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9
USING YOUR
BOILER
OPERATING THE BOILER
SYSTEM PRESSURE:
This boiler is fitted to a sealed heating system which is pre-pressurised. Your installer will advise you
of the minimum and maximum pressure indicated on the pressure gauge.
4Check regularly that the pressure is maintained.
Optimum system pressure when your boiler is cold
(area A) and the pump is off. The indicated
pressure will change as the pump switches on, for
more accurate readings check pressure when the
pump is not running.
4Contact your installer or maintenance engineer if
a permanent significant decrease or increase in
pressure is indicated on the pressure gauge.
FILLING LOOP:
If the sealed system pressure within your system drops to below 0.5 bar (shown on the pressure
gauge) you will need to increase the pressure to ensure your boiler continues to run without
problems. Your installer should have informed you where to find the filling system and instructed
you in its use.
Once the external filling loop has been located, follow the instructions for re-pressurising the
system.
1. Unscrew blanking cap.
2. Attach the hose to the valves,
screw on hand-tight.
3. Turn the handle/screwdriver slot
through 90° to open valves.
4. The handle/screwdriver slot will
be in line with the valves.
5. When the pressure reaches
between the 1 and 1.5 bar marks
(zone A), turn the
handle/screwdriver slot back,
through 90°, to close the valve.
6. The handle/screwdriver slot will
be at 90° to the valves.
7. Remove the hose and replace
the blanking caps.
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