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.
The information below is from Hayward/Summit Heat Pump Troubleshooting Guide and it contains additional troubleshooting and diagnostic information.
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 the water line ‘in’ and ‘out’ connections are correct. 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.
Normal Operation
All of the heat pumps listed above guide are charged with R-410A refrigerant If you have a system that is charged with R-22 refrigerant, and require assistance call Hayward Technical Support Department at 908-355-7995
Refrigerant Operating Pressures
Normal Refrigerant Operating Pressures are:
- Low side 125-135psi. Lower ambient temperatures will result in lower low side (suction) pressures.
- High Side 290-400psi. Higher water temperatures will result in higher high side (discharge) pressures.
Air Temperature Differential
Air Temperature Differential is the difference in the temperature of the air entering the coil (ambient air), and the air being discharged out the top by the fan, and is normally 15-20 degrees Fahrenheit.
Low relative humidity and/or lower than normal ambient temperatures can cause lower than normal temperature differentials.
Measuring the temperature differential is the best way to determine if a heat pump is heating
Water In and Around Heat Pump
The heat pump evaporator coil (the surrounding coil) condenses moisture out out of the surrounding air. As much as 3-5 gallons per hour of run time is common in higher humidity areas. This is normal and in fact increases the efficiency of the heat pump.
The heat pump base pan design allows for a drain line to be attached using readily available components to drain this water away if it is a problem. In most installation situations however, this moisture simply runs off the pad and is absorbed into the ground.
Best Methods to Determine if Heat Pump is Actually Leaking Water
- If the heat pump is leaking, it will continue to leak even when the heat pump is not running. If the water you are seeing is condensation from the evaporator coil it will dry up in a few hours.
- Test the water with a chlorine test strip. If the water shows no or very low levels of chlorine the water is condensation. If the test strip shows levels of chlorine similar to pool water, you may have a leak.
- If you have a sufficient amount of water to test then test it for CYA. If the sample clouds and shows CYA in the water then you have a leak. CYA will not show in condensation.
