Checking The Gas Leakage Monitoring (Vps) - REMEHA Gas 320 Ace Service Manual

7 Maintenance
Fig.63 Negative (-) side of the air pressure
differential switch
12
(+)
14
X mbar
7.3.8

Checking the gas leakage monitoring (VPS)

Fig.64 Preparing the gas circuit
4
3
P1
Fig.65 Connecting a hose
3
5
7
64
10. Remove the syringe hose from the + side of the air pressure
11. Disconnect the silicon hose from the - side (P2) of the air pressure
12. Connect the - side of the air pressure differential switch the hose
13. Pull out the syringe very slowly until error code E.04.08 appears on
10
P (-)
14. Check the pressure indicated by the pressure gauge at that point. This
2
11
P (+)
1
13
AD-3001571-01
Before starting, make sure that the VPS is set correctly. It must be set to
50% of the measured gas inlet pressure, with a maximum of 40 mbar.
The VPS check consists of two actions: checking the VPS for leaks and
checking the switch value. Proceed as follows:
1. Switch off the boiler.
2. Close the boiler gas valve.
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.
AD-3001572-01
5. Open the screw at measuring point 3 on the gas control valve.
6. Connect a hose to measuring point 3 of the gas valve.
5
2 P
3
6
AD-3001573-01
differential switch and reconnect the original hose.
differential switch.
coming from the T piece.
the display.
is the switch pressure.
A switch pressure between -5.5 and -6.5 mbar is good. A lower or
higher switch pressure indicates a problem with the air pressure
differential switch.
measuring point P1.
7734325 - v.07 - 22092022