31
For 95+ 2-Stage
Model Furnaces (2-Stage Inducer)
Figure 25. Wiring Diagram
WD# 7106800
C
R
FLAME SENSOR
PRESSURE
LO
W
HI
HI
LO
W
SWITCH
PRESSURE
SWITCH
BLO
W
ER DOOR
SWITCH
TRANSFORMER
24 V
120 V
WHITE W/BLK
STRIPES
BLK W/ WHITE
STRIPES
IGNIT
O
2-PIN
HOUSING
6-PIN PLUG
3-PIN PLUG
3-PIN HOUSING
(SUPPLIED W/ INDUCER)
R
INDUCER
PRIMAR
Y
GAS
VA
LV
E
COM
24 V
3 AMP FUSE
BLO
W
ER OFF
TWIN
FLAME
STATUS
1
1
2
2
1
2
1
2
3
3
VENT SAFETY SWITCH
HI
LO
W
C
SUPPL
Y
AIR
LIMIT SWITCH
FLAME R
O
LL-OUT
SWITCH
ADD ON BO
ARD
Y2
Y2
W2
CONDENSA
TE
BLOCKED VENT
EA
C
HUM
HUM
M1
M2
M3
HEAT
COOL
EAC
XFMR
L1
NEUTRALS
R
C
Y
G
W
MO
T
O
R
NOISE
FILTER
1
2
3
45
1
2
345
R
C
W2
W
HY
R
P
O.D
. UNIT
I.D. BLO
WER
THERMOST AT
TWIN
CR
DX+
DX-
GND
DX-
DX+
GRD
COIL
THERMIST
O
R
TEMP
SENSOR
COIL
THR
4-PIN
HARNESS
U CORE
RING
THRU CORE
RING
PO
WER
BUSHING
CABLE
CONTR
OL
CABLE
INTERF
A
C
E
BO
ARD
BLA
C
K
BLA
CK
BLA
CK
BLA
CK
BLAC
K
RED
YELLO
W
WHITE
WHITE
GREEN
GREEN
RED
PLUG
3-PIN HARNESS
3-PIN HARNESS
CONNECT
O
R
C
W2
RH
R
W1
H
0
Y2
Y1
G
L
V
A
B
GD
OD
ID
GD
THERMOST
A
T
CONTR
O
L
TO
OUTDOOR
UNIT
TO
OUTDOOR
UNIT
9-PIN PLUG
1
2
3
4
5
6
7
8
9
3
4
5
1
2
3
6
2
1
3
2
3
1
45
6
RED
WHITE
GREEN
HARNESS
EXV
BOARD
ON
R
Y
SW2
P2
THERM
P3
THERM
SW1
COMM
P4
EXV P1
C
OFF
SUCTION TEMP.
SENSOR
SUCTION PRESS.
SENSOR
GREEN
BLACK
WHITE
RED
RED
EXV
6-WIRE CABLE
CABLE
WHITE
GREEN
GREEN
BLACK
3-PIN PLUG
6-PIN PLUG
WHITE
BLACK
FURNA
C
E
BO
ARD
GREEN
RED
RED
YELLOW
GRAY
RED
YELLOW
RED
BLUE
BLUE
WHITE
BLACK
BLACK
BLUE
BLU
E
BLUE
ORANGE
WHITE
GREEN
BLACK
BLACK
BLACK
RED
BRO
WN
GREEN
ORA
NGE
YEL
LOW
YEL
LOW
BRO
WN
BROWN
YELLOW
WHITE
BLACK
BLA
CK
BLACK
VIOLET
BLA
CK
RED
BLA
CK
WHITE
VIOLET
VIOLET
FIELD WIRING
LEGEND:
LO
W V
O
LT
A
G
E
HIGH V
O
LT
A
G
E
STATUS
RED LIGHT
Power On
ON
Limit Circuit Open or External Load On "W
"
1
FLAS
H
Pressure Switch is Open with Inducer On
2 FLASHE
S
Hi Pressure Switch is Open (Add-on board LED)
2 FLASHE
S
Pressure Switch is Closed with Inducer Of
f
3
FLASHE
S
Ignition Failure (Check Ground)
4
FLASHE
S
115 VAC & Neutral Reversed or no Groun
d
5
FLASHE
S
False Flame or Gas Valve Relay Shorted
C
ontinuous
Power Of
OFF
FAULT CONDITIO
N
FLAME
YELLOW
LIGH
T
Low Flame Sensor Signa
l
Continuous
Flash
Flame Presen
ON
NO
TES:
1.
Use copper conductor
s onl
y
.
2.
If an
y of the original wires as supplied with the furnace m
u
st be replaced,
it m
ust be replaced with wiring material ha
ving a temperature rating of at
least 105˚ C.
3.
Refer to the Installation Instructions pr
o
v
ided with the furnace f
o
r the
appr
opriate heating and cooling settings f
or y
our application.
4.
Ensure that wires fr
om the b
lo
w
er remain connected to the boar
d
thermo-
stat terminals after making the field thermostat connections.
