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Idiomas disponibles
Idiomas disponibles
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
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
Series 20 Zone Valve [5]
Series 20 valve terminal "R" [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
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]
Valve
W
24VAC common [3]
C
Wiring heat pump systems
1H/1C Heat Pump System
R
Power [1]
Rc
[R+Rc joined by Slider Tab] [2]
Compressor contactor
Y
24VAC common [3]
C
O/B Changeover valve [6]
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 over-
load protection as required.
Move R-Slider Tab on the base plate to the R set-
[2]
ting. For more information, see "Setting slider tabs"
on page 3
Optional 24VAC common connection.
[3]
Common connection must come from cooling trans-
[4]
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
Fan
G
Heat-only System with Fan
R
Power [1]
[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
Y
Compressor contactor
C
24VAC common [3]
G
Fan
2H/1C Heat Pump System (PSTSP21AWH
only)
R
Power [1]
Rc
[R+Rc joined by Slider Tab] [2]
Y
Compressor contactor
C
24VAC common [3]
O/B Changeover valve [6]
G
Fan
AUX Auxiliary heat
E
Emergency heat
W
Do not use this terminal for heat
pump applications!
former.
In ISU set Heat system type to Radiant Heat. Set
[5]
number of cool stages to 0.
In Installer Setup, set changeover valve to O (for
[6]
cool changeover) or B (for heat changeover).
4
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