39
Instruction for the installer
3.19 - 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.
B) MIN OUTPUT ADJUSTMENT
Rotate the HEATING knob “B” in the zone between the sun
and the MIN temperature: the boiler operates at minimum
output (
symbol
wrench
= steady ON and
symbol radiator
= flashing).
Set the boiler in “
calibration
” mode by rotating the HEATING
knob “B” to its MAX setting and then press the RESET push
button for 3 s
(
symbol
wrench
= steady ON and
symbol radiator
=
steady ON).
-
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.
MAXIMUM OUTPUT
ADJUSTMENT SCREWS
MINIMUM 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
“B” in a CLOCKWISE direction to increase the value and in
an ANTICLOCKWISE direction in order to decrease it.
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.
MAX
M
IN
MAX
M
IN
°C
°C
Note:
Do not force the adjusting screws over the
limits (when noticing a different resistance).
Summary of Contents for ALKON R 18
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