Honeywell T6 Pro Installation Instructions Manual page 5

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
W Do not use this terminal for heat pump
applications!
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
W Do not use this terminal for heat pump
applications!
2H/2C Heat Pump System
(TH6320U only) [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
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.
[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.
[7] In Installer Setup, set changeover valve to O (for
cool changeover) or B (for heat changeover).
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
W Do not use this terminal for heat pump
applications!
Dual Fuel System (TH6320U / TH6220U only)
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) [11]
L Heat pump fault input
S
Outdoor sensor
S Outdoor sensor
W Do not use this terminal for heat pump
applications!
[8] In ISU set Heat system type to Heat pump. 1 com-
pressor and 1 stage of backup heat.
[9] In ISU set Heat system type to Heat pump. 2 com-
pressors and 0 stage of backup heat.
[10] In ISU set Heat system type to Heat pump. 2 com-
pressors and 1 stage of backup heat.
[11] Dual fuel with Y2 only for TH6320U.
5