ADDENDUM For Variable Speed Furnaces used with Two Stage Cooling
Two-Stage Furnaces with Variable Speed Blower,
Single-Stage Furnaces with Variable Speed Blower
The furnace is supplied with the yellow “Y1” and blue “Y2” connections attached to the "Y" terminal on
the furnace control board. For single stage cooling operation, leave the yellow and blue wires in place.
The indoor blower will operate at the CFM called out in the "High" column.
For Single Stage Heat and Two Stage
Cooling
When installing this furnace with a two stage
condensing unit, remove the blue “Y2” wire from
the control board and connect to the thermostat.
Connect a field supplied wire from the yellow
“Y1” to the thermostat and the condensing unit,
and another wire connected from “Y2” on the
thermostat to “Y2” on the condenser. (See
Figure 1).
For Two Stage Heating and Two Stage
Cooling
When installing this two stage furnace with a two
stage condensing unit, both the yellow “Y1” and
the blue “Y2” connections remain on the furnace
control board. Connect a field supplied wire from
the yellow “Y1” to the thermostat and the
condensing unit, and another wire from “Y2” on
the thermostat to “Y2” on the condenser. (See
Figure 1).
Follow all start up procedures outlined in the instruction manual.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Y2
Y1
THERMOSTAT
TWO STAGE CONDENSING UNIT
Y2
Y1
YELLOW
Y1
BLUE
Y2
CONDENSING
UNIT
REMOVE BLUE
WIRE FROM
Y TERMINAL
OF
FURNACE
BOARD
Figure 1
720 900 1056 1200 1350 1500 1656 1800
7
1
0
1
0
1
0
1
0
6
0
0
0
0
1
1
1
1
5
0
0
1
1
0
0
1
1
72,000 59
51
44
90,000 63
55
49 44
96,000 67 59
53
47
108,000 67
59
53 48
120,000 66
59
54 49
126,000 69 62
56
51
144,000 71
64
59
80,000 67
59
52 47
100,000 73 65
59
53 49
120,000 71
64
59
Temperature Rise °F (Recommended settings are
Bold
)
Nominal Air-Flow
80+% 92+%
Switches
Table 2. Heating Airflow Settings
NOTE: 0 = OFF 1 = ON
Nominal A/C and HP
LOW HIGH 1 2 3 4
567
Capacity
500 720 0 0 0 1
550 800 0 0 0 0
610 880 0 0 1 0
650 945 1 0 0 1
720 1050 1 0 0 0
800 1155 1 0 1 0
900 1305 0 1 0 1
1000 1450 0 1 0 0
1060 1530 1 1 0 1
1100 1595 0 1 1 0
1170 1700 1 1 0 0
1290 1870 1 1 1 0
CFM SWITCH NUMBER
2 TON
3.5 TON
4 TON
5 TON
3 TON
2.5 TON
Table 1. Cooling/Heat Pump Airflow Settings
NOTE: 0 = OFF 1 = ON
7082770
O'Fallon, MO
Specifications and illustrations subject to change
without notice and without incurring obligations.
Printed in U.S.A. (05/03)
¢708277I¤
7082770
Figure 3. Wiring Diagram for Two-Stage Furnaces with Variable Speed Blower
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
IGNITOR
INDUCER
PRIMARY
GAS
VALVE
SUPPLY AIR
LIMIT SWITCH
(ALL MODELS)
VENT
SAFETY SWITCH
(ALL MODELS)
TRANSFORMER
FLAME SENSOR
C
GREEN
BLACK
WHITE
BLUE
24 V
120 V
ORANGE
BLUE
BLUE
YELLOW
BROWN
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
BLACK
BLUE
FLAME ROLL-OUT
SWITCH
(ALL MODELS)
VENT
PRESSURE SWITCH
PRESSURE
SWITCH
C
Y
180
120
90
60
TWO STAGE
ROOM THERMOSTAT
R
Y
G
W
W2
SECONDARY
SOLENOID
GAS VALVE
YELLOW
GREEN
YELLOW
GREY
RED
BROWN
YELLOW
BROWN
BLACK
WHITE
BLACK
SEE INSTALLATION
INSTRUCTIONS
FOR ALTERNATE
MEANS OF USING
SECOND STAGE.
