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WIRING DIAGRAM
For 80+ and 90+ 2-Stage Variable Speed Upflow Furnaces
Refer to the Installation Instructions
This wiring diagram shows connections and
provided with the kit for the proper
termination required for the blower kit only.
heating and cooling speeds for your
Use in addition to the wiring diagram for the
application.
furnace.
CONDENSATE
(ON SELECT
MODELS)
LOW
ORANGE
PRESSURE
PRESSURE
SWITCH
SWITCH
ORANGE
HIGH
VIOLET
PRESSURE
PRESSURE
SWITCH
SWITCH
VIOLET
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
BLACK
BLK W/ WHITE STRIPES
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
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
Low Flame Sensor Signal
Flame Present
L2-IN
L2-OUT
GREEN
RED
W Y/Y2 Y1
BROWN
BROWN
1
1 1
RED
RED
2 2
2
ORANGE
ORANGE
3 3
3
YELLOW
YELLOW
4 4
4
GREEN
GREEN
5 5
5
BLUE
BLUE
6 6
6
BLUE
BLUE
7 7
BLACK
BLACK
8 8
WHITE
WHITE
9 9
FAULT CONDITIONS
Diagnostic Description
Green LED
Red LED
Off
Flash
Alternating Flash
On
On
Flash
Flash
On
Diagnostic Description
Yellow LED
Continuous Flash
On
BLACK
MOTOR
WHITE
DHUM Y1 SEN GND
PW M
MODE
SPEED
FAULT
COMMON
HP
OPEN
OPEN
BLACK
R
DX+
MOTOR CHOKE
DX-
(ON 3/4 AND 1HP
C
MOTORS ONLY)
R
C
BLACK
RX
GND
TX
W
H
R
C
BLUE
1
2
BLOWER
BLOWER
3
LIMIT
LIMIT
4
BLUE
5
6
710918B
(Replaces 710918A)
04/11
Off
Flash
On
Flash
On
Off
Off
CFM
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