Unical MODULEX EXT 100, Installation And Servicing Instructions

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46
Instructions for the installer
Follow this procedure also for the other
burners
If the CO
2
percentage is too low, check if the air and smoke ducts
are not obstructed. If they are not obstructed, check if the burner
and/or the exchanger (aluminium sections) are well cleaned.
C) COMPLETION OF THE BASIC ADJUSTMENTS
-
Check the C0
2
values at the minimum and maximum outlet
- If necessary make the required adjustments
To ensure correct operation the C0
2
values
have to be adjusted with extreme care respec-
ting the values indicated in the table.
- Close the sampling test point in the flue outlet terminal
Do not force the end switches of the
adjusting screw.
In case of gas valve replacement or difficult
ignition:
Tighten the maximum adjustment screw “A”
in a clockwise direction until you arrive to
the abutting end, than slacken for 9 turns.
Verify the boiler ignition; if the boiler goes
into lockout slacken the screw “A” again
of one turn, than retry the ignition. If the
boiler goes into lockout again, carry out the
above indicated operations until the boiler
is lighted.
At this point carry out the burner adjustment
as previously indicated.
WARNING
To calibrate the VG (Gas Valve) when
boiler is placed in the boiler room,
follow the procedures described in
instruction manual (chap. Burner
adjustment).
NOTE
Calibration of VG must be done with
chimney draught = 0 pa;
for this reason, open the inspection
door of duct smoke 1 .
When the calibration is finished, restore sealing of
the door.