THERMOSTAT TERMINALS (Lower)
SYSTEM | E | C | R | W3/A1 | W2 | E2/P | W1 | Y2 | Y1 | B | O | G |
System requiring separate signals for heat (W1, W2) and cool (Y1); gas or electric backup |
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Heat Pump 3** | Emergency | 24 Volt | 24 Volt | Not Used | Heat mode | E2=Emer- | Heat mode | No Output | Cool mode | Energized in | Energized in | Blower/Fan |
| mode | (Common) | (Hot) |
| 2nd stage. | gency mode | 1st stage |
| 1st stage | Heat, Off | Cool mode | Energized on |
| 1st stage |
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| Emergency | constant |
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| Emergency |
| call for Heat |
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| mode | output. |
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| mode |
| and Cool |
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| 2nd stage | P=All other |
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| modes |
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| constant |
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| output |
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** If system does not provide connection to E, jumper W2 to E to provide Aux heating in emergency mode.
11
Installation
