WIRING DIAGRAMS
Heating Systems
FAN RELAY
COOLING COMPRESSOR
HEATING CONTROL
HEATING TRANSFORMER
DAMPER OR CHANGEOVER VALVE
(POWERED IN HEAT)
DAMPER OR CHANGEOVER VALVE
(POWERED IN COOL)
COOL TRANSFORMER
G Y W RH B O RC
| Tape Off ** |
| Tape Off * |
Tape Off | 4 | 5 | |
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G |
| H |
| V |
| B |
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| * |
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F |
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| W | R | RC | |
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| RH | ||||
TC | C |
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*If replacing a Honeywell
**If replacing a Honeywell thermostat with a clock wire “C,” tape off wire “C”
Heating/Cooling Systems
4- or 5-Wire with One Transformer
FAN RELAY
COOLING COMPRESSOR
HEATING CONTROL
HEATING TRANSFORMER
DAMPER OR CHANGEOVER VALVE
(POWERED IN HEAT)
DAMPER OR CHANGEOVER VALVE
(POWERED IN COOL)
COOL TRANSFORMER
G Y W RH B O RC
Tape Off |
| * |
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| O |
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| B | ||
| F |
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| V |
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| Y |
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| (Optional) | ||
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| R | RC |
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T |
| G | C | W |
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C |
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* If both Y and C wire are present, tape off “C” wire.
Cooling Systems
FAN RELAY
COOLING COMPRESSOR
HEATING CONTROL
HEATING TRANSFORMER
DAMPER OR CHANGEOVER VALVE
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| (POWERED IN HEAT) | ||
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| DAMPER OR CHANGEOVER VALVE | ||
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| (POWERED IN COOL) | ||
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| COOL TRANSFORMER | ||
G Y W | RH B O RC |
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* | Tape Off | V |
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C | R |
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C |
| C | ||
G | T | R | ||
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Y |
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F |
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*If both Y and C wire are present, tape off “C” wire.
Heating/Cooling Systems
5- or 6-Wire with Two Transformers
FAN RELAY
COOLING COMPRESSOR
HEATING CONTROL
HEATING TRANSFORMER
DAMPER OR CHANGEOVER VALVE
(POWERED IN HEAT)
DAMPER OR CHANGEOVER VALVE
(POWERED IN COOL)
COOL TRANSFORMER
G Y W RH B O RC
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| V | R | C |
Tape Off |
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| O |
| R | |
* |
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| B |
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F |
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| 4 |
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C |
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| (Optional) | ||
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| A | RH |
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TC | G | Y | W |
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*If both Y and C wire are present, tape off “C” wire.
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