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5.4
Burner ignition (light oil)
Set the selector on the main panel to "ON".
Set the fuel selector to "OIL" to select light oil as fuel.
When the limit thermostat (TL) is closed, the heat request signal
must be switched on.
At first ignition, there is a momentary drop in fuel pressure due to
the filling of the nozzle piping. This lowering of the fuel pressure
can cause the burner to lockout and can sometimes give rise to
pulsations.
5.5
Adjustments prior to ignition (gas)
In addition, the following adjustments must also be made:
slowly open the manual valves situated upstream of the gas
train;
adjust the minimum gas pressure switch (Fig. 34 on
page 30) to the start of the scale;
adjust the maximum gas pressure switch (Fig. 33 on
page 30) to the end of the scale;
adjust the air pressure switch (Fig. 32 on page 30) to the
start of the scale;
purge the air from the gas line.
We recommend using a plastic tube routed outside the
building and to purge air until gas is smelt.
Fit a U-type pressure gauge or a differential pressure gauge
(Fig. 30), with socket (+) on the gas pressure of the pipe
coupling and (-) in the combustion chamber. Used to
approximately calculate the MAX burner output.
Start-up, calibration and operation of the burner
Once the following adjustments have been made, the ignition of
the burner must generate a noise similar to the noise generated
during operation.
If a burner lockout occurs, refer to the "Release procedure" given
in the equipment manual supplied.
Connect two lamps or testers to the two gas line solenoid
valves to check the exact moment in which voltage is
supplied.
This operation is not required if each of the two solenoid
valves is equipped with a pilot light that signals voltage
passing through.
Before starting up the burner, it is good practice to
adjust the gas train so that ignition takes place in
conditions of maximum safety, i.e. with gas
delivery at the minimum.
CAUTION
27
GB
20175334
Fig. 30
20174375
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