWITCH
FOR MORE THAN 2 SECONDS WHILE IN STANDBY(NO THERMOSTAT INPUTS).
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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