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With Variable Speed S-Series Furnace
Thermostat
R
24 VAC HOT
G
FAN
24 VAC
B/C
Common
O
SOV
Y1
COOL
1st STAGE
COOL
Y2
2nd STAGE
W1
HEATING
W2
BK
Section 12. Electrical - High Voltage
12.1 High Voltage Power Supply
WARNING
L
!
LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing, and
troubleshooting of this product, it may be nec-
essary to work with live electrical components.
Failure to follow all electrical safety precau-
tions when exposed to live electrical compo-
nents could result in death or serious injury.
The high voltage power supply must agree with
the equipment nameplate. Power wiring must
comply with national, state, and local codes.
Follow instructions on unit wiring diagram located
on the inside of the control box cover and in the
Service Facts document included with the unit.
12.2 High Voltage Disconnect Switch
Install a separate disconnect switch at the
outdoor unit.
For high voltage connections, flexible electri-
cal conduit is recommended whenever vibra-
tion transmission may create a noise problem
within the structure.
18-AC107D1-1A-EN
Outdoor
Furnace
Unit
R
G
B/C
B
O
(2)
Y1
Y1
Y2
Y2
W1
W2
(1)
BK
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 options in ODU section.
2-1=2 stage / 1 compressor (1st stage airflow = 75%)
2-2=2 stage / 2 compressors (1st stage airflow = 50%)
15
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