16
SCHEMATICS
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.
TYPICAL SCHEMATIC
GMH8 ____** MODEL FURNACES
WR 50M56-289 INTEGRATED IGNITION CONTROL
.0005
3M
K4
K2
HI
HEAT
COOL
PARK
CIR
NEU
K5
GAS VALVE
HIGH
LIMIT
AUX
LIMIT
PRESSURE
SWITCH
FLAME
SENSOR
PROBE
IGNITOR
FP
IGN
GND
MV
MLV
PS
HLO
HLI
CIRCULATOR
BLOWER
XFMR
HOT
XFMR
NEU
24 VAC
TH
RO1
RO2
R
TR
C
Y
G
W
COMPRESSOR
CONTACTOR
COIL
THERMOSTAT
R
Y
G
W
INDUCER
IND
ELECTRONIC
AIR CLEANER
EAC
EAC
NEU
K6
ROLLOUT
SWITCH
K1
FACTORY
JUMPER
FACTORY
JUMPER
PSO
K2
K3
K3
LO
HEAT
COM
PM
HI
2-STAGE
K7
This schematic is for reference only. Not all wiring is as shown above. Always refer to the appropriate wiring diagram for the unit being serviced.
