eta ePE-K - Heat Exchanger Cleaning and Seal Check; Heat Exchanger Tubes Check

30 www.eta.co.at
Maintenance (expert) Cleaning and maintenance
Cleaning the heat exchanger
Strip off the ashes on the inner walls with the poker and
remove the fly ash with an ash vacuum, for example.
Fig. 2-63: Heat exchanger
Checking the heat exchanger tubes
Check the heat exchanger tubes and the turbulators
for "tar deposits" (shiny soot).
Fig. 2-64: Heat exchanger tubes
Tar deposits can have several causes, for
example:
• leak air through the heat exchanger cover, the
combustion chamber door or the lambda probe.
• an incorrectly calibrated lambda probe
• Insufficient boiler runtime (start-stop operation)
Checking the seal on heat exchanger cover
Check if the seal on the heat exchanger cover is intact
and replace if necessary.
Fig. 2-65: Heat exchanger cover
CAUTION!
Do not operate with damaged seals
Never operate the boiler with damaged seals.
Otherwise, unwanted air is sucked in, disturbing the
combustion process and causing increased wear.
 Always replace damaged seals immediately.
Closing the heat exchanger cover
Replace the heat exchanger cover and tighten the nuts
alternately and evenly.
Fig. 2-66: Heat exchanger cover
Replace the insulation on the heat exchanger cover.
Fig. 2-67: Insulation