Probe-Electrode Position; Adjustments Prior To Ignition - Riello DB 4 SE FGR Installation, Use And Maintenance Instructions

5.3

Probe-electrode position

Check that the pilot diffuser and the electrode are
placed as in Fig. 23, according to the dimensions
indicated.
WARNING
DB 3 SE FGR
DB 4-6 SE FGR
5.4

Adjustments prior to ignition

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. 27) to the start
of the scale;
 adjust the maximum gas pressure switch (Fig. 26) to the end
of the scale;
 adjust the air pressure switch (Fig. 25) to the start of the
scale;
 purge the air from the gas line. We recommend using a plas-
tic 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. 24), 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 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
Start-up, calibration and operation of the burner
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1 1 ± 1 m m
3 6 m m
± 1
Electrode
Pilot Diffuser
25 GB
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Fig. 23
Fig. 24
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