3.1 Central Heating System Pressure
1. The normal operating water pressure is
between 1 and 2.5 bar (Fig. 1). If the pressure
exceeds 3 bar the safety pressure valve will
operate and a fault is indicated. Contact your
installer.
2. It may be necessary to repressurise the system
occasionally (Fig. 2). A filling device (the filling
loop) is fitted on the boiler itself.
3. The filling loop consists of two taps and a
separate metal braided hose pipe.
4. Only when repressurising should the hose be
connected between the two taps. No tools are
necessary for this, but ensure that the wing nuts
on the hose pipe ends are tightened onto the
taps.
5. Fully open one of the taps first, and then while
watching the pressure gauge, carefully open the
second tap.
6. When the needle on the gauge is indicating 1
or more, turn both taps off.
7. Disconnect the hose from the taps (a small
amount of water may be present) and remove it.
Keep the hose in a safe place for future use.
Fig. 1
Fig. 2
Normal Pressure
Requires
Repressurising
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