Repressurising System - Potterton Heatmax Combi HE Range User's Manual And Important Warranty Information

Fig. 1
Fig. 2
Fig. 3
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© Baxi Heating UK Ltd 2012
2
1
3
4
0
bar
Normal Pressure
2
1
3
0 4
bar
Requires
Repressurising
2
1
3
0 4
bar
Fault

3.0 Repressurising System

3.1 Central Heating System Pressure
1. The water pressure in the central heating system is
indicated by the pressure gauge.
2. With the system cold and the boiler not operating the
pressure should be at least 0.5 bar. During operation the
pressure should not exceed 2.5 bar, and will normally be
between 1.0 and 2.0 (Fig. 1).
3. A pressure of 3 or greater indicates a fault. The safety
pressure relief valve will operate, at a pressure of 3 (Fig. 3). It
is important that your Installer or Service Engineer is
contacted as soon as possible.
4. The minimum pressure for correct operation is 0.5. If the
pressure falls below 0.5, this may indicate a leak on the
central heating system (Fig. 2). Error Code E119 will be
shown on the display.
3.2 To Re-Pressurise the System
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. Look at the boiler from underneath. A filling
device (the filling loop) will be fitted to two of the boiler
isolation cocks.
3. If you are unsure of its position, or cannot identify it,
consult the installer who fitted the boiler.
4. The filling loop consists of two taps (on the isolation cocks)
and a separate copper pipe with connection fittings. This
copper pipe should have been left for safe keeping after the
boiler was installed.
5. Only when repressurising should the copper pipe be
connected between the two taps. Ensure that the nuts on
the pipe ends are tightened onto the taps.
6. Fully open one of the taps first, and then while observing
the pressure gauge, carefully open the second tap.
7. When the needle on the gauge is indicating 1 or more turn
both taps firmly off.
8. Disconnect the copper pipe from the taps (a small amount
of water may be present) and remove it. Keep the pipe in a
safe place for future use.