Honeywell T6 Pro Serie Notice D'installation page 4

Wiring conventional systems: forced air and hydronics
Shaded areas below apply only to TH6320U/TH6220U or as otherwise noted.
1H/1C System (1 transformer)
Power [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
Compressor contactor
Y
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
Heat-only System (Series 20) [5]
Series 20 valve terminal "R" [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
Series 20 valve terminal "W"
Y
24VAC common [3]
C
Series 20 valve terminal "B"
W
Heat-only System
(power open zone valve) [5]
Power [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
Valve
W
24VAC common [3]
C
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.
1H/1C System (2 transformers)
Power (heating transformer) [1]
R
Power (cooling transformer) [1]
Rc
Compressor contactor
Y
24VAC common [3, 4]
C
Heat
W
Fan
G
Heat-only System with Fan
Power [1]
R
[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
Compressor contactor
Y
24VAC common [3]
C
Fan
G
2H/2C System (1 transformer) [6]
Power [1]
R
[R+Rc joined by Slider Tab] [2]
Rc
Compressor contactor (stage 1)
Y
24VAC common [3]
C
Heat (stage 1)
W
Fan
G
Heat (stage 2)
W2
Compressor contactor (stage 2)
Y2
[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.
4