5 33-00235
Wiring
Wiring Guide — Heat Pump Systems
NOTES
Wire specifications: Use 18 to 22-gauge thermostat wire. Shielded cable is not required.
[1] For power supply, provide a means of disconnection and overload protection.
[2] In Setup, set changeover valve to O or B.
Wiring Instructions
1. This thermostat requires a 24VAC common wire to power-up. The K terminal is available for
Wiresaver module (THP9045A1023).
2. Straighten the wire. Using a pen’s tip, hold down the terminal and gently slide the wire into
the terminal hole.
Note: Terminal hole will only accept one wire.
1H/1C Heat
Pump System
Rc Power [1]
R [R+Rc joined by jumper loop]
Y Compressor contactor
C 24VAC common
O/B Changeover valve [7]
G Fan relay
2H/1C Heat
Pump System
Rc Power [1]
R [R+Rc joined by jumper loop]
Y Compressor contactor
C 24VAC common
O/B Changeover valve [2]
G Fan relay
Aux/E Auxiliary/Emergency heat relay
L Heat pump system monitor
Jumper Loop
3H/2C Heat
Pump System
Rc Power [1]
R [R+Rc joined by jumper loop]
Y Compressor contactor (stage 1)
C 24VAC common
O/B Changeover valve [2]
G Fan relay
Aux/E Auxiliary/Emergency heat relay
Y2 Compressor contactor (stage 2)
L Heat pump system monitor
See [notes] below
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