2 WIRE, 24 VOLT AND MILLIVOLT HEAT ONLY SYSTEMS
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| SYSTEM COMMON |
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W | Y |
| O | RC |
| JUMPER PROVIDED | |||||||||||
G | B |
| RH | C | |||||||||||||
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HEAT |
| 24 VOLT | OPTIONAL |
HEAT |
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TRANSFORMER
120 VAC
3 WIRE HEATING SYSTEM (3RD WIRE FOR FAN)
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W | Y | SYSTEM COMMON |
| O | RC |
| JUMPER PROVIDED | ||||||||||
G | B |
| RH | C | |||||||||||||
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HEAT |
| FAN |
| 24 VOLT | OPTIONAL |
HEAT |
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TRANSFORMER
120 VAC
WIRING DIAGRAM NOTES (APPLIES TO ALL DRAWINGS)
* The DASHED wires |
are optional depending |
on your system type. |
* 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 |
WY
AC
COMPRESSOR
3 WIRE COOLING SYSTEM
SYSTEM COMMON |
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G | B | O | RC |
FAN | 24 VOLT |
COOL |
TRANSFORMER
JUMPER PROVIDED
RH C
OPTIONAL
the system to power |
your thermostat. |
120 VAC
10
