Wiring a thermostat to a heat pump system requires a clear understanding of each terminal and its function. Unlike conventional heating and cooling setups, heat pump systems include an additional connection - the O/B wire. This signals the system to switch between heating and cooling modes.
When installing a thermostat, connect each wire to its corresponding terminal as illustrated in the diagrams below.
Note: The exact wiring configuration will vary depending on the type of heat pump system you have.
Single-Stage Heat Pump (1H/1C)
- Terminals used: Rc, C, Y1, G, O/B
Single-Stage Heat Pump With Aux Heat (2H/1C)
- Terminals used: Rc, C, Y1, G, O/B, W1 (for AUX)
2-Stage Heat Pump (2H/2C)
- Terminals used: Rc, C, Y1, Y2, G, O/B
2-Stage Heat Pump With Aux Heat (3H/2C)
- Terminals used: Rc, C, Y1, Y2, G, O/B, W1
2-Stage Heat Pump With 2 Stage Aux Heat (4H/2C)
- Terminals used: Rc, C, Y1, Y2, G, O/B, W1, W2
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