Defrost Cycle - Waterco HEAT PUMP SWIMMING POOL HEATERS Owner's Manual

Temperature Differential
It is possible for a temperature variation to occur between the probe and the pool thermostat measurement, due
the quality of the pool thermostat .i.e., the value displayed is different from the temperature displayed on the pool
thermometer. Example: if the water is at 26˚C and the heat pump displays 24˚C.
To calibrate this variation, perform the following procedure;
Read the pool water temperature (ex: 26.6˚C),
Now read the temperature displayed on the heat pump thermostat (24˚C),
To determine the differential subtract the pool water temperature from the heat pump temperature,
26 (80) -24 (76) = 2˚C. Therefore we must compensate for 2˚C.
To calibrate the probe perform the following procedure;
Enter the digital programming mode by simultaneously pressing on the up and down arrows,
Once the temperature displayed is flashing press on the ON/OFF button,
The display will now show the calibration value, which varies -4˚C,
Using the up and down arrows, enter the calibration value, 2˚C. The degree function will flash
for negative values and will not flash for positive values.
Once the calibration has been entered wait until the new temperature appears.
To Start-Up the unit
When the unit is turned on or after a power shut down, the panel lights up and either indicates OFF or the
temperature of the pool water circulating inside the heater. Program in the desired pool water temperature.
Once programmed the fan starts and the compressor starts after a 3 to 5 minute delay.
NOTE: The fan motor and the compressor will start at the same time when the unit has been stopped for a lond period.
To Start the unit
The unit can be stopped by switching off the electrical power supply or by programming the desired water
temperature below the actual pool water temperature.
Initial Heating
The speed of heating is dependent upon five basic factors:
1. Size of the pool.
2. How many degrees the water is to be heated.
3. Ambient air temperature - the warmer the air the less time is required to heat.
4. Use of a solar blanket (see the following section).
5. The size of the heater.
To achieve initial heating your pool heater and pool pump may work up to 24 hours per day until desired
temperature is achieved. The initial heating time may vary depending upon the above five factors. After initial
heating, operating time may be reduced to match daily heat loss.
Pool Solar Blanket
A pool solar blanket should be used whenever possible. Blankets minimise heat loss and conserve heat in your
pool. Like a jacket holds body heat in on a chilly day, or closed doors and windows hold heat in a home, the
blanket controls heat losses. Un-blanketed pools lose 2-3 times more heat than blanketed pools.
Heater Running Time
Most units should be sized to operate during the pool filtering cycle time of 8-12 hours daily, providing an even,
steady flow of warm water. On warmer days the heater will run less because the heat loss will be less. Heat pump
pool heaters are able to operate 24 hours per day when necessary.

Defrost Cycle

When the ambient air temperature is between 3˚C and 7˚C, or if the evaporator is dirty or clearances are not
respected, condensation water on the fins of the evaporator tends to frost. In such a case, the control will activate
the defrost cycle until all the frost is gone. A normal defrost cycle (compressor stopped) lasts between 5 and 10
minutes. The pool heater won't be damaged if it is running at less than 7˚C. In these conditions, the unit will have
more frequent defrosting cycles.
I pg 13
Heat Pump Swimming Pool Heaters