
28
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Every 3 years Maintenance
Clean the
lambda probe's seal seat
in the boiler.
It must be absolutely
clean
. Inspect it with a torch
and clean out the coupling with a vacuum cleaner.
Clean
The copper washer for sealing the lambda probe's
metal flange and the seat in the boiler must be
replaced when installing the probe.
Tighten the lambda probe securely (with 20 kg and
20 cm lever arm).
Excessive wear on the combustion chamber is often
due to leaky installation of the lambda probe. Leak
air penetrates the boiler and the control system
reduces the air intake too much and the tempera-
tures in the combustion chamber reach forbidden
levels.
Inspect seals on heat exchanger cover
Check the heat exchanger cover's
seals and
replace as needed.
Maintenance by expert, every 3 years
or after alert by control system
In preparation, perform weekly and annual
maintenance
Before this maintenance, all steps of the weekly
and annual maintenance must be performed.
Before starting work, let the boiler cool off
and switch it off with the mains switch.
Check safety devices
Check safety valves, thermal emergency cooling
valve and safety temperature limiter
See
page 23
.
Clean the lambda probe
Use a pipe wrench to unscrew the lambda probe's
retaining tube.
Let the lambda probe cool off and clean it with
a vacuum cleaner. Take special care to clean the
openings in the head of the lambda probe.
Every 3 years
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