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The following wiring diagrams show typical terminal identifica- | Relay contacts shown are thermostatically operated. | |||||||||
tion and wiring. For proper installation, refer to the original | ||||||||||
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manufacturer’s instructions. |
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| to terminal C on the thermostat | |
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| Thermostat | is not required if you replace | ||
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| Control | the batteries once a year with | ||
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| Circuit | fresh “AA” Energizer alkaline | |
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| batteries. | ||
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| THERMOSTAT | |
B | O | Y | Y2 | G | W | W2 |
| C* | R | |
| Compressor |
| Heat | |
| Energized |
| Relay | |
| Contactor |
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| in COOL |
| Stage 1 | |
| Stage 2 |
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Energized | Compressor | Fan | Heat | |
Contactor | Relay | |||
in HEAT | Relay | |||
Stage 1 | Stage 2 | |||
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SYSTEM
Hot
24 VAC | 120 VAC |
Neutral
TRANSFORMER
Figure 3. Typical wiring diagram for single transformer systems
| CUT AND | Y | Y2 | G | O |
| TAPE OFF! |
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Hot |
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| Compressor |
| Energized |
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120 VAC | 24 VAC |
| Contactor |
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| in COOL | |||
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Neutral |
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TRANSFORMER |
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| Compressor | Fan |
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B W
Heat
Relay
Stage 1
Energized
in HEAT
Thermostat
Control
Circuit
W2C*
Heat
Relay
Stage 2
*The 24 Volt neutral connection to terminal C on the thermostat is not required if you replace
the batteries once a year with fresh “AA” Energizer® alkaline batteries.
THERMOSTAT
R
SYSTEM
Hot
24 VAC | 120 VAC |
Neutral
TRANSFORMER
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Figure 4. Typical wiring diagram for two-transformer systems with NO safety circuits
Y | Y2 | G | O |
| Compressor |
| Energized |
| Contactor |
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| in COOL | |
| Stage 2 |
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Compressor | Fan |
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Contactor |
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Relay |
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Stage 1
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Thermostat | * The 24 Volt neutral connection | |
to terminal C on the thermostat | ||
Control | ||
is not required if you replace | ||
Circuit | ||
the batteries once a year with | ||
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| fresh “AA” Energizer alkaline | |
THERMOSTAT | batteries. |
B | W | W2 | C* | R |
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| SYSTEM |
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| Heat |
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| Relay |
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| Limit or |
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| Stage 1 |
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| Limit or |
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| 24 VAC | Switches |
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| Switches | 120 VAC |
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Energized |
| Heat |
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| Neutral |
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| 24 VAC |
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| Relay |
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in HEAT |
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| HEATING |
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| Relay N.O. | TRANSFORMER |
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| Contact |
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| Common |
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| Limit or |
| Limit or |
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| Safety |
| Safety | Hot | |
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| Common | 24 VAC | 120 VAC |
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| Neutral | |
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| COOLING |
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| TRANSFORMER |
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Figure 5. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems
3
