NOTE
All wiring diagrams are for typical systems only. Refer to equipment manufacturers’ instructions for specific sys- tem wiring information.
!CAUTION
To prevent electrical shock and/or equipment damage, disconnect electrical power at the main fuse box or circuit breaker until installation is complete.
THERMOSTAT
6 | MV | Y | G | W | RC | RH |
SYSTEM
Heating
System
Hot
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| 24 VAC |
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| 120 VAC |
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Neutral
TRANSFORMER
From heating system
From 24 VAC transformer
6W
MV | W |
RC | |
| G |
RH | Y |
RH |
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Thermostat Terminal Connections
Figure 4. Typical wiring diagram for heat only, 2-wire, single transformer systems
6 | MV | Y |
NOTE
RED jumper wire (pro- vided with thermostat) must be connected be- tween thermostat's RH and RC terminals for pro- per thermostat operation with this system.
G
Fan
Relay
JUMPER
WIRE
THERMOSTAT
WRCRH
SYSTEM
Heating
System
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| Hot |
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24 VAC |
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| 120 VAC | |
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Neutral
TRANSFORMER
From 24 VAC
transformer
From heating system
6 | W |
W | RC |
MV | |
G | G |
RH | Y |
RH | From fan relay |
CONNECT red jumper
wire (provided)
Thermostat Terminal Connections
Figure 5. Typical wiring diagram for heat only, 3-wire, single transformer systems
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| From 24 VAC |
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| transformer |
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6 | MV | Y | G | W | RC | RH | THERMOSTAT | 6 |
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SYSTEM |
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| MV |
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| Cooling | Fan |
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| G | ||
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| System | Relay |
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| RC | G | |
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| Hot |
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| Y | |
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| Y | ||
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| 24 VAC | 120 VAC | RH |
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| From fan relay |
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| Neutral |
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| From cooling system | |
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| TRANSFORMER |
| Thermostat Terminal Connections | |||
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Figure 6. Typical wiring diagram for cool only, 3-wire, single transformer systems
6MV
NOTE
RED jumper wire (pro- vided with thermostat) must be connected be- tween thermostat's RH and RC terminals for pro- per thermostat operation with this system.
JUMPER
WIRE
THERMOSTAT
Y | G | W RC | RH |
Cooling
System
Fan
Relay
Heating
System
SYSTEM
Hot
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24 VAC |
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| 120 VAC |
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Neutral
TRANSFORMER
From heating system
CONNECT red jumper
wire (provided)
6 |
| W | W |
MV |
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| RC |
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| G | G |
| RH | Y | Y |
RH |
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| From fan relay |
From 24 VAC |
| From cooling system | |
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transformer |
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Thermostat Terminal Connections | |||
Figure 7. Typical wiring diagram for heat/cool, 4-wire, single transformer systems
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