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11
- the combustion check.
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- Turn the mode selector to
to turn off the boiler
- Undo the screws (
%
) that fasten the shell
%
- Move the housing base forwards and then upwards to unhook it
from the frame
- Turn the instrument panel forward
- Undo by two turns the screw of the pressure test point upstream
from the gas valve and connect the pressure gauge
Pressure test
point
upstream of the
valve
- Power the boiler electrically by setting the main system switch
to “ON”
- Bring the mode selector to summer
- Turn the DHW temperature selector to maximum. Make sure that
the water in the storage tank is not at temperature
- Fully open the hot water tap
- With the burner at maximum output, check that the gas pressure
is comprised between the minimum and rated power supply
pressure values indicated in the table
- Turn off the hot water tap
- Disconnect the pressure gauge and tighten the pressure test
point screw again upstream from the gas valve.
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To carry out the combustion analysis, proceed as follows:
- turn the mode selector to
to turn off the boiler
- turn the DHW adjustment selector to the combustion analysis
mode position
- wait for the burner to fire (approx. 6 seconds). “ACO” is displayed
and the boiler operates at the maximum heating output
- remove the screw and the cover on the air distribution box (see
image below)
- insert the flue gas analysis probe into the sockets provided on
the air box
- check that the CO
2
values correspond to those indicated in the
"Technical data" table, if the value displayed is different, modify
as indicated in chapter "Gas valve calibration"
- perform the combustion check.
cover
screw
Then:
- remove the analyser probe and close the combustion analysis
sockets with the screw.
