Unical ENERPUMP DHW 110, Installation And Service Manual

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Luxury Air Source Heat Pump-Monobloc System 33
THE UNIT IS ONLY TO BE USED IN A CLOSED WATER SYSTEM. APPLICATION IN AN OPEN WATER
CIRCUIT CAN LEAD TO EXCESSIVE CORROSION OF THE WATER PIPING.
NEVER USE ZN-COATED PARTS IN THE WATER CIRCUIT. EXCESSIVE CORROSION OF THESE PARTS
MAY OCCUR AS COPPER PIPING IS USED IN THE INTERNAL WATER CIRCUIT OF THE UNIT.
WHEN USING A 3-WAY VALVE OR A 2-WAY VALVE IN THE WATER CIRCUIT.
THE RECOMMENDED MAXIMUM CHANGEOVER TIME OF THE VALVE SHOULD BE LESS THAN 60
SECONDS.
Charging water
1. Connect the water supply to a drain and fill valve.
2. Make sure the automatic air purge valve is open (at least 2 turns).
3. Fill with water until the water manometer indicates a pressure of approximately 2.0 bar. Remove air
in the circuit as much as possible using the air-purge valves. Air present in the water circuit might
cause malfunctioning of the optional backup heater.
4. Regarding units with an optional backup heater:
Check that the backup heater vessel is filled with water by opening the pressure relief valve. Water
must flow out of the valve.
NOTE
•
During filling, it might not be possible to remove all the air in the system. Remaining air will be
removed through the automatic air purge valves during first operating hours of the system.
Additional filling with water afterwards might be required.
•
The water pressure indicated on the water manometer will vary depending on the
water-temperature (higher pressure at higher water temperature).
•
However, at all times water pressure should remain above 0.3 bar to avoid air entering the
circuit.
•
The unit might dispose some excessive water through the pressure relief valve.
•
Water quality must be according to EN directive 98/83 EC.
Piping insulation
The complete water circuit, inclusive all piping, must be insulated to prevent condensation during
cooling operation and reduction of the cooling and heating capacity.
If the temperature is higher than 30°C and the humidity is higher than RH 80%, then the thickness of the
sealing materials should be at least 20 mm in order to avoid condensation on the surface of the sealing.