Unical ENERPUMP DHW 72, Installation And Service Manual

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Luxury Air Source Heat Pump-Monobloc System 41
TROUBLESHOOTING
This section provides useful information for diagnosing and correcting certain troubles which may occur
in the unit.
General guidelines
Before starting the troubleshooting procedure, carry out a thorough visual inspection of the unit and
look for obvious defects such as loose connections or defective wiring.
Before contacting your local dealer, read this chapter carefully, it will save you time and money.
WHEN CARRYING OUT AN INSPECTION ON THE SWITCH BOX OF THE UNIT, ALWAYS MAKE SURE
THAT THE MAIN SWITCH OF THE UNIT IS SWITCHED ‘OFF’.
When a safety device was activated, stop the unit and find out why the safety device was activated
before resetting it. Under no circumstances safety devices may be bridged or changed to a value other
than the factory setting. If the cause of the problem cannot be found, call your local dealer/installer.
If the pressure relief valve is not working correctly and needs to be replaced, always reconnect the
flexible hose attached to the pressure relief valve, to avoid water dripping out of the unit!
General symptoms
Symptom 1: The unit is turned ‘on’ but the unit is not heating or cooling as expected
Possible causes Corrective action
The temperature setting is not correct. Check the controller set point.
The water flow is too low.
• Check that all shut off valves of the water circuit are
completely open.
• Check if the water filter needs cleaning.
• Make sure there is no air in the system (purge air).
• Check on the manometer that there is sufficient water
pressure. The water pressure must be >0.3 bar (water is cold),
>>0.3 bar (water is hot).
• Check that the pump speed setting is on the highest speed.
• Make sure that the expansion vessel is not broken
• Check that the resistance in the water circuit is not too high
for the pump.
The water volume in the installation is
too low. Make sure that the water volume in the installation is above
the minimum required value.