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 unit’s internal water circuit.
2.8 Charging water
■ Connect the water supply to a drain and fill valve.
■ Make sure the automatic air purge valve is open (at least 2 turns).
■ Fill with water until the manometer indicates a pressure of approximately 1.0~2.0 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 auxiliary heater.
■ Check that the auxiliary heater vessel is filled with water by screw off the vent valve two laps, it
will be full of water until finish draining off the air.
NOTE:
● During filling, it might not be possible to remove all air in the system. Remaining air will be
removed through the automatic air purge valve during first operating hours of the system.
Additional filling with water afterwards might be required.
● The water pressure indicated on the manometer will vary depending on the water temperature
(higher temperature 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.
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