Heat Pump Thermostat O B And C Terminal Variations Explained Youtube Why heat pump o, b and c thermostat terminals can be confusing. o b? b c? what does it all mean? here's the answer . why heat pump o, b and c thermostat terminals can be confusing. o b?. Y, y1, y2: whenever your thermostat calls for cooling, the y wire is used to send a signal to your hvac system telling it to fire up the air conditioner. y1 and y2 wires might be used instead if you have a two stage system (i.e. a high level for extremely hot or cold days, and a low level for mild days). w, w1, w2: just like the y wire, the w.
Heat Pump Thermostat Wiring Explained Colors Terminals Functions G – green: fan – this is for the blower in the air handler. r – red: 24 volt power – your air handler is powered by 110v, but it is converted to 24v for the thermostat. c – blue: common wire for continuous 24 volt power from the thermostat to the air handler. e – white (optional): emergency heat. 6. if you have a heat pump with auxiliary heat, connect the wire labeled “w2” to the “w2” terminal on the new thermostat. this wire controls the second stage of heating and is typically brown. 7. attach the wire labeled “g” to the “g” terminal on the new thermostat. this wire controls the fan and is typically green. R or rc wire (power) connected to the r power terminal to power the thermostat. w wire (heat), connected to the heating control. g wire (fan) connected to the fan control to operate a blower in your hvac system. y1 wire (cooling) connected to the y terminal compressor refrigerant system. Y terminal. the y terminal is the terminal for the cooling relay in the condensing unit for your air conditioner (and heat pumps). when the thermostat calls for the air conditioner the contacts inside the thermostat close and y gets the 24 volt power and passes it to the compressor contactor inside the condensing unit.
Heat Pump Thermostat Wiring Diagrams And Color Code Pickhvac R or rc wire (power) connected to the r power terminal to power the thermostat. w wire (heat), connected to the heating control. g wire (fan) connected to the fan control to operate a blower in your hvac system. y1 wire (cooling) connected to the y terminal compressor refrigerant system. Y terminal. the y terminal is the terminal for the cooling relay in the condensing unit for your air conditioner (and heat pumps). when the thermostat calls for the air conditioner the contacts inside the thermostat close and y gets the 24 volt power and passes it to the compressor contactor inside the condensing unit. Each wire in a heat pump thermostat wiring setup corresponds to a specific thermostat terminal, and each of these wires is typically identified by a different color. however, it’s important to note that these color assignments aren’t always universal and may vary depending on the heat pump manufacturer and the thermostat model. The o terminal, if used when the heat pump thermostat mode selector switch is set to cool, completes the circuit from the r leg of the power supply back to the o wire. it is typically used to bring power to the reversing valve and is used for a heat pump with a reversing valve where the normal (unpowered) position is for heating.
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