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Instructions for the installer
3.15 – BURNER PRESSURE ADJUSTMENT
WARNING!
All the instructions indicated below are for the
exclusive use of qualified UNICAL service
technicians or installers.
All the boilers leave the factory 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.
Warning: during this operation do not request
any domestic hot water.
A) MAX OUTPUT ADJUSTMENT
- Remove the cap and connect a suitable C0
2
gas analyser
to the sampling point in the flue inlet/outlet terminal.
- Press the Reset “G” key for at least 3 seconds. The boiler
will operate in the CH mode at the maximum output (led D
= blinking and led E = ON ).
B) MIN OUTPUT ADJUSTMENT
- By pressing the Reset “G” key again the boiler will operate
at the minimum output (led D and led E = blinking).
MAXIMUM OUTPUT
ADJUSTMENT SCREWS
- 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 va-
lue and in an ANTICLOCKWISE direction in order to incre-
ase it.
3 sec.
The chimney sweeper mode remains active for
15 minutes.
To disenable the chimney sweeper mode
before this time has run out, press the Reset “G”
key for at least 3 seconds.
- Check that the C0
2
values are within the values indicated
in the table “Burner pressures”.
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