17
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
GDH8 ____X* MODEL FURNACES
WR 50M56-289 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 be
ing serviced.
.0
0
0
5
3M
K4
K2
HI
H
EAT
CO
O
L
PA
RK
CI
R
NE
U
K5
GAS V
ALVE
HIGH LIM
IT
AUX LIM
IT
PRE
SSUR
E
SWI
T
C
H
FLAM
E
SE
NSO
R
PRO
BE
IGN
ITO
R
FP
IGN
GN
D
MV
MLV
PS
HLO
HL
I
CI
R
C
U
L
AT
O
R
BL
OW
ER
XFM
R
HOT
XFM
R
NE
U
24
V
A
C
TH
RO1
RO2
R
TR
C
Y
G
W
COM
PRESS
OR
CON
TA
CTOR
COIL
THE
RMOSTA
T
R
Y
G
W
I
ND
U
C
E
R
IN
D
E
LEC
TRO
NIC
A
IR CL
E
A
N
E
R
EAC
EA
C
NEU
K6
ROLL
OUT
SWIT
CH
K1
FAC
TORY
JUM
PER
FAC
TORY
JUM
PER
PSO
K2
K3
K3
LO
HEA
T
COM
PM
HI
2
-ST
AGE
K7
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.