Hayward HeatPro® Heat Pro All Models - Page 4

Heat Pump Pool / Spa Heater Owner's Manual Get Familiar with Your Heat Pump Safety Features Hayward heat pumps are equipped with safeguards that will stop operation to protect your unit in case of the following events: • Excessively high refrigerant pressure • Excessively high water temperature • Loss of refrigerant • Fan Motor Failure • Evaporator Freeze-up • Low Ambient Temperature • Refrigerant line blockage or overcharging High / Low Refrigerant Pressure Switches • The high-pressure switch senses the refrigerant pressure in the sealed refrigeration system and shuts the heater down in the event unsafe operating pressures are reached. The heat pump will automatically reset after the system pressure drops back to normal operating pressures. When this switch is tripped, digital displays will read "HP" • The low-pressure switch senses the refrigerant pressure in the sealed refrigeration system to protect against certain conditions that could be detrimental to compressor life. The switch shuts the unit down in the event of loss of refrigerant, fan motor failure, evaporator freeze-up and airflow blockage. The switch automatically resets when the pressure rises to normal operating pressures. The display will show "LP" if this switch is tripped. Evaporator Freezing The low-pressure switch will shut the heat pump down when the evaporator starts to freeze. When the unit starts to freeze the low-pressure switch will be tripped, causing the display to read "LP" This will prevent the evaporator from becoming damaged or deformed. Water Pressure Switch The water pressure switch contacts close when pressure is applied as pool water flows through the heat exchanger. Low flow rates as well as no flow will let these contacts open and this will cause the unit to shut down. The display will read "PS" if the water pressure is not sufficient. Time Delay All models use a 5-minute time delay to prevent repeated tripping of the compressor thermal overload, which is caused by attempting startup before system pressures are equalized. Any interruptions, outside of power loss, will result in a 5-minute time delay. Low Ambient Temperature If the air outside the heat pump is not warm enough to produce heat, the system will shut down. The actual point at which your unit will shut down due to low temperature varies depending on which model you purchased, current weather conditions, and the amount of sunlight reaching the heat pump. The shutdown can occur anywhere within a wide range of temperatures, usually 45≡F-55≡F. This is not a "fixed" range. We stress that climate conditions, sunlight, and various models respond quite differently to low ambient temperature. A shutdown occurs because low temperatures will activate the systems low-pressure safeguard switch (digital thermostats will display a code "LP".) The unit will start up again when the temperature has raised enough to reset this switch. Note: Low ambient temperature does not necessarily affect the Chiller models or the cooling cycle of the heat/cool units. 3