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7 Maintenance
Fig.70
Connect the pressure gauge
10
5/6/7/8/9
2
2
3
Fig.71
Close the gas valve
Fig.72
Check the value
(+)
7
X mbar
7.4
Specific maintenance work
66
2
3
2
AD-3001408-01
6
AD-3001409-01
AD-3001410-01
Perform the specific maintenance work if this proves to be necessary
following the standard inspection and maintenance work. To conduct the
specific maintenance work:
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.81
Minimum gas pressure switch value
Gas 320 Ace
285
355
430
500
575
650
8. If the measured value is lower, set the gas pressure switch to the
correct value or replace it.
Gas 620 Ace
Minimum value
(mbar)
570
14
710
13
860
10
1000
10
1150
10
1300
10
7734325 - v.07 - 22092022
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