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3. SYSTEM WATER PRESSURE
The system pressure gauge (G - see page 4) indicates the central heating system pressure.
If the pressure is seen to fall below the original installation pressure of 1-2 bar over a period
of time and continue to fall then a water leak may be indicated. In this event re-pressurise the
system as shown below. If unable to do so or if the pressure continues to drop a Gas Safe
Registered Engineer or in IE a Registered Gas Installer (RGII) should be consulted.
THE BOILER WILL NOT OPERATE IF THE PRESSURE HAS REDUCED TO LESS THAN 0.3 BAR UNDER THIS CONDITION.
To Top up the system :-
A
B
1.
Ensure both
&
(as shown below)
2.
Remove the plug and cap and retain.
3.
Connect the filling loop to the Domestic Hot Water (DHW) inlet
and tighten. Also ensure that the other end of filling loop is
hand tight.
Starting Position
Filling
Loop
Cap
Filling Loop
Handle
(Blue)
handles (blue) are in closed position
Domestic Hot Water
(DHW) Inlet Valve
A
Plug
B
4.
Turn the Domestic Hot Water (DHW) Inlet
to the horizontal position.
5.
Ensuring no leaks are seen, gradually turn the filling loop
handle (blue)
B
6.
Wait for the pressure gauge to reach 1 to 1.5 bar.
7.
Once pressure is reached turn valves
the closed position.
8.
Disconnect the filling loop, replace cap and plug. Note
there can be some water spillage at this point.
Filling Position
Filling Loop
7
A
to the horizontal position.
A
Cap
A
Plug
B
blue handle
&
back to
B
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