4
Wiring conventional systems: forced air and hydronics
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 (built-in jumper)” on
page 3
[3]
Optional 24VAC common connection.
[4]
Common connection must come from cooling transformer.
[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).
1H/1C System
(1 transformer)
R
Power
[1]
Rc
[R+Rc joined by Slider Tab]
[2]
Y
Compressor contactor
C
24VAC common
[3]
W
Heat relay
G
Fan relay
Heat-only System
R
Power
[1]
Rc
[R+Rc joined by Slider Tab]
[2]
C
24VAC 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
24VAC 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
24VAC common
[3]
1H/1C System
(2 transformers)
R
Power (heating transformer)
[1]
Rc
Power (cooling transformer)
[1]
Y
Compressor contactor
C
24VAC 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
24VAC 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
24VAC common
[3]
G
Fan relay
1H/1C Heat Pump System
R
Power
[1]
Rc
[R+Rc joined by Slider Tab]
[2]
Y
Compressor contactor
C
24VAC common
[3]
O/B
Changeover valve
[7]
G
Fan relay
Wiring heat pump systems
Wiring conventional systems: forced air and hydronics
Shaded areas below apply only to
TH1110D
.
