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rect ratio. The same problem can be caused by
a wrong delivery air/gas in the combustion head.
This can be remedied by acting on the combustion head
regulation device by closing (pull back) or by opening
(move forward) the air passage between head and gas
diffuser. This can be done by acting on the regulation
screw of the flame disc.
5) W i t h b u r n e r o p e r a t i n g a d j u s t t h e d e l i v e
-
ry at the value corresponding to the desired capacity
(natural gas = 8550 kcal/m
3
) reading on the counter. This
capacity can be modified by acting on the relative regulator
included in the valve, as above exposed.
6) Check that combustion happens correctly, through the suita
-
ble instruments.
Maximum value admitted of carbonic axide (CO) = 0,1% with
carbon dioxide (CO
2
) value between 8 ÷ 10 %.
7) After having done the regulation it’s necessary to switch off
and on the burner times so as to verify that ignition occurs
correctly.
SAFETY CHECKS
After adjusting, always check the following:
1) Burner stop: open air and gas thermostats and pressure
switches.
2) “Blocking”: shadow the photocell (UV).To unblock, push the
appropriate button.
MAINTENANCE
At the end of the heating season, it is good practice to clean the gas
and light oil filters, the combustion head (disk, insulators, nozzles),
the combustion air passages and the photoelectric cell (UV).
It is advisable to use wooden or plastic instruments to clean the
nozzle passages.
Nozzle should be replaced after 12 months’ use.
UV CELL
If flame detection is carried out with the UV cell, the following should
be taken into consideration.
Even the slightest greasiness will compromise the passage of the
ultraviolet rays through the UV photoelectric cell bulb, thus preventing
the sensitive internal element from receiving the quantity of radiation
necessary for it to function properly.
Should the bulb be fouled by light oil, fuel oil, etc., it is indispensable
to clean it thoroughly.
It should be pointed out that even by simply touching the bulb with
the fingers, it is possible to leave a slight greasiness which could
compromise the working of the UV photoelectric cell.
The UV cell does not
“see” daylight or light from an ordinary lamp.
It is possible to verify its sensibility with a flame (or cigarette lighter
or a candle) or with the electric spark that occurs between electrodes
in an ordinary ignition transformer.
To ensure that the UV cell works properly, its current value should be
sufficiently stable so as not to fall below the minimum value required
for the specific control box.
It may be necessary to search experimentally for the best position
by sliding (axial or rotation movement) the body that contains the
photoelectric cell in respect to the fastening clamp.
An inspection can be carried out by inserting a microammeter, with
an adequate scale, in series to one of the two UV photoelectric cell
connection wires. It is obviously necessary to respect the polarity
(+ e -).
For control box the photocell coltage must be included between 200
microA and 500 microA.
N° 0002934080
N° 0002932102N1
DISK - ELECTRODES RELATIVE POSITION DIA-
GRAM
AIR REGULATION PRINCIPLE DIAGRAM AND
DISK-ELECTRODES SETTING
A = -Vite di fissaggio serranda aria
- Air gate fixing screw
B = - vite di regolazione disco testa (avvitare per aprire il passag
-
gio aria tra disco e testa, svitare per chiudere)
- head disk adjustment screw (tighten to open the head-disk
air passage, loosen to shut)
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