2. Open the screw in measuring point 2 of the gas control valve.
3. Connect a pressure gauge to measuring point 2 of the gas control
valve.
4. Switch on the boiler.
5. Set the boiler to low load.
6. Close the boiler gas valve very slowly until error code H.01.09
appears on the display.
7. Compare the measured value with the minimum value in the table.
Tab.127 Minimum gas pressure switch value
C 340
C 640
Minimum value
(mbar)
280
560
14
350
700
13
430
860
10
500
1000
10
570
1140
10
650
1300
10
8. If the measured value is lower, set the gas pressure switch to the
correct value or replace it.
11.4 Specific maintenance work
Perform the specific maintenance work if this proves to be necessary
following the standard inspection and maintenance work. To conduct the
specific maintenance work:
Fig.122 Connect the pressure gauge
AD-3001408-01
10
5/6/7/8/9
2
2
2
3
2
3
Fig.123 Close the gas valve
AD-3001409-01
6
Fig.124 Check the value
AD-3001410-01
X mbar
.....
... m
bar
7
(+)
11 Maintenance
7762666 - v.02 - 29092020
C 340 / C 640
153
