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6 7
WIRING TERMINAL
Wire specifications
18-24 gauge thermostat wire
Installation notes
• Ensure power at the HVAC
equipment is off.
• Loosen screw terminals,
insert stripped wire and
re-tighten.
• Push the excess wire
back into the opening and
plug the wall opening to
prevent drafts.
INSTALLATION
RC – 24 VAC supply cooling*
R – 24 VAC supply heating*
W – First stage heat (conventional) / First stage auxiliary (heat pump)
Y – First stage cooling (conventional) / First stage compressor (heat pump)
G – Fan
C – Common
S1 & S2 – Outdoor temperature sensor (optional)
O/B – Reversing valve
L – System fault indicator
W2 – Second stage heat (conventional) / Second stage auxiliary (heat pump)
Y2 – Second stage cooling (conventional) / Second stage compressor (heat pump)
* Jumper between RC & R is used in single transformer systems (see wiring diagrams).
C
G
Y
W
R
L
S1
S2
O/B
W2
Y2
RC
WIRING – SINGLE TRANSFORMER (USE
JUMPER WIRE) FOR HEAT/COOL SYSTEM
INSTALLATION
1st HEATING
1st COOLING
FAN
2nd HEATING
2nd COOLING
OUTDOOR TEMP
SENSOR
NOT USED
NOT USED
JUMPER
TRANSFORMER
C
G
Y
W
R
L
S1
S2
O/B
W2
Y2
RC
WIRING – TWO TRANSFORMERS (REMOVE
JUMPER WIRE) FOR HEAT/COOL SYSTEM
1st HEATING
1st COOLING
FAN
2nd HEATING
2nd COOLING
OUTDOOR TEMP
SENSOR
NOT USED
NOT USED
HEATING
TRANSFORMER
COOLING
TRANSFORMER
C
G
Y
W
R
L
S1
S2
O/B
W2
Y2
RC
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