Terminals | Conventional | Heat Pump | 2-Pipe Fan Coil | 4-Pipe Fan Coil |
---|---|---|---|---|
R | 24V~ Single Transformer - Heating or Cooling | |||
Rc | 24V~ Dual Transformer - Cooling | |||
Rh | 24V~ Dual Transformer - Heating | |||
C | Common | |||
G | Fan | |||
Y | Stage-1 Cool | Stage-1 Compressor | Valve | Cool Valve |
Y2 | Stage-2 Cool (2nd-speed Fan) | Stage-2 Compressor (2nd-speed Fan) | 2nd-speed Fan | 2nd-speed Fan |
W/AUX | Stage-1 Heat | stage-1 AUX Heat | AUX Heat | Heat Valve |
W2 | Stage-2 Heat (3rd-speed Fan) | stage-2 AUX Heat(3rd-speed Fan) | 3rd-speed Fan | 3rd-speed Fan |
O/B | N/A | Reversing Valve | N/A | N/A |
E | N/A | Emergency Heat | Emergency Heat | N/A |
* | Humidifier/Dehumidifier/W3/AUX3 |
Note:
1. This thermostat supports a 1-wire humidifier/dehumidifier or 2-wire humidifier/dehumidifier. If installing a 1-wire humidifier or dehumidifier, connect it directly to the * terminal. For a 2-wire unit, an additional 24VAC relay is required. We recommend using the 90-290Q model or a similar relay.