BLOWER DECK
LIMIT SWITCH
(SELECT MODELS ONLY)
BLUE
W
W
RED
R
R
13 11 7 5
1234567
GREY
YELLOW
BLUE
BROWN
ORANGE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
POWER FACTOR
CORRECTION CHOKE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
12345
VARIABLE
SPEED
BLOWER
MOTOR
12345
VARIABLE SPEED
BLOWER CONTROL BOX
NOTES:
1. Use copper conductors only.
2. 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.
3. Refer to the Installation Instructions provided with the furnace
for the appropriate heating and cooling speed settings for
your application.
4. Ensure that wires from the blower remain connected to the board
thermostat terminals after making the field thermostat connections.
5. Wiring shown for 2-stage operation when using a multistage thermostat.
Warning - Remove Yellow/Black wire from primary gas valve and utilize
for wiring furnace for 2-stage operation.
WHITE
YELLOW/
BLACK
CLOSED END
CONNECTOR
DO NOT REMOVE!
SEE
NOTE 5
BROWN
(90+ MODELS ONLY)
BROWN
R
BROWN
YELLOW
BLUE
YELLOW
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Y2
Y1
THERMOSTAT
INSERT A:TWO STAGE CONDENSING UNIT
Y2
Y1
YELLOW
Y1
BLUE
Y2
CONDENSING
UNIT
REMOVE BLUE
WIRE FROM
Y TERMINAL
OF
FURNACE
BOARD
IF TWO STAGE CONDENSING UNIT
IS USED, SEE INSERT A
For 80+ and 90+ 2-Stage Variable Speed
Model Furnaces
7103600 (Replaces 7103300)
7103600
WIRING DIAGRAM
Figure 2. Wiring Diagram for Single-Stage Furnaces with Variable Speed Blower
WIRING DIAGRAM
For Upflow and Downflow Residential 80+ Furnace
with Variable Speed Blower
7103590 (Replaces 710192A)
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
IGNITOR
INDUCER
PRIMARY
GAS
VALVE
SUPPLY AIR
LIMIT SWITCH
(ALL MODELS)
VENT
SAFETY SWITCH
(ALL MODELS)
TRANSFORMER
FLAME SENSOR
C
GREEN
BLACK
WHITE
BLUE
24 V
120 V
ORANGE
BLUE
BLUE
YELLOW
BROWN
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
BLACK
BLUE
FLAME ROLL-OUT
SWITCH
(ALL MODELS)
PRESSURE
SWITCH
C
180
120
90
60
THERMOSTAT
R
Y
G
W
YELLOW
GREEN
BLUE
GREY
RED
YELLOW
BLACK
WHITE
BLACK
W
W
RED
R
R
13 11 7 5
1234567
GREY
YELLOW
BLUE
BROWN
ORANGE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
POWER FACTOR
CORRECTION CHOKE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
12345
VARIABLE
SPEED
BLOWER
MOTOR
12345
VARIABLE SPEED
WER CONTROL BOX
NOTES:
1. Use copper conductors only.
2. 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.
3. Refer to the Installation Instructions provided with the furnace for the
appropriate heating and cooling speed settings for your application.
4. Ensure that wires from the blower remain connected to the board
thermostat terminals after making the field thermostat connections.
WHITE
YELLOW
YELLOW
Y
IF TWO STAGE CONDENSING UNIT
IS USED, SEE INSERT A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Y2
Y1
THERMOSTAT
INSERT A: TWO STAGE CONDENSING UNIT
Y2
Y1
YELLOW
Y1
BLUE
Y2
CONDENSING
UNIT
REMOVE BLUE
WIRE FROM
Y TERMINAL
OF
FURNACE
BOARD
-
1
-
2
Westinghouse FG6T(A,K) Installation guide
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