47
Water connections
6.7 Filling / topping up with water
The unit requires the system to be filled with water before start-up or may need to be topped up in special
cases. In both cases follow the procedure:
• connect the water supply to the filling valve and open the valve;
• check that the automatic air vent valve is open (at least 2 turns);
• fill with water until the pressure gauge indicates a pressure of approx. 1.8 bar;
• air in the circuit could cause a malfunction of the additional heater: discharge as much as possible through
the vent valve.
W
CAUTION
If present, the DHW storage tank should only be filled when starting the unit.
L
NOTE
When the system is in operation, do not fasten the black plastic cover on the vent valve on the top of the
unit. Open the air purge valve, turn at least 2 full turns anticlockwise to discharge air from the system.
Fig. 40
L
NOTE
During filling, it may not be possible to discharge all the air from the system: the residual air will be
discharged through the automatic vent valves during the first hours of system operation. It may therefore
be necessary to top up the system water when the unit is switched o. The water pressure indicated on
the pressure gauge varies according to its temperature: water at a higher temperature will have a higher
pressure. Keep the water pressure always > 0.3 bar to prevent air from entering the system.
The unit may discharge water through the pressure relief valve. Check the system pressure periodically.
To Next Page
Loading...
Need help?
General