Wiring Heat Pump Systems - Honeywell T6 Pro Installation Instructions Manual

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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
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.
[6]
In Installer Setup, set system type to 2Heat/2Cool
Conventional.
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
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 - if needed)
L
Heat pump fault input
S
Outdoor sensor
S
Outdoor sensor
[7]
In Installer Setup, set changeover valve to O (for cool
changeover) or B (for heat changeover).
[8]
In ISU set Heat system type to Heat pump. 1 compressor
and 1 stage of backup heat.
[9]
In ISU set Heat system type to Heat pump. 2 compressors
and 0 stage of backup heat.
[10] In ISU set Heat system type to Heat pump. 2 compressors
and 1 stage of backup heat.
5

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