10.2.12 Checking The Vps Gas Leakage Control - DeDietrich C 330 Series Installation, User And Service Manual

Fig.71 Checking the VPS for leaks
1
P1
3
4
10 5/6/7/8/9
3
6
8 (+)
X mbar
30 sec
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10.2.12 Checking the VPS gas leakage control

1. Switch off the boiler.
2. Close the boiler gas tap.
3. Remove the pressure from the gas pipe by unscrewing the screw in
2
4. As soon as the gas pipe is pressure-free, re-tighten the screw.
5. Open the screw at measuring point 3 on the gas valve unit (on the
6. Take a large plastic syringe and connect a T piece with a hose
7. Connect one end of the T piece to measuring point 3 of the gas valve
8. Connect the other end of the T piece to a pressure gauge.
9. Push the syringe in very slowly until the pressure gauge indicates the
10. Check the measured pressure for about 30 seconds. If pressure
11. Replace the gas valve unit or the VPS if necessary.
5
2 P
7
3
9
SLOW
≥ 0.5 x
≤ 0.5 x
AD-0000541-01
Checking the VPS for leaks
measuring point P1.
other side of the VPS pressure switch).
connected to the mouth.
unit.
minimum inlet gas pressure value.
decreases by more than half, this indicates a gas leak.
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