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Cleaning (customer) Cleaning and maintenance
2.5.5 Clean flue gas ducts
Remove the cover on the top
Remove the cover from the top of the boiler.
Fig. 2-27: Cover
Checking the air valve for flue gas recirculation
Actuate the air valve actuator manually and check that
it moves smoothly.
Fig. 2-28: Actuator of flue gas recirculation
For manual actuation, push the unlocking device (red
button) and turn the drive 90° with the locking screw.
Fig. 2-29: Manually actuating the actuator
If the actuator is difficult to move, remove it.
Fig. 2-30: Actuator
Clean the PTFE sealing washer on the air valve or
replace it if damaged.
Fig. 2-31: PTFE sealing washer
Clean the sealing area for the air valve on the inside of
the flue duct.
Fig. 2-32: Sealing area
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