3.6. WIRING DIAGRAMS
2 + 3 WIRE HEATING SYSTEMS
JUMPER
PROVIDED
W Y G B O RC
RH C
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| COMMON |
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| W |
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| G |
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| RC |
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| R | |||
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| SYSTEM | |
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| POWER |
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NOTE: "G" WIRE IS
OMITTED FOR
2 WIRE SYSTEMS
HEATING/COOLING SYSTEMS
5 + 6 Wire 2 Transformers
JUMPER
REMOVED
W Y G B O RC
RH C
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| COMMON |
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| Y |
| G |
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| B* |
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| O |
| RC |
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| RH |
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| R |
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| H |
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| C* |
| F |
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| SYSTEM | |||||
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| POWER | |||
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COOLING SYSTEMS
JUMPER
PROVIDED
W Y G B O RC
RH C
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| COMMON |
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| R |
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| SYSTEM |
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| C* |
| F |
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| POWER |
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| 6 |
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HEATING/COOLING SYSTEMS
4 + 5 Wire 1 Transformers
JUMPER
PROVIDED
W Y G B O RC
RH C
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| COMMON |
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| W |
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| Y |
| G |
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| B* |
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| O |
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| RH |
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| RC |
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| C* |
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| R | ||||
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| SYSTEM | |||||
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| V | |||
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| POWER |
| 4 |
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WIRING DIAGRAM NOTES (APPLIES TO ALL DRAWINGS)
*The DASHED lines are optional depending upon 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 the system to power your thermostat.
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