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Wiring
Wiring guide — heat pump systems
Wiring Instructions
1. This thermostat requires a 24Vac common to power the thermostat. If the model you have offers a K
terminal, it may be used for the Wiresaver module (THP9045A1023). The K terminal is not available on all
models.
2. Straighten the wire. Using a pen tip to hold down the terminal, gently slide the wire into 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
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
G
Fan relay
Aux/E Auxiliary/Emergency heat relay
L
Heat pump system monitor
NOTES
Wire specifications:
Use 18- to 22-gauge thermostat wire. Shielded cable is not required.
[1]
Power supply. Provide disconnect means and overload protection as required.
[2]
In Setup, set changeover valve to O or B.
C
K
Rc
R
Y
G
W2
Y2
O/B
[7]
C
K
Rc
R
Y
G
Y2
Aux/E
O/B
[2]
C
K
Rc
R
W
Y
3H/2C Heat
Pump System
Rc
Power
L
MCR34828
R
[R+Rc joined by jumper loop]
Y
Compressor contactor (stage 1)
C
24VAC common
O/B
Changeover valve
G
Fan relay
Aux/E Auxiliary/Emergency heat relay
Y2
Compressor contactor (stage 2)
L
Heat pump system monitor
L
MCR34829
See
[notes]
Jumper Loop
G
W2
Y2
L
MCR34821
5
C
K
Rc
R
Y
O/B
[1]
[2]
below
G
Y2
L
Aux/E
MCR34830
33-00019EFS—03
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