20
IGNITOR
INDUCER
GAS
VALVE
SUPPLY AIR
LIMIT SWITCH
(ALL MODELS)
VENT
SAFETY SWITCH
(SELECT
MODELS ONLY)
TRANSFORMER
FLAME SENSOR
C
GREEN
BLACK
WHITE
BLUE
BLUE
24 V
120 V
ORANGE
BLUE
BLUE
YELLOW
BROWN
RED
BLACK
WHITE
ORANGE
BLUE
BLACK
ORANGE
BLACK
RED
AIR CONDITIONER
CONDENSING UNIT
BLACK
BLACK
BLOWER DOOR
SWITCH
R
WHITE
BLACK
WHITE W/ BLK STRIPES
BLK W/ WHITE STRIPES
WHITE (NEUTRAL)
BLACK 120V
GROUND
ROOM THERMOSTAT
3 OR 4 SPEED MOTOR
H
MH
ML
L
C
WHITE
RED
ORANGE
BLUE
BLACK
MOTOR
PLUG
1
2
3
4
5
6
BLACK
BLUE
FLAME ROLL-OUT
SWITCH
(ALL MODELS)
VENT
PRESSURE SWITCH
(93+ MODELS ONLY)
PRESSURE
SWITCH
R
Y
G
W
C
Y
180
120
90
60
These wires are
not present
on all models
BLOWER
DECK SWITCH
(SELECT
MODELS ONLY)
Legend
Field Wiring
Factory Wiring:
Low Voltage
High Voltage
Power On
Limit Circuit Open or External Load On "W"
Pressure Switch is Open with Inducer On
Pressure Switch is Closed with Inducer Off
Ignition Failure (Check Ground)
115 VAC & Neutral Reversed or no Ground
False Flame or Gas Valve Relay Shorted
ON
1 FLASH
2 FLASHES
3 FLASHES
4 FLASHES
5 FLASHES
Continuous
STATUS
RED
LIGHT
FAULT CONDITION
Power Off
Low Flame Sensor Signal
Flame Present
Continuous
Flash
OFF
ON
FLAME
YELLOW
LIGHT
FAULT CONDITION
BLUE
FLAME
ROLL-OUT SWITCH
(SELECT
MODELS ONLY)
Refer to the Installation
Instructions provided
with the furnace for the
proper heating and
cooling speeds for your
application.
VENT SAFETY SWITCH
(SELECT MODELS ONLY)
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.
WD#710355
Figure 13. Wiring Diagram
