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| 2 WIRE 24 VOLT/MILLIVOLT SYSTEM |
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| SYSTEM COMMON |
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| JUMPER PROVIDED | ||||
W | Y |
| G | B | O | RC | RH |
| C |
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| 24 VOLT | OPTIONAL | |
| HEAT |
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| HEAT |
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| TRANSFORMER |
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| 120 VAC |
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| 3 WIRE HEATING SYSTEM (3RD WIRE FOR FAN) |
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| SYSTEM COMMON |
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W | Y |
| O | RC | JUMPER PROVIDED | ||||
| G | B | RH |
| C | ||||
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| 24 VOLT | OPTIONAL | |
HEAT |
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| FAN |
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| HEAT |
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| TRANSFORMER |
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| 120 VAC |
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| 3 WIRE COOLING SYSTEM |
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| SYSTEM COMMON |
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| JUMPER PROVIDED | ||||
W | Y |
| G | B | O | RC | RH |
| C |
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| 24 VOLT | OPTIONAL | ||
| AC |
| FAN |
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| COOL |
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COMPRESSOR |
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| TRANSFORMER |
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| 120 VAC |
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WIRING DIAGRAM NOTES (APPLIES TO ALL DRAWINGS)
*Verify whether “C”, “X” or “B” wires are connected to system common.
*If “B” and “O” are both present, it is likely that “B” is a system common.
*If a “B” wire in your system is a common, then connecting it to the “B” terminal may cause damage to your system.
*If “Y” and “C” are both present, it is likely that “C” is a system common.
*Use an optional common wire to allow the system to power your thermostat.
| 4 WIRE HEATING AND COOLING SYSTEM |
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| SYSTEM COMMON |
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W | Y | O | RC | JUMPER PROVIDED | |||
G | B | RH | C | ||||
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| 24 VOLT | OPTIONAL | |
HEAT | AC | FAN |
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| SYSTEM |
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COMPRESSOR |
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| TRANSFORMER | |||
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| 120 VAC |
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5 WIRE SYSTEM HEATING AND COOLING - 2 TRANSFORMERS | |||||||
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| SYSTEM COMMON |
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W | Y | O | RC | JUMPER REMOVED | |||
G | B | RH | C | ||||
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| OPTIONAL |
HEAT | COOLING | FAN |
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| 24 VOLT |
| 24 VOLT |
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| COOL |
| HEAT | |||
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| TRANSFORMER | TRANSFORMER | ||
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| 120 VAC |
| 120 VAC |
| SINGLE STAGE HEAT PUMP SYSTEM | ||||||
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| SYSTEM COMMON |
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| JUMPER PROVIDED | |||
W | Y | G | B* | O* | RC | RH | C |
ADD |
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| OPTIONAL |
JUMPER |
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| HEAT | FAN | CHANGEOVER | CHANGEOVER | 24 VOLT | ||
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| PUMP | HEAT |
| COOL |
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| TRANSFORMER | ||||
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*"B" OR "O" BUT NEVER BOTH |
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| 120 VAC | ||
10 |
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| 11 |
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