Burner Ignition (Light Oil); Adjustments Prior To Ignition (Gas); Burner Start-Up (Gas) - Riello DB 12 LSM C13 Installation, Use And Maintenance Instructions

6.6

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.
6.7

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. 35) to the start
of the scale.
➤ Adjust the maximum gas pressure switch (Fig. 34) to the end
of the scale.
➤ Adjust the air pressure switch (Fig. 33) 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. 30), with socket (+) on the gas pressure of the pipe
coupling and (-) in the combustion chamber. The manometer
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6.8

Burner start-up (gas)

Close the remote controls and set the selector on the main boiler
panel to " ON ".
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. If voltage is present, stop the burner immediately
and check the electrical connections.
When the limit thermostat (TL) closes, the " CALL FOR HEAT "
signal must come on (if present on the main panel) and the burn-
er will subsequently begin its starting cycle.
Start-up, calibration and operation of the burner
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.
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 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 deliv-
ery at the minimum.
CAUTION
29 GB
Fig. 30
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