WIRING DIAGRAMS
Optional Jumper for
Single Stage Heat Pump
O/B | Y | G | W | C |
Changeover |
| Fan |
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Relay* | Compressor |
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Relay |
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| Heat Relay | |||
| Contactor |
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*Changeover Relay is energized in COOL when O/B switch is in the “O” position Changeover Relay is energized in HEAT when O/B switch is in the “B” position
THERMOSTAT
R
SYSTEM
24 VAC |
| Hot |
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| 120 VAC |
Neutral
TRANSFORMER
(Class II Current Limited)
Figure 2. Typical wiring diagram for single transformer single stage systems
NOTE
If safety circuits are in only one of the systems, remove the transformer of the system with NO safety circuits.
CUT AND
TAPE OFF!
HOT
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120 VAC |
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NEUTRAL
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| Optional Jumper for |
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| Single Stage Heat Pump |
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O/B | Y |
| G | W |
Changeover |
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| Fan |
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Relay* |
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| Relay |
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Compressor | Heat Relay | |||
| Contactor | |||
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C
Optional
THERMOSTAT
R
SYSTEM
Limit or
Safety
Switches
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| Hot |
| 24 VAC |
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| 120 VAC | |
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| Neutral |
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TWO COMMONS MUST
* Changeover Relay is energized in COOL when O/B switch is in the “O” position BE JUMPERED TOGETHER! Changeover Relay is energized in HEAT when O/B switch is in the “B” position
TRANSFORMER
(Class II Current Limited)
Figure 3. Typical wiring diagram for two transformer single stage systems with NO safety circuits
Optional Jumper for
Single Stage Heat Pump
O/B Y GWC
Changeover |
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| Fan |
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Relay* |
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| Relay |
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| Compressor |
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| Heat |
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| Contactor |
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| Relay |
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NOTE
Polarity must be observed. If the HOT side of the second transformer is jumpered to the COMMON side of the first transformer a short will be made. Damage to equipment will occur when power is restored.
THERMOSTAT
R
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Limit or |
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Safety |
| 24 VAC |
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| 120 VAC | Switches |
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Switches |
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| NEUTRAL | |||||||||
24 VAC |
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| Auxiliary |
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ACCESSORY |
| Heating |
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RELAY N.O. | Transformer | The |
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CONTACT |
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COMMON |
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TWO COMMONS MUST | Limit or |
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BE JUMPERED TOGETHER! | Safety |
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COMMON | Switches | 24 VAC |
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| 120 VAC |
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* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” positionHeat Pump Transformer (Class II Current Limited)
Limit or
Safety Switches HOT
NEUTRAL
