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4.15 Description of the function
of the air pressure monitor
Fig. 26: Description of function of the air pressure monitor (schematic drawing)
In boiler operation the exhaust gas air pressure monitor (1) monitors the differen-
tial pressure between the condensate bowl and trim (3). If this differential pres-
sure exceeds a value of 6 mbar, the burner is shut off and the error message "132"
is displayed.
Causes:
- plugged siphon
- plugged exhaust gas pipe
- plugged air filter
- plugged suction pipe
After the burner shuts off this differential pressure is no longer present and the
error message "132" disappears. The burner restarts. During the pre-venting the
pressure switch 2 is queried. If the differential pressure set on the trim air pressure
monitor (2) is not reached via the trim (3), there is a malfuntion shut down (error
message "162 air pressure monitor") and the boiler is locked.
Prior to installation
3
3
9
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