41652_model44760_web.pmd
12
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| INSTALLATION | 12 |
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| TABLE A – TERMINAL DESCRIPTIONS |
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| TERMINAL | FUNCTION |
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| LABELS | (HEAT PUMP) | COMMENTS |
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| R | 24V AC supply | Hot wire of 24VAC transformer. Powers the thermostat & system. |
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| Y1 | Compressor stage 1 | Activates the 1st stage compressor. (Heat or Cool for Heat Pumps) |
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| W2 | Auxiliary heating | Activates the 2nd stage (auxiliary) heating when required. |
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| E | Emergency heating | Activates Emergency heating ONLY when the System Switch is in Emergency (em) Mode. |
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| O | Reversing valve | Activates reversing valve in COOL mode. ALWAYS ON in COOL MODE. |
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| (cooling mode) |
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| B | Reversing valve | Activates reversing valve in HEAT mode. ALWAYS ON in HEAT MODE. |
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| (heating mode) |
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| G | Fan | Activates the system Fan. (Can be Auto, On, or Program controlled) |
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| L | System monitor | Activates System Check LED on the front of thermostat. |
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| (Controlled by the system, not the thermostat.) |
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| C | 24V AC common | Common wire of 24V AC transformer. REQUIRED for thermostat operation. |
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13
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| TABLE B |
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| 13 | |
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| HEAT PUMP |
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| EXAMPLES OF DIFFERENT SYSTEM TERMINALS |
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HUNTER |
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| BRYANT, | RHEEM- |
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TERMINALS | CARRIER | COLEMAN | COMFORTMAKER | PAYNE | RUUD | WEATHERTRON | YORK | LENNOX (1) | LENNOX (2) |
R | R | R | R | R | R | R | R | R | |
Y1 | Y or Y1 | Y | Y | Y | Y | Y | Y | Y | M |
W2 | W2 | W2 | W1 | W2 | W2 | W | W1 | Y | |
E | E | E | jumper | E | E | jumper | jumper | E | E |
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| to W2 |
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| to W2 | to W2 |
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O | O |
| O | O |
| O | O | O | R |
B |
| B |
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| B |
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G | G | G | G | G | G | G | G | G | F |
L | L or F | L | L or X | L | L |
| X | L |
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C | C | X | C, X, X1 | C, C1, X1 | X | B | B | C | X |
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| Note: W2 wires |
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| Note: X2 & T |
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| no connection |
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| wires no |
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| connection |
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NOTE: If your heat pump thermostat does not have an E wire, use the provided jumper wire to connect the E terminal to the W2 terminal, as shown in three examples above. Refer to the Wiring Diagram on page 52.