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Installation Guide
4
69-2486—03
Wiring
See [notes] below
[1] Power supply. Provide disconnect means and overload protection as required.
[3] Connectionto24VACcommonatthetransformerisrequired.
[9] See"OptionalTHP9045WiringModule"on page 14 for more details.
Terminal Designations
Conventional Terminal Letters:
R Heating power. Connect to secondary
side of heating system transformer.
Rc Cooling power. Connect to secondary
side of cooling system transformer.
C Common wire from secondary side
of cooling transformer (if 2 transform-
ers).
W 1st stage heat relay.
W2 2nd stage heat relay
Y 1st stage compressor contactor.
Y2 2nd stage compressor contactor.
G Fan relay.
K OptionalTHP9045WiringModule
Terminal [9]
Heat Pump Terminal Letters:
R Heating power. Connect to secondary
side of heating system transformer.
Rc Cooling power. Connect to secondary
side of cooling system transformer.
C Common wire from secondary side of
cooling system transformer.
Y 1st stage compressor contactor.
Y2 2nd stage compressor contactor.
Aux Auxiliary heat relay.
G Fan relay.
E Emergency heat relay.
L Heat pump reset (powered continu-
ously when System is set to Em Heat;
system monitor when set to Heat,
Cool or Off).
O/B Changeover valve for heat pumps.
K OptionalTHP9045WiringModule
Terminal [9]
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]
K OptionalTHP9045WiringModule
Terminal [9]
Heat Only System
Rc Power [1]
R [R+Rc joined by jumper]
W Heat relay
C 24VACcommon[3]
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]
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]
K OptionalTHP9045WiringModule
Terminal [9]
Wiring guide—conventional systems