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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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| Contactor |
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| Relay |
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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
Thermostat
Control
Circuit
THERMOSTAT
Y | Y2 | G | O | B | W | W2 | C* | R |
*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.
Compressor | Energized | |
Contactor | ||
in COOL | ||
Stage 2 | ||
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Compressor
Fan
Contactor
Relay
Stage 1
Heat
Relay
Stage 1
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Energized |
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in HEAT |
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SYSTEM
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| Limit or |
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Limit or |
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| Safety | Hot | ||
Safety |
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Switches 24 VAC |
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Neutral
24 VAC |
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Accessory | HEATING |
Relay N.O. | TRANSFORMER |
Contact |
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Common
TWO COMMONS MUST
BE JUMPERED TOGETHER!
| Limit or |
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| Safety |
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| Safety |
| Hot | |
Common | Switches | 24 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
3
