Hayward Heat Pumps
Hayward has sold many different models over the years.
Hayward round heat pumps include models HP20654T, HP20654BT, HP20654TC, HP20854T, HP20854BT, HP20854TC, HP21104T, HP21104TC.
Hayward square heat pumps include models SUM25TA, SUM3TA, SUM3TAC, SUM4TA, SUM4TAC, SUM5TA, SUM5TAC SUM8TA, HML50TA, HML65TA, HML65TAC, HML80TA, HML80TAC, HML110TA HML110TAC, HML125TA, HET50BTA, HET65BTA, HET110BTA, HET125BTA HCB50BTA, HCB65BTA, HCB65BTAC, HCB80BTA, HCB80BTAC, HCB110BTA, HCB110BTAC, HP50TA, HP21004T, HP21124T, HP21204T, HP21404T, SUMXL112, SUMXL140.
Sequence of Operation
Round Heat Pumps and Square heat pumps generally operate in the same fashion. Power is connected to the contactor per the installation instructions. Ensure correct water line ‘in’ and ‘out’ connections. Set the control for pool or spa operation. Adjust the thermostat setpoint above the water temperature. In approximately 3 to 5 minutes the heat pump will begin ‘heating’. This 3 to 5-minute delay is essential as it protects the compressor from short cycling. This time delay is part of the control circuit of the heat pump.
Round units have a 5-minute delay during which no operation will occur.
Square units have a 3-minute delay, but the fan will come on immediately once the heat pump is turned on and the thermostat is raised to a setpoint above the pool temperature.
The time delay will delay the start of the heat pump any time power is interrupted to the heat pump. When the heat pump satisfies the thermostat and shuts off, the delay will not allow the heat pump to restart for 3-5 minutes.
The thermostat will turn the heat pump on and off to keep the pool at the desired temperature.
Heat pumps will not operate when the pool pump is off.
