• Check the venturi (13) for pollution and clean them with
a soft brush in combination with a vacuum cleaner, if
necessary
If the inside of the boiler casing is heavily polluted with
dust, it is likely that the fan impeller is also polluted.
To clean the fan, it has to be removed from the upper tray
and the venturi. Clean the impeller with a soft brush and a
vacuum cleaner. Replace the gasket and take care that the
new gasket is installed properly when reassembling the
fan parts.
Heat exchanger
• Check the heat exchanger for pollution. Clean it, if necessary, with a soft brush and a vacuum cleaner.
Avoid any pollution falling down
TOP-FLUSHING THE EXCHANGER WITH WATER IS NOT ALLOWED.
Reassembly takes place in reverse order.
DURING INSTALLATION PAY ATTENTION TO THE CORRECT POSITION OF THE CLAMP BARS.
THESE HAVE TO BE IN A VERTICAL POSITION.
Note: During routine servicing, and after any maintenance or change of part of the combustion circuit, the following
must be checked: -
Checking the CO
2
Check the CO
2
readings at full load and low load as described on page 22).
Checking flue integrity
The integrity of the complete flue system and the flue seals by checking air inlet sample to eliminate the possibility
of recirculation as described in the installation & servicing instructions.
Checking CO readings and Combustion Performance (CO/CO
2
ratio)
Check CO readings and Combustion Performance as described in the installation & servicing instructions.
The combustion reading (CO/CO
2
ratio) must be less than 0.004. If the combustion reading (CO/CO
2
ratio) is greater
than this, and the integrity of the complete flue system and combustion circuit seals has been verified, and the inlet
gas pressure and gas rate are satisfactory either:-
• Perform the ‘Full Service’
• Perform ‘Setting the Gas Valve’
!
!
13
12
60
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