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Conventional systems
1H/1C System (1 transformer)C24VAC common
R Power [1]
Rc [R+Rc joined by jumper] W Heat relay
Y Compressor contactor **
G Fan relay **
Heat Only System [3]C24VAC common
R Power [1]
Rc [R+Rc joined by jumper] W Heat relay
Heat Only System With Fan [4]C24VAC common
R Power [1]
Rc [R+Rc joined by jumper]
See [notes] below.
C24VAC common
R Power (heating) [1] Rc Power (cooling) [1, 2] W Heat relay
Y Compressor contactor **
G Fan relay **
2H/2C System (1 transformer) [6]C24VAC 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 **
W |
| Heat relay |
| 2H/2C System (2 transformers) [6] | ||
G |
| Fan relay |
| C | 24VAC common | |
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| Cool Only System [5] | R | Power (heating) [1] | ||||
Rc | Power (cooling) [1, 2] | |||||
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C |
| 24VAC common | W | Heat relay (stage 1) | ||
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R |
| Power [1] |
| W2 | Heat relay (stage 2) | |
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Rc |
| [R+Rc joined by jumper] |
| Y | Compressor contactor (stage 1) ** | |
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Y |
| Compressor contactor ** |
| Y2 | Compressor contactor (stage 2) | |
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G |
| Fan relay ** |
| 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.
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