Unical ENERPUMP DHW 72, Инструкция по установке и обслуживанию

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Luxury Air Source Heat Pump-Monobloc System 42
Symptom 2: The unit is turned ‘on’ but the compressor is not starting (space heating or domestic
water heating)
Possible causes Corrective action
The unit must start up out of its
operation range (the water
temperature is too low).
In case of a low water temperature, the system utilizes the
backup heater to reach the minimum water temperature first.
• Check that the backup heater power supply is correct
• Check that the backup heater thermal fuse is closed.
• Check that the backup heater thermal protector is not
activated.
• Check that the backup heater contactors are not broken.
Symptom 3: Pump is making noise (cavitation)
Possible causes Corrective action
There is air in the system. Purge air.
Water pressure at pump inlet is too
low. • 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 manometer is not broken.
• Check that the expansion vessel is not broken.
• Check that the setting of the pre-pressure of the expansion
vessel is correct (refer to: "Setting the pre-pressure of the
expansion vessel").
Symptom 4: The water pressure relief valve opens
Possible causes Corrective action
The expansion vessel is broken. Replace the expansion vessel.
The water volume in the installation is
too high. Make sure that the water volume in the installation is under
the maximum allowed value (refer to: "Checking the water
volume and expansion vessel pre-pressure").
Symptom 5: The water pressure relief valve leaks
Possible causes Corrective action
Dirt is blocking the water pressure relief
valve outlet. Check for correct operation of the pressure relief valve by
turning the red knob on the valve counter clockwise:
• If you do not hear a clacking sound, contact your local
dealer.
• In case the water keeps running out of the unit, close both
the water inlet and outlet shut-off valves first and then
contact your local dealer.