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3.4 Electrical wiring
Note: Verify the local power supply and the operating voltage of the heat pump. It is recommended to use
the included separate circuit breaker for the heat pump, together with the proper wiring characteristics (see
wiring diagram). The current to the heat pump should only be applied when the filter pump is running.
Further connect the electrical supply to the junction box inside the unit. All PRO heat pumps require single-
phase connection.
Grounding: The circuit breaker protects you against electrical shock caused by a possible short circuit
inside the unit. The heat pump in itself is unable to provide a water flow. Therefore, the heat pump must be
wired electrically together with the filter pump to ensure a water flow while the heat pump is running.
3.5 Initial start-up
Startup procedure
After the installation is completed, you should follow these steps:
1. Turn on the filter pump, check for leaks and verify the flow to and from the pool.
2. Turn on the electrical power supply to the unit, then press the ON/ OFF key on the electronic control
panel. The unit should start after the time delay period has lapsed.
3. When the unit has been running for a couple of minutes, check if the air leaving the unit is cooler.
4. Check the performance of the flow switch as follows: with the unit running, turn the filter pump off.
The unit should also switch off automatically. If not, the flow switch needs readjusting. In that case,
please contact the supplier.
5. Allow the unit and filter pump to run 24 hours a day until the desired pool water temperature is
reached. When the set temperature is reached, the unit switches itself off. The unit will now
automatically restart (if the filter pump is running) when the temperature of the pool water drops
more than 1°C below set temperature.
Depending on the starting temperature of the pool water and the air temperature, it can take several days
for the water to reach the desired temperature. Covering the pool of the use of ground insulation can
drastically reduce this period.
Water flow switch
The unit is equipped with a flow switch that is switched on when enough water flows through the unit and
that is switched off when the water flow becomes too low. (E.g. when the filter pump is switched off).
Time delay
The unit is equipped with a built in 3-minute start delay to protect the electrical components and contacts.
After this time delay, the unit will automatically be restarted. Even a brief interruption of the power supply
will activate the start delay and prevent the unit from starting immediately. Additional interruptions of the
power supply during the delay period will have no effect on the 3-minute countdown.
