User Guide

8
Wiring Diagrams (continued)
2020WR Heating/Cooling
T
H
E
R
M
O
S
T
A
T
Sensor Common
S1
SC
S2
RH
RC
C
Y1
W1
O/B
G
W2
Y2
Optional
Remote or
Outdoor
Sensors
Heating Transformer
120 VAC
Cooling Transformer
120 VAC
Fan
Heat #2
24 VAC
Cool/Compressor #1
Cool/Compressor #2
Heat #1/Reversing Valve
3020WR Heating/Cooling
T
H
E
R
M
O
S
T
A
T
Sensor Common
S1
SC
S2
RH
RC
C
Y1
W1
O/B
G
W2
Y2
Optional
Remote or
Outdoor
Sensors
Heating Transformer
120 VAC
Cooling Transformer
120 VAC
Fan
Heat #2
24 VAC
AUX
Heat #3
Cool/Compressor #1
Cool/Compressor #2
Heat #1/Reversing Valve
* Remove factory-installed jumper for systems with two transformers.
 Note: Not all terminals may be used with every model.