4
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
C – Common (optional when powered by batteries)
B – Reversing valve
1
O – Reversing valve
1
Y – 1st stage cooling / compressor
Y2 – 2nd stage cooling / compressor
G – Fan
RC – 24VAC supply cooling
2
R – 24VAC supply heating
2
W2 – 2nd stage heat / auxiliary
W – 1st stage heat / auxiliary
L – System fault indicator (optional) (heat pump only)
S1 & S2 – outdoor temperature sensor (optional)
T1 & T2 – remote temperature sensor (optional)
1
O and B terminals are both de-energized when system mode is
OFF or in AUTO when the heating and cooling equipment is idle.
2
Jumper between RC & R is used in single transformer systems
(see wiring diagrams).
