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10.3.7 Checking the VPS gas leakage control
Checking the VPS for leaks
1. Switch off the boiler.
2. Close the boiler gas tap.
3. Remove the pressure from the gas pipe by unscrewing the screw in
measuring point P1.
4. As soon as the gas pipe is pressure-free, re-tighten the screw.
5. Open the screw at measuring point P2 on the gas valve unit (on the
other side of the VPS pressure switch).
6. Take a large plastic syringe and connect a T piece with a hose
connected to the mouth.
7. Connect one end of the T piece to measuring point 3 of the gas valve
unit.
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
minimum inlet gas pressure value.
10. Check the measured pressure for about 30 seconds. If pressure
decreases by more than half, this indicates a gas leak.
11. Replace the gas valve unit or the VPS if necessary.
Fig.85 Checking the VPS for leaks
AD-0001182-01
SLOW
(+)
X mbar
30 sec
≥ 0.5 x
≤ 0.5 x
12
6
8 10
9
7
5
3
4
P1
P2
P2
10 Maintenance
66 7665063 - v.05 - 18102018
66


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