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Instructions for the installer
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3.24 - BURNER ADJUSTMENT
WARNING!
All the instructions indicated below are for the
exclusive use of qualified UNICAL service
technicians or installers.
All the boilers are supplied already calibrated
and tested. If it is necessary to change the
calibration due to gas conversion or adaptation
to the mains supply system, the gas valve must
be re-calibrated.
A) Max output adjustment
- Connect a suitable C0
2
gas analyser to the sampling
point in the flue inlet/outlet terminal.
- Pressing simultaneously the keys + (plus) and –
(minus) for at least 3 seconds the boiler will operate
in the CH mode at the maximum output (led 1
illuminated).
B) Min output adjustment
- By pressing the key “- decrease” again the boiler will
operate at the minimum output (led 1 blinking).
MAXIMUM OUTPUT
ADJUSTMENT SCREW (A)
- Check that the C0
2
values are within the values
indicated in the table “Burner pressures”
- If necessary correct the value by turning the adjustment
screw “A” in a CLOCKWISE direction to decrease the
value and in an ANTICLOCKWISE direction in order to
increase it.
-To disenable the CHIMNEY SWEEPER MODE
press the keys + (increase) and – (decrease)
simultaneously (led 1 off).
- Check that the C0
2
values are within the values indicated
in the table “Burner pressures”
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