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7 Maintenance
Fig.47
Positive (+) side of the air pressure
differential switch
A
(+)
1
6
(+)
9
X mbar
Fig.48
Negative (-) side of the air pressure
differential switch
A
(-)
2
11
(+)
13
X mbar
7.4
Specific maintenance work
50
5
4
8
AD-3002454-01
10. Remove the syringe hose from the + side of the air pressure
11. Connect the - side (A2) of the air pressure differential switch the hose
12. Pull out the syringe very slowly until error code E.04.08 appears on
13. Check the pressure indicated by the pressure gauge at that point. This
10
12
AD-3002455-01
Perform the specific maintenance work if this proves to be necessary
following the standard inspection and maintenance work. To conduct the
specific maintenance work:
4. Disconnect the silicon hose from the + side (A1) of the air pressure
differential switch.
5. Connect a hose to the + side of the air pressure differential switch.
6. Take a T piece and connect it as follows:
6.1. Connect one end of the T piece to the hose from the + side of
the air pressure differential switch.
6.2. Connect one end of the T piece to a large plastic syringe.
6.3. Connect the other end of the T piece to a pressure gauge.
7. Switch on the boiler.
8. Push the syringe in very slowly until error code E.04.08 appears on
the display.
9. Check the pressure indicated by the pressure gauge at that point. This
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.
differential switch and reconnect the original hose.
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.
7837115 - v.01 - 10012023
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