Hoval TopGas comfort 10, Руководство по эксплуатации, Страница: 16 / 20

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Checking the water level
8. Checking the water level
If the system pressure is too low (check pressure gauge), inform your installer or top it up with
water.
Refilling the heating system
The heating system can normally be filled and topped up with mains water. In excep-
tional cases, the water quality may vary strongly and it might not always be suitable
for filling the heating system (highly corrosive or very hard water). Please contact a
certified specialist company in such cases.
Follow the procedure below
• Set main switch to "O."
• Open the shut-off valves in the flow and return lines.
• The boiler filling and drain cock is accessible from the underside of the boiler.
• Connect a hose between the filling cock and the water tap:
- Fill the hose with water before establishing the connection to prevent any air from
entering the heating system
- Unscrew the hose again after filling to break the connection reliably.
• Slowly fill with water while checking the water level on the hydrometer or pressure
gauge.
• Open the bleed valves briefly after topping up until all the air has been vented from
the radiator.