30
Instructions for the installer
3.14 - BURNER PRESSURE ADJUSTMENT
WARNING!
All the instructions indicated below are for the
exclusive use of qualified
UNICAL service te-
chnicians or installers.
All the boilers leave the factory already calibra-
ted 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 draw-
off 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.
B) MIN OUTPUT ADJUSTMENT
-
By pressing the “ –
DECREASE
“ key again the boiler will
operate at the minimum output (led
1
blinking).
MAXIMUM OUTPUT
ADJUSTMENT SCREW
1
The chimney sweeper mode remains active for
15 minutes.
To disenable the
chimney sweeper mode
befo-
re this time has elapsed, press the + (
INCREA-
SE
) and – (
DECREASE
) keys simultaneously (led
1 Off).
-
Check that the C0
2
values are within the values indicated
in the table “Burner pressures”
-
Press the + (
INCREASE
) and – (
DECREASE
) keys simul-
taneously for at least 3 seconds. The boiler will operate in
the CH mode at the maximum output (led 1 illuminated).
-
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.
BL
U
E
BL
U
E
BL
U
E
Summary of Contents for Alkon Cargo 35
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