Honeywell THX9000 Prestige HD Installation Manual page 5

System-specific wiring guides
Conventional systems
1H/1C System (1 transformer)
C 24VAC common
R Power [1]
Rc [R+Rc joined by jumper]
W Heat relay
Y Compressor contactor
G Fan relay **
Heat Only System [3]
C 24VAC common
R Power [1]
Rc [R+Rc joined by jumper]
W Heat relay
Heat Only System With Fan [4]
C 24VAC common
R Power [1]
Rc [R+Rc joined by jumper]
W Heat relay
G Fan relay
Cool Only System [5]
C 24VAC common
R Power [1]
Rc [R+Rc joined by jumper]
Y Compressor contactor
G Fan relay **
** [See note on page 4]
[1] Power supply. Provide disconnect means and overload protection as required.
[2] Remove jumper (R to Rc) for systems with two transformers. Common connection
must come from cooling transformer.
[3] In Installer Setup, set system type to Heat Only, No Fan.
[4] In Installer Setup, set system type to Conventional with zero cooling stages.
[5] In Installer Setup, set system type to Conventional with zero heat stages.
[6] In Installer Setup, set system type to Conventional with 2 heat AND 2 cool stages.
[7] In Installer Setup, set changeover valve to O or B.
[8] In Installer Setup, set to Heat Pump with 1 compressor stage and no auxiliary heat stages.
[9] In Installer Setup, set to Heat Pump with 1 compressor stage and 1 auxiliary heat stage.
[10] In Installer Setup, set to Heat Pump with 2 compressor stages and no auxiliary heat stages.
[11] In Installer Setup, set to Heat Pump with 2 compressor stages and 1 auxiliary heat stage.
[12] "L" terminal sends a continuous output when thermostat is set to Em. Heat, and acts
as a system monitor when in Heat, Cool or Off modes.
Français : voir la page 17 • Español: vea la página 33
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1H/1C System (2 transformers)
C 24VAC common
R Power (heating) [1]
Rc Power (cooling)
W Heat relay
Y Compressor contactor
G Fan relay **
2H/2C System (1 transformer) [6]
C 24VAC common
R Power [1]
Rc [R+Rc joined by jumper]
W Heat relay (stage 1)
W2 Heat relay (stage 2)
Y Compressor contactor (stage 1)
Y2 Compressor contactor (stage 2)
G Fan relay **
2H/2C System (2 transformers) [6]
C 24VAC common
R Power (heating) [1]
Rc Power (cooling)
W Heat relay (stage 1)
W2 Heat relay (stage 2)
Y Compressor contactor (stage 1)
Y2 Compressor contactor (stage 2)
G Fan relay **
See [notes] below.
[1, 2]
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[1, 2]
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