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.