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Wiring
Wiring guide — conventional 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 System
(1 transformer)
Rc
Power
[1]
R
[R+Rc joined by jumper loop]
Y
Compressor contactor
C
24VAC common
W
Heat relay
G
Fan relay
Heat-only System
Rc
Power
[1]
R
[R+Rc joined by jumper loop]
C
24VAC common
W
Heat relay
1H/1C System
(2 transformers)
Rc
Power (cooling transformer)
R
Power (heating transformer)
Y
Compressor contactor
C
24VAC common
W
Heat relay
G
Fan relay
Heat-only System
with Fan
Rc
Power
[1]
R
[R+Rc joined by jumper loop]
C
24VAC common
W
Heat relay
G
Fan relay
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]
Remove jumper loop for 2-transformer
systems.
[3]
Common connection must come from cooling transformer.
33-00019EFS—03
C
K
Rc
R
W
Y
G
W2
Y2
C
K
Rc
R
W
Y
G
W2
Y2
C
K
Rc
R
W
Y
G
W2
Y2
[1, 2]
[1, 2]
[3]
C
K
Rc
R
W
Y
G
W2
Y2
C
K
Rc
R
W
Y
Cool-only System
Rc
L
Power
MCR34821
R
[R+Rc joined by jumper loop]
Y
Compressor contactor
C
24VAC common
G
Fan relay
2H/2C System
(1 transformer)
Rc
Power
L
R
[R+Rc joined by jumper loop]
MCR34822
Y
Compressor contactor (stage 1)
C
24VAC common
W
Heat relay (stage 1)
G
Fan relay
W2
Heat relay (stage 2)
Y2
Compressor contactor (stage 2)
L
M34823
2H/2C System
(2 transformers)
Rc
Power (cooling transformer)
R
Power (heating transformer)
Y
Compressor contactor (stage 1)
C
24VAC common
W
Heat relay (stage 1)
G
Fan relay
W2
Heat relay (stage 2)
L
MCR34824
Y2
Compressor contactor (stage 2)
See
[notes]
Jumper Loop
G
W2
Y2
L
MCR34821
4
C
K
Rc
R
W
[1]
C
K
Rc
R
W
[1]
C
K
Rc
R
W
[1, 2]
[1, 2]
[3]
below
Y
G
W2
Y2
L
MCR34825
Y
G
W2
Y2
L
MCR34826
Y
G
W2
Y2
L
M34827
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