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Installation Guide
Wiring
Wiring guide — conventional systems
Shaded areas below apply only to TH5220D.
1H/1C System
(1 transformer)
Rc
Power
[1]
R
[R+Rc joined by jumper]
Y
Compressor contactor
C
24VAC common
W
Heat relay
G
Fan relay
Heat-only System
Rc
Power
[1]
R
[R+Rc joined by jumper]
C
24VAC common
W
Heat relay
Heat-only System
(Series 20)
[5]
Rc
[R+Rc joined by jumper]
R
Series 20 valve terminal "R"
Series 20 valve terminal "W"
Y
C
24VAC common
W
Series 20 valve terminal "B"
Heat-only System
(normally open zone valve)
Rc
[R+Rc joined by jumper]
R
Power
[1]
Y
Normally open zone valve
C
24VAC common
1H/1C System
(2 transformers)
Rc
Power (cooling transformer)
R
Power (heating transformer)
Y
Compressor contactor
C
24VAC common
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 transformer.
[5]
In Installer Setup, set system type to
Heat Only.
G
W
C
Y
R
W
C
R
[3]
G
W
C
Y
R
W
C
Y
R
G
W
C
Y
R
W
C
R
C
Y R
[3]
W
C
R
G
W
C
Y
R
W
C
Y
R
G
W
C
Y
R
W
C
Y
R
W
C
R
G
W
C
Y
R
C
Y R
[1]
C
Y R
[3]
W
C
Y
R
W
C
R
G
W
C
Y
R
G
W
C
Y
R
[5]
C
Y R
W
C
Y
R
G
W
C
Y
R
C
Y R
[3]
G
W
C
Y
R
[1, 2]
[1, 2]
[3, 4]
Heat-only System
with Fan
Rc
G
W
C
G
Y
Rc
Power
R
[R+Rc joined by jumper]
C
24VAC common
Rc
W
C
G
W
Heat relay
G
W
C
Y
G
Fan relay
Rc
G
Cool-only System
Y2
W2
G
Rc
W
C
Y
Rc
Power
W
C
G
Rc
G
W
C
Y
R
[R+Rc joined by jumper]
Rc
G
Y
Compressor contactor
Y2
W2
G
Rc
C
Y R
C
24VAC common
W
C
Y
Rc
W
C
G
G
Fan relay
G
Rc
Y2
W2
G
Rc
2H/2C System
Rc
G
W
C
Y
(1 transformer)
C
Y R
Y2
W2
G
Rc
W
C
Y
G
W
C
Y
Rc
Rc
Power
G
Rc
G
Y2
W2
G
Rc
R
[R+Rc joined by jumper]
Y
Compressor contactor (stage 1)
G
W
C
Y
Rc
Y2
W2
G
C
Y R
C
24VAC common
W
C
Y2
W2
G
Rc
Rc
Rc
G
W
Heat relay (stage 1)
G
Fan relay
W2
Heat relay (stage 2)
Rc
G
W
C
Y
W
C
Y
Y2
W2
G
Rc
Y2
Compressor contactor (stage 2)
Y2
W2
G
Rc
2H/2C System
(2 transformers)
C
Y R
Rc
Rc
Y2
W2
G
Rc
Power (cooling transformer)
R
Power (heating transformer)
Y
Compressor contactor (stage 1)
G
W
C
Y
C
24VAC common
Rc
W
Heat relay (stage 1)
G
Fan relay
W2
Heat relay (stage 2)
Y2
Compressor contactor (stage 2)
See
[notes]
below
[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]
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.
[10]
Install field jumper between Aux and E if
there is no emergency heat relay.
W
R
C
Rc
R
Rc
[1]
[3]
R
Rc
C
Y
R
Rc
R
Rc
W
C
R
Rc
W
C
Y
R
Rc
Y2
W2
R
Rc
[1]
R
Rc
W
C
R
Rc
R
Rc
C
Y
R
Rc
W
C
Y
R
Rc
Y2
W2
Rc
[3]
R
Rc
Y2
W2
R
C
Rc
Y
R
Rc
W
C
R
Rc
W
C
Y
R
Rc
R
Rc
[6]
Rc
Y2
W2
W
C
Y
R
Rc
R
Rc
Y2
W2
R
Rc
[1]
C
Y
R
Rc
W
C
R
Rc
W
C
Y
R
Rc
R
Rc
W
C
Y
R
Rc
Rc
Y2
W2
[3]
R
Rc
W
C
Y
R
Rc
C
Y
R
Rc
R
Rc
Y2
W2
R
Rc
W
C
Y
R
Rc
W
C
Y
R
Rc
[6]
Rc
Y2
W2
W
C
Y
R
Rc
R
Rc
[3, 4]
G
W
C
R
Rc
G
C
Y
R
Rc
G
W
C
R
Rc
G
W
C
Y
R
Rc
G
C
Y
R
Rc
G
W
C
R
Rc
G
W
C
Y
R
Rc
G
W
C
Y
R
Rc
G
C
Y
R
Rc
G
W
C
Y
R
Rc
G
W
C
Y
R
Rc
G
W
C
R
Rc
G
W
C
Y
R
Rc
G
C
Y
R
Rc
G
W
C
Y
R
Rc
G
W
C
Y
R
Rc
[1, 2]
[1, 2]
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