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6.4
Burner ignition (light oil)
Position the selector 1)(Fig. 36) in "AUTO".
Position the selector 2) in "OIL" to select light oil fuel.
When the limit thermostat (TL) is closed, the "HEAT REQUEST"
3) signal must be switched on.
At first ignition, there is a momentary drop in fuel pressure due to
the filling of the nozzle piping.
1
S8384
6.5
Adjustments prior to ignition (gas)
In addition, the following adjustments must also be made:
Slowly open the manual valves situated upstream from the
gas train.
Adjust the minimum gas pressure switch (Fig. 40) to the start
of the scale.
Adjust the maximum gas pressure switch (Fig. 39) to the end
of the scale.
Adjust the air pressure switch (Fig. 38) to the start of the
scale.
Purge the air from the gas line.
We recommend using a plastic tube routed outside the build-
ing and to purge air until gas is smelt.
Fit a U-type pressure gauge or a differential pressure gauge
(Fig. 37), with socket (+) on the gas pressure of the pipe
coupling and (-) in the combustion chamber.
The manometer readings are used to calculate MAX burner
output.
Connect two lamps or testers to the two gas line solenoids to
check the exact moment in which voltage is supplied.
This operation is unnecessary if each of the two solenoid
valves is equipped with a pilot light that signals voltage pass-
ing through.
6.6
Burner start-up (gas)
Close the remote controls and position the selector 1)(Fig. 36) to
"AUTO".
Position the selector 2) to "GAS" to select gas as fuel.
Make sure that the lights or testers connected to the solenoids, or
the pilot lights on the solenoids themselves, indicate that no volt-
age is present.
Start-up, calibration and operation of the burner
2
This lowering of the fuel pressure can cause the burner to lockout
and can sometimes give rise to pulsations.
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.
4
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 deliv-
ery at the minimum.
CAUTION
20171813
If voltage is present, stop the burner immediately and check the
electrical connections.
When the limit thermostat (TL) closes, the "CALL FOR HEAT" 3)
signal must come on.
The burner will subsequently begin its starting cycle.
33
GB
3
Fig. 36
Fig. 37
20170641
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