NOTE | NOTE |
The following wiring diagrams show typical terminal identifica- tion and wiring. For proper installation, refer to the original manufacturer's instructions.
Thermostat
Control
Circuit
Y | Y2 | G | W | W2 | C* |
Relay contacts shown are thermostatically operated.
*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
Compressor |
| Heat | |
Contactor |
| Relay | |
Stage 2 |
| Stage 1 | |
Compressor | Fan | Heat | |
Contactor | Relay | ||
Relay | |||
Stage 1 | Stage 2 | ||
|
SYSTEM
Hot
24 VAC | 120 VAC |
Neutral
TRANSFORMER
Figure 3. Typical wiring diagram for single transformer systems
| CUT AND | Y | Y2 | G |
| TAPE OFF! |
|
|
|
Hot |
|
| Compressor |
|
|
|
|
| |
120 VAC | 24 VAC |
| Contactor |
|
Neutral |
|
| Stage 2 |
|
|
|
|
| |
TRANSFORMER |
|
|
| |
| Compressor | Fan | ||
|
| Contactor | ||
|
| Relay | ||
|
| Stage 1 |
| |
|
|
|
| |
Thermostat
Control
Circuit
W W2C*
Heat
Relay
Stage 1
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 | 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
Contactor
Stage 2
Compressor
Fan
Contactor
Relay
Stage 1
Heat
Relay
Stage 1
Heat
Relay
Stage 2
SYSTEM
|
|
|
|
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|
|
| Limit or |
|
Limit or |
|
|
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|
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|
| |||
|
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|
|
|
| Safety | Hot | ||
Safety |
|
|
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|
| |||
|
|
|
|
|
|
| Switches |
| ||
|
|
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|
| |||
Switches 24 VAC |
|
|
|
|
|
| 120 VAC |
| ||
|
|
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| |||
|
|
|
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|
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|
| |||
Neutral
24 VAC |
|
|
|
Accessory | HEATING | ||
Relay N.O. | TRANSFORMER | ||
Contact |
|
|
|
Common
TWO COMMONS MUST
BE JUMPERED TOGETHER!
| Limit or |
|
|
|
|
|
| Limit or |
|
|
|
| Safety |
|
|
|
|
|
| Safety |
| Hot | |
Common | Switches | 24 VAC |
|
|
|
| 120 VAC | Switches |
|
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| |||
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| |||||||
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| Neutral |
| |
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| |||
|
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|
|
|
| |
|
| COOLING |
|
|
|
|
| ||||
|
| TRANSFORMER |
|
|
| ||||||
Figure 5. Typical wiring diagram for
3
