Wiring conventional systems
Shaded areas below apply only to
1H/1C System
(1 transformer)
Rc
Power
[1]
R
[R+Rc joined by jumper]
Y
Compressor contactor
C
24VAC common
[3]
W
Heat relay
G
Fan relay
Heat-only System
Rc
Power
[1]
R
[R+Rc joined by jumper]
C
24VAC common
[3]
W
Heat relay
Heat-only System
(Series 20)
[5]
Rc
[R+Rc joined by jumper]
R
Series 20 valve terminal "R"
Y
Series 20 valve terminal "W"
C
24VAC common
[3]
W
Series 20 valve terminal "B"
Heat-only System
(normally open zone
[5]
valve)
Rc
[R+Rc joined by jumper]
R
Power
[1]
Y
Normally open zone valve
C
24VAC common
[3]
1H/1C System
(2 transformers)
Rc
Power (cooling transformer)
R
Power (heating transformer)
Y
Compressor contactor
C
24VAC common
[3, 4]
W
Heat relay
G
Fan relay
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]
Remove jumper for 2-transformer systems.
[3]
Optional 24VAC common connection.
[4]
Common connection must come from cooling trans-
former.
[5]
In Installer Setup, set system type to
Heat Only.
TH6320U/TH6220D
G
W
C
Y
R
Rc
M29372
W
C
R
Rc
M29373
W
C
Y
R
Rc
M29374
[1]
C
Y R
Rc
M29375
G
W
C
Y
R
Rc
M29376
[1, 2]
[1, 2]
3
or as otherwise noted.
Heat-only System
with Fan
Rc
Power
[1]
R
[R+Rc joined by jumper]
C
24VAC common
W
Heat relay
G
Fan relay
Cool-only System
Rc
Power
[1]
R
[R+Rc joined by jumper]
Y
Compressor contactor
C
24VAC common
G
Fan relay
2H/2C System
(1 transformer)
[6]
Rc
Power
[1]
R
[R+Rc joined by jumper]
Y
Compressor contactor (stage 1)
C
24VAC common
W
Heat relay (stage 1)
G
Fan relay
W2
Heat relay (stage 2)
Y2
Compressor contactor (stage 2)
2H/2C System
(2 transformers)
[6]
Rc
Power (cooling transformer)
R
Power (heating transformer)
Y
Compressor contactor (stage 1)
C
24VAC common
W
Heat relay (stage 1)
G
Fan relay
W2
Heat relay (stage 2)
Y2
Compressor contactor (stage 2)
[6]
In Installer Setup, set system type to 2Heat/2Cool
Conventional.
[7]
In Installer Setup, set changeover valve to O or B.
[8]
In Installer Setup, set system type to 2Heat/1Cool
Heat Pump.
[9]
In Installer Setup, set system type to 2Heat/2Cool
Heat Pump.
[10]
In Installer Setup, set system type to 3Heat/2Cool
Heat Pump.
[11]
L terminal sends a continuous output when thermostat
is set to Em. Heat. Connect to Honeywell zoning panels
to switch the panel to Emergency Heat.
G
W
C
R
M29377
[3]
G
C
Y
R
M29378
[3]
Y2
W2
G
W
C
Y
R
M29379
[3]
Y2
W2
G
W
C
Y
R
M29380
[1, 2]
[1, 2]
[3, 4]
Rc
Rc
Rc
Rc