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
