DeDietrich C 330 Series Installation, User And Service Manual page 64

10 Maintenance
Fig.72 Checking the VPS switch value
10 5/6/7/8/9
1
2
3
10 sec
1
3
10 sec
5/6 7/8/9
3
VPS
VPS
GPS
SLOW
(+)
X mbar
64
2
2
3
2
3
10
3 3
GPS
VPS
GPS
4
3
2
5 5
0 Ohm
6
AD-0000542-01
Checking the VPS switch value
1. Remove the pressure from the gas valve unit; first remove the hose
that is attached to measuring point 3 of the gas valve unit (on the
other side of the VPS pressure switch).
2. Wait approximately 10 seconds and reconnect the disconnected hose
to measuring point *3 of the gas valve unit.
3. Remove the connecting plug from the VPS gas leakage control.
4. Connect an ohmmeter to terminals 2 and 3 of the VPS.
5. Push the syringe in very slowly until the ohmmeter indicates 0 Ohm.
6. Make a note of the pressure indicated by the pressure gauge at that
point. If the measured pressure differs by more than 2 mbar from the
VPS set-up value, set the pressure switch to the correct value or
replace it.
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