2
13 
Fig. 1 | 0 | 4 |
|
bar
Normal Pressure |
| 2 | |
1 |
| ||
|
| 3 | |
| Fig. 2 | 0 | 4 |
|
| ||
|
|
| bar |
|
|
| Requires |
|
| Repressurising | |
| 2 |
|
|
1 | 3 |
|
|
Fig. 3 | 0 | 4 |
bar
Fault
3.0Repressurising the System
3.1Central 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.
3.2To 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
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
6© Baxi Heating UK Ltd 2012
