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3.0 Repressurising the System
6
© Baxi Heating UK Ltd 2012
bar
0
1
2
3
4
bar
0
1
2
3
4
Fig. 1
Fig. 2
Normal Pressure
Requires
Repressurising
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. Look at the boiler from underneath. There will be two taps,
one connected to the cold inlet valve and one to the central
heating return valve. Do not operate these taps yet !
2. Your installer will have left a short copper pipe with wing
nuts (the ‘filling loop’) with you for safe keeping.
3. To re-pressurise this loop MUST be connected to the taps.
Remove the blanking caps from each tap and set aside.
4. Ensure that the two seals are fitted, and connect the loop to
the taps with the wing nuts. These should be hand tightened.
5. Carefully open both taps and check the boiler pressure
gauge. Once the needle on the gauge is above the 0.5 mark
both taps can be closed.
6. Undo the two wing nuts, remove the loop and refit the
blanking caps. Put the loop in a safe place for future use, and
ensure that the seals remain in place
bar
0
1
2
3
4
Fault
Fig. 3