These units are essentially air conditioners that run in reverse.
Instead of removing the heat from inside a house and dumping it outside, heat is removed from the outside air and transferred to the swimming pool water via an exchange mechanism.
“Air Source” Heat Pumps utilize the sun’s free heat by collecting and absorbing energy from the outside air. This energy is then compressed and transferred to the pool water.
Your existing pool pump circulates the water through the heater and warms the pool. The FAN circulates air through the outer EVAPORATOR AIR COIL that acts as a heat collector. The liquid refrigerant in the air coil absorbs the available heat in the ambient air transforming it into a gas. The refrigerant gas is then pumped into the COMPRESSOR. When this warmed gas is compressed, it intensifies or concentrates the heat like a magnifying glass in the sun. This intensely hot gas is then pumped into the HEAT EXCHANGER CONDENSER where the actual heat transfer takes place.
As the pool water passes through the heat exchanger, the hot gas gives up its heat to the cooler pool water. The refrigerant returns to a liquid state and is pumped through the EXPANSION VALVE then into the evaporator air coil to start the process all over again.