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Wiring conventional systems: forced air and hydronics
1H/1C System (1 transformer)
Power [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
Compressor contactor
Y
24VAC common [3]
C
Heat
W
Fan
G
Heat-only System
Power [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
24VAC common [3]
C
Heat
W
Heat-only System (Series 20) [5]
Series 20 valve terminal "R" [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
Series 20 valve terminal "W"
Y
24VAC common [3]
C
Series 20 valve terminal "B"
W
Heat-only System
(power open zone valve) [5]
Power [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
Valve
W
24VAC common [3]
C
Wiring heat pump systems
1H/1C Heat Pump System
Power [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
Compressor contactor
Y
24VAC common [3]
C
O/B Changeover valve [7]
Fan
G
W
Do not use this terminal for heat pump
applications!
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]
Move R-Slider Tab on UWP to the R setting. For more
information, see "Setting Slider Tabs" on page 3
[3]
Optional 24VAC common connection.
[4]
Common connection must come from cooling transformer.
1H/1C System (2 transformers)
Power (heating transformer) [1]
R
Power (cooling transformer) [1]
Rc
Compressor contactor
Y
24VAC common [3, 4]
C
Heat
W
Fan
G
Heat-only System with Fan
Power [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
24VAC common [3]
C
Heat
W
Fan
G
Cool-only System
Power [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
Compressor contactor
Y
24VAC common [3]
C
Fan
G
2H/1C Heat Pump System (TH4210U only)
Power [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
Compressor contactor
Y
24VAC common [3]
C
O/B Changeover valve [7]
Fan
G
AUX Auxiliary heat
Emergency heat
E
W
Do not use this terminal for heat pump
applications!
[5]
In ISU set Heat system type to Radiant Heat. Set number of
cool stages to 0.
[7]
In Installer Setup, set changeover valve to O (for cool
changeover) or B (for heat changeover).
4
- Quick Links:
- Installer System Test
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