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CAHA Midi
Installation, Usage and Maintenance Instructions
9. ANNUAL SERVICE
Maintenance should only be done by a qualified installer or technician. The following maintenance routine
should be done annually (see also 9.1)
The appliance is not to be used by children or persons with reduced physical, sensory or mental capabilities,
or lack of experience and knowledge. Children, even if being supervised, must not maintain or clean the
appliance
Put the boiler into operation on max. load (see section 5.5). Determine the heat input of the boiler. Check % CO2 . Compare
the heat input with that measured at installation. If the heat input is now considerably lower then there is probably an ob-
struction in the air inlet or the flue-outlet or in the boiler itself.
Switch off the boiler. First check the air-inlet and the exhaust flue-outlet.
Disconnect from the mains electricity supply. Remove the front cover, top cover and side cover.
Remove the syphon and clean it.
Remove the inspection cover* of the sump on the front side beneath the controls.
The inner part of the sump and the bottom part of the heat-exchanger should be inspected and, if necessary, be cleaned.
If the bottom part of the heat-exchanger is clogged, the inspection covers on the left-hand side of the heat-exchanger
should be removed*. Using a special tool (see figure below) makes it possible to clean the heat-exchanger lids partially . In
case of dirt in the sump it is also advisible to inspect the upper part of the heat-exchanger as well. Remove the fan* togeth-
er with the burner hood*, the gas valve* and the gas pipe*. Now the burner* is visible and can be taken out and inspected.
If necessary clean the cold side with a vacuum cleaner (or carefully with compressed air) and a nylon brush
(never use a
steel brush)
. Inspect the combustion chamber. In case of a dirty heat-exchanger it can be cleaned with water. Check the
burner seal* and replace if necessary.
Refill the condensate trap with clean water and reconnect it.
Check the electrode, especially the distance between the two pins (4,5± 0,5 mm).
Replace electrode if necessary.
Put everything back in its place. Check the CO2-content and correct if necessary.
Check the gas-parts for leakages.
Check the flue-gas parts for flue-gas leakages and condensate leakages.
*Note:
be careful during inspection not
to damage seals. Any seals damaged
by ageing or other causes should be
replaced.