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Heat Pump Pool / Spa Heater Owner’s Manual
3
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.