Honeywell TH8321U Thermostat User Manual


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Installation Guide
4
69-2693—01
ENGLISH
Wiring guide—conventional systems
Wiring
1H/1C System (1 transformer)
Rc Power [1]
R [R+Rc joined by jumper]
W Heat relay
Y Compressor contactor
G Fanrelay
C 24VACcommon[3]
S1 Optionaloutdoor/remotesensor
S2 Optionaloutdoor/remotesensor
Heat Only System
Rc Power [1]
R [R+Rc joined by jumper]
W Heat relay
C 24VACcommon[3]
S1 Optionaloutdoor/remotesensor
S2 Optionaloutdoor/remotesensor
Heat Only System (Series 20)
Rc [R+Rc joined by jumper]
R Series20valveterminal“R”[1]
W Series20valveterminal“B”
Y Series20valveterminal“W”
C 24VACcommon[3]
S1 Optionaloutdoor/remotesensor
S2 Optionaloutdoor/remotesensor
2H/2C System (1 transformer)
Y2 Cool relay 2
W2 Heat relay 2
Rc Power [1]
R [R+Rc joined by jumper]
W Heat relay 1
Y Cool relay 1
G Fanrelay
C 24VACcommon[3]
S1 Optionaloutdoor/remotesensor
S2 Optionaloutdoor/remotesensor
1H/1C System (2 transformers)
Rc Power (cooling transformer) [1,2]
R Power (heating transformer) [1,2]
W Heat relay
Y Compressor contactor
G Fanrelay
C 24VACcommon[3,4]
S1 Optionaloutdoor/remotesensor
S2 Optionaloutdoor/remotesensor
Heat Only System With Fan
Rc Power [1]
R [R+Rc joined by jumper]
W Heat relay
G Fanrelay
C 24VACcommon[3]
S1 Optionaloutdoor/remotesensor
S2 Optionaloutdoor/remotesensor
Cool Only System
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
G Fanrelay
C 24VACcommon[3]
S1 Optionaloutdoor/remotesensor
S2 Optionaloutdoor/remotesensor
2H/2C System (2 transformers)
Y2 Cool relay 2
W2 Heat relay 2
Rc Power (cooling transformer) [1,2]
R Power (heating transformer) [1,2]
W Heat relay 1
Y Cool relay 1
G Fanrelay
C 24VACcommon[3,4]
S1 Optionaloutdoor/remotesensor
S2 Optionaloutdoor/remotesensor
See [notes] below
[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.
Shaded areas below apply only to TH8320/TH8321.
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