CONTROLS
After starting the burner, check the safety devices, photoresistor, lock
components, thermostats.
•
The flame control device must be able to trigger during burner
operation if no flame is present.
•
The burner must shut down in lock position and remain in that
condition when, upon ignition and during the time preset by the
command equipment, the flame is not ignited. The lock-out causes
the immediate stop of the motor and burner and the switching on of
the corresponding lock-out light indication. To check the efficiency of
the flame detector and lock-out system, proceed as follows:
•
Start the burner.
•
After ignition, remove the photoresistor, pulling it out of its housing,
to simulate absence of flame by darkening the photoresistor blocking
off the window in the photoresistor support with a cloth
•
The burner flame must go out.
•
By keeping the flame sensor engaged, the burner attempts to start.
However, when the flame is not detected, the equipment sets the
burner to lockout condition.
•
The equipment can only be reset manually by pressing the specific
button.
THERMOSTATS
•
To check the thermostats’ efficiency, increase the boiler water
temperature up to at least 50° C.
•
Act on the thermostat control knob to lower the temperature until the
burner stops.
•
The thermostat should activate within a maximum range of 10° C
with respect to the boiler thermometer; if not, change the setting on
the thermostat scale to match that of the thermometer.
AIR REGULATION ON THE COMBUSTION HEAD
The combustion head is equipped with a regulation device that makes
it possible to open or close the air passage between the disk and the
head.
Closing the air passage increases the pressure upstream of the disk
also with low flow rates.
The high speed and turbulence of the air provides for its greater
penetration into the fuel and therefore an excellent mixture and flame
stability.
It may be necessary to have high air pressure upstream of the disc, so
as to prevent flame pulses. This condition is indispensable when the
burner operates on pressurised combustion chamber and/or with high
heating load.
Therefore the air regulation device on the combustion head must be
set to such position as to always obtain, behind the disc, a very high
pressure value.
To do this fasten the device in an intermediate position on the head air
closure, and act on the air damper by increasing the fan intake flow;
needless to say that this condition must occur when the burner is
working at the maximum capacity required by the system.
Correct the position of the device that closes the air of the combustion
head, moving it forward or backward, in order to obtain an air flow
suitable for the supply with the air damper considerably open.
16
15
11
10
0002935410
X = Head-disk distance; adjust distance X following the instructions:
•
loosen the screws (10),
•
turn screw (11) to position the combustion head (16) referring to
index (15).
•
adjust the distance X between the minimum and maximum value,
according to what is indicated in the table.
DANGER / ATTENTION
The adjustments are indicative only; position the combustion
head according to the characteristics of the combustion chamber.
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