DeDietrich C 330 Series Installation, User And Service Manual page 62

10 Maintenance
Fig.70 – side of the air pressure differential
switch
3
SLOW
(+)
X mbar
5
62
1
(+)
P
1
(-)
P
2
2
4
-5.5 mbar....-6,5
AD-0000540-01
Checking the air pressure differential switch – side
1. Attach silicon hose on the + side (P1) of the air pressure differential
switch.
2. Disconnect the silicon hose on the - side (P2) of the air pressure
differential switch.
3. Connect the - side of the air pressure differential switch to one end of
the T piece with a hose.
4. Pull out the syringe until the boiler goes into failure mode.
Code / .
5. 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.
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.
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