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Heat Pumps for Heating and Cooling 1.6. Operation of a Heat Pump in Heating Mode In heating mode, the refrigerant (upon leaving the compressor via the red line in the figure below) first flows through the reversing valve where it is directed to the indoor coil. Since the refrigerant always flows to the condenser first after leaving the compressor, the indoor coil is acting as the condenser. In this mode of operation, the heat from the refrigerant is rejected to the air in the occupied space. From the indoor coil, the refrigerant flows through the expansion device and then to the outdoor coil, where the refrigerant picks up or absorbs heat from the outside air. The refrigerant then flows back to the compressor via the reversing valve and the cycle repeats itself. The outdoor coil of the heat pump will gather low-temperature heat from environment, where that heat is freely available and abundant (ground, water or air). The condenser side will always deliver higher temperature heat to the load. Important − The reversing valve is always installed at the discharge port (high pressure) of the compressor at tube “A” and the return port (low pressure is always connected to tube “B”. Therefore, tube A always has higher pressure refrigerant, and tube B always has lower pressure refrigerant. − All reversing valves use an electromagnetic solenoid which requires 24VAC to energize. 99% of the reversing valve failures are due to bad or faulty electrical coil and not because the valve itself has failed. Replacing the 10PDF Image | Heat Pumps for Heating and Cooling
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