Bartscher 285.620 Mode D'emploi page 40

Checking regulation of primary air
All the main burners are provided with primary air regulation. Checking must be done observing the
values shown in the air regulation column of the burner features tables (pag.33,34). To regulate the
primary air, proceed as illustrated in the following paragraphs.
ATTENTION! All the parts, protected and sealed by manufacturer may not be regulated by
the installer if not specifically indicated.
REGULATIONS AND SUBSTITUTION FOR USING A
DIFFERENT GAS THAN THE TYPE PROVIDED FOR
Functioning with different gas than the type provided for.
For changing to another type of gas it is necessary to substitute the nozzle in the main burners and
in the pilot burner, following the indications given in the following paragraphs. The type of nozzle
to install can be found in tables 2-3-4-5-6 (pag.33, 34). The nozzles for the main burner, marked
with the relative diameter in hundredths, and the ones for the pilot burner, marked with a number,
can be found in a transparent packet attached to the instruction booklet. When the conversion is
completed, check the tightness of the pipe fittings and also that the ignition and functioning of both
pilot burner and main burner, at both minimum and maximum, are correct. It may be necessary to
check the output (power).
Substituting the burner nozzle (fig. 11, 12 – pag. 5)
To substitute the nozzle of the burner, it is necessary to remove the handles of the container of the
lava stone , unscrewing with a setscrew wrench the socket head screws that fix it (for the models
where it is foreseen).. It is necessary to remove the knob (1), the box (2), and the control panel (3).
After having cleared the work area, loosen the screw (4) which blocks the regulation of primary air
(7), with a screwdriver and open it completely. Unscrew the nozzle (6) from the nozzle holder (5)
with a spanner and substitute it with the nozzle suitable for the type of gas to be used, shown in
tables 2-3-4-5-6 (pag.33, 34).After assembling the new nozzle tightening it well, proceed with
regulating the primary air as indicated in the next paragraph. Finally, put back the panel and the
knob.
Regulating the primary air of the burner (fig. 12 – pag.5 )
After having substituted the burner nozzle, it is necessary to proceed by regulating the primary air:
loosen the screw (1), bring value "x" to the correct measurement, referring to tables 2-3-4-5-6
(pag.33, 34), tighten the screw (1) and check the accuracy of value "x".
Regulation of by-pass (fig. 13 – pag.5)
For functioning with liquid gas, the by-pass (1) must be fully screwed and properly tightened.
While for functioning with methane gas the by pass (1) must be regulated in the following way:
read the value of the minimum output in tables 2-3-4-5-6 (pag.33, 34)and convert it into l/h by
using the "Volumetric method" described previously; at this stage the appliance can be started up,
following the instructions. When this has been done, it is necessary to regulate the by-pass capacity
by reading the meter, turning it clockwise to reduce the flow and anti-clockwise to increase it. After
regulating, fix the position of the by-pass with a drop of red paint, suitable for this use
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