Adjustments Prior To Ignition (Gas); Burner Start-Up (Gas); Burner Ignition - Riello DB 2 LSE FGR Installation, Use And Maintenance Instructions

5.5

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. 33 on
page 29) to the start of the scale.
 Adjust the maximum gas pressure switch (Fig. 32 on
page 29) to the end of the scale.
 Adjust the air pressure switch (Fig. 31 on page 29) 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
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.
5.6

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.
5.7

Burner ignition

The burner should light after having performed the above steps.
If the starting cycle has completed but the flame does not appear
and the control box goes into lockout, reset it and wait before try-
ing again.
If ignition is still not achieved, it may be that gas is not reaching
the combustion head within the safety time period of 3 seconds;
In this case increase gas ignition delivery.
The arrival of the gas at the pipe coupling is shown on the U-
shaped pressure gauge (Fig. 30) or else with the help of a digital
pressure gauge on the pressure test point under the pipe cou-
pling.
If further burner lockouts occur, refer to the "Reset procedure" in
the equipment manual supplied with the main panel.
Once the burner has fired, now proceed with global calibration
operations.
Start-up, calibration and operation of the burner
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
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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.
27 GB
Fig. 30
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