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WIRING DIAGRAM
For 80+ and 90+ 2-Stage Fixed Speed Downflow Furnaces
This wiring diagram shows connections and
Refer to the Installation Instructions
termination required for the blower kit only.
provided with the kit for the proper
Use in addition to the wiring diagram for the
heating and cooling speeds for your
furnace.
application.
HIGH
LOW
PRESSURE
PRESSURE
SWITCH
SWITCH
GREEN
GAS
VALVE
3 3
C
BROWN
2 2
HI
BROWN
YELLOW
LO
1 1
RED
FLAME SENSOR
BLUE
BLUE
BLUE
SUPPLY
FLAME
VENT LIMIT
AIR LIMIT
ROLL-OUT
(ON SELECT
MODELS)
WHITE
BLACK
WHITE
DOOR
(NEUTRAL)
SWITCH
BLACK 120V
GROUND
GREEN
LEGEND:
FIELD WIRING
LOW VOLTAGE
HIGH VOLTAGE
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.
WHITE
WHITE W/ BLK STRIPES
120 V
24 V
BLK W/ WHITE STRIPES
BLACK
1 2 3 4
1 2 3 4
BLACK
WHITE
Y/Y2 Y1 G
W2 W1 C R
10 11 12
7
8
9
4
5
6
1
2
3
BLWR OFF
DELAY
1 2 3 4 5
BLACK
INDUCER
C
1 1
H
2 2
IGNITOR
L
1 2 3
1 2 3
Diagnostic Description
Control Fault (No Power)
L1 / Neutral Polarity Fault
1 Hour Lockout
Normal Operation
Pressure Switch Closed Fault
Pressure Switch Open Fault
Open Limit Switch Fault
Motor Fault
Diagnostic Description
Low Flame Sensor Signal
Flame Present
W
W
R
TX
C
RX
GND GND
RX
C
TX
R
W
MOTOR CHOKE
(ON 3/4 AND 1HP
MODELS ONLY)
R
C
Y1 DEHUM TWIN
YELLOW
1 1
YELLOW
RED
2 2
RED
BLACK
3 3
BLACK
WHITE
4 4
WHITE
5 5
ORANGE
ORANGE
BLUE
6 6
BLUE
BLUE
7 7
BLACK
BLACK
8 8
WHITE
WHITE
9 9
FAULT CONDITIONS
Green LED
Red LED
Off
Off
Flash
Flash
Alternating Flash
On
On
On
Flash
Flash
On
Flash
Off
On
Off
Yellow LED
Continuous Flash
On
RED
RED
PART OF
MOTOR
RED
TORQUE
MOTOR
SPEED
HP
COMMON
NONE
PWM
MODE
NONE
BLOWER
BLOWER
BLOWER DECK
LIMIT
LIMIT
LIMIT
BLUE
710917B
(Replaces 710917A)
04/11
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