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Wiring conventional systems: forced air and hydronics
1H/1C System (1 transformer)
R
Power [1]
Rc
[R+Rc joined by Slider Tab] [2]
Y
Compressor contactor
C
24 VAC common [3]
W
Heat relay
G
Fan relay
Heat-only System
R
Power [1]
Rc
[R+Rc joined by Slider Tab] [2]
C
24 VAC common [3]
W
Heat relay
Heat-only System (Series 20) [5]
R Series 20 valve terminal "R" [1] Rc
[R+Rc joined by Slider Tab] [2] Y
Series 20 valve terminal "W"
C
24 VAC common [3]
W
Series 20 valve terminal "B"
Heat-only System
(power open zone valve) [5]
R
Power [1]
Rc
[R+Rc joined by Slider Tab] [2]
W
Valve
C
24 VAC common [3]
NOTES:
• Available wiring configurations may differ by product models/product numbers.
• 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] Move R-Slider Tab on UWP to the R setting. For
more information, see "Setting Slider Tabs" on
page 5.
[3] Optional 24 VAC common connection.
[4] If you do not have separate wires for the Aux
and E terminals, connect the wire to the Aux
terminal.
1H/1C System (2 transformers)
R
Power (heating transformer) [1] Rc
Power (cooling transformer) [1] Y
Compressor contactor
C
24 VAC common [3, 4]
W
Heat relay
G
Fan relay
Heat-only System with Fan
R
Power [1]
Rc
[R+Rc joined by Slider Tab] [2]
C
24 VAC common [3]
W
Heat relay
G
Fan relay
Cool-only System
R
Power [1]
Rc
[R+Rc joined by Slider Tab] [2]
Y
Compressor contactor
C
24 VAC common [3]
G
Fan relay
2H/2C System (1 transformer) [6]
R
Power [1]
Rc
[R+Rc joined by Slider Tab] [2]
Y
Compressor contactor (stage 1)
C
24 VAC common [3] W
Heat relay (stage 1) G Fan
relay
W2 Heat relay (stage 2)
Y2
Compressor contactor (stage 2)
[5] In Installer Setup Options (ISU), set system type
to Boiler. Set number of cool stages to 0.
[6] In Installer Setup Options (ISU), set system type
to Conventional. Set cool stages to 2, and set
heat stages to 2.
6
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