Y2 Compressor contactor (stage 2)
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.
5. In ISU set Heat system type to Radiant Heat. Set number of cool stages to 0.
6. In Installer Setup, set system type to 2Heat/2Cool Conventional
Wiring heat pump systems
Shaded areas below apply only to TH6320U/TH6220U or as otherwise noted.
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
2H/1C Heat Pump System [8]
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
Aux Auxiliary heat
E Emergency heat relay
L Heat pump fault input
2H/2C Heat Pump System [9]
R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
Y Compressor contactor (stage 1)
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
Y2 Compressor contactor (stage 2)
L Heat pump fault input
3H/2C Heat Pump System
(TH6320U only) [10]
R Power [1]
Rc [R+Rc joined by Slider Tab] [2]
Y Compressor contactor (stage 1)
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
Aux Auxiliary heat
E Emergency heat relay
Y2 Compressor contactor (stage 2)
L Heat pump fault input
Dual Fuel System
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