88-A952V001-1C-EN
59
Electrical Connections
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Field Wiring
O
BK
BK
Y2
Y1
Y1
B/C
B/C
W2
W1
W1
G
G
R
R
O
Y1
B/C
Two Stage
Thermostat
Furnace
Furnace IFC
Outdoor Unit
(No Transformer)
SEE
NOTE 2
BK JUMPER
SEE NOTE 1
Y2
W2
Y2
FIELD WIRING DIAGRAM FOR
TWO STAGE HEATING THERMOSTAT, TWO STAGE COOLING
NOTES:
1) For PWM (BK) enabled thermostats, cut the BK jumper
on the IFC and connect wiring.
2) The factory Y1-O jumper must remain in place for proper
LED read out in cooling mode.
3) Y1 and Y2 wiring from the thermostat must connect to
the IFC for proper airflow and LED readout.
4) Single compressor and two compressor airflow is auto-
matically set with the IFC Menu optionsin ODU section.
2-1=2 stage / 1 compressor (1st stage airflow = 80%)
2-2=2 stage / 2 compressors (1st stage airflow = 50%)
INTER-COMPONENT WIRING
24 V FIELD WIRING
24 V FACTORY WIRING
O
BK
BK
Y2
Y1
Y1
B/C
B/C
W2
W2
W1
W1
G
G
R
R
O
Y1
Two Stage
Thermostat
Furnace
Outdoor Unit
(No Transformer)
SEE
NOTE 2
O
R
X2
Y2
NOTES:
1) For PWM (BK) enabled thermostats, cut the BK jumper
on the IFC and connect wiring.
2) Remove the factory Y1-O jumper for HP systems
for proper LED read out.
3) Y1 and Y2 wiring from the thermostat must connect to Y1 and
Y2 of the IFC for proper airflow and LED readout.
4) Single compressor and two compressor airflow is automatically
set with the IFC Menu options in ODU section.
2-1=2 stage / 1 compressor (1st stage airflow = 80%)
2-2=2 stage / 2 compressors (1st stage airflow = 50%)
INTER-COMPONENT WIRING
24 V FIELD WIRING
24 V FACTORY WIRING
R-BK
JUMPER
SEE NOTE 1
Furnace IFC
FIELD WIRING DIAGRAM FOR
TWO STAGE HEATING THERMOSTAT, TWO STAGE HEAT PUMP
Y2
B/C
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