Checking the air pressure differential switch – side
1. Disconnect the short, dark-coloured silicon hose on the – side (P2) of
the air pressure differential switch.
2. Connect the – side of the air pressure differential switch to one end of
the T piece with a hose.
3. Pull out the syringe until the boiler goes into failure mode.
4. Make a note of the pressure indicated by the pressure gauge at that
point.
A switch pressure of between - 5.5 and - 6.5 mbar is fine. A lower or
higher switch pressure indicates a problem with the air pressure
differential switch.
5. After taking a measurement, detach the silicon hose from the T-piece
on the – side and reconnect the coloured hose that was previously
removed.
6. Remove any soiling from all connection points for hoses and the air
pressure differential switch.
7. Check the condition and tightness of the hoses of the air pressure
differential switch.
Replace the hoses if necessary.
Fig.84
– side of the air pressure differential
switch
AD-0001076-01
SLOW
3
X mbar
....
....
m
ba
r
4
-5.5 mbar....-6,5
(+)
P
1
(+)
1
2
P
2
(-)
10 Maintenance
7665063 - v.05 - 18102018
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