Riello RLS 310/M MX, Регулируемая работа, Страница: 35 / 76

33 20084880 GB
Start-up, calibration and operation of the burner
6.8 Adjustments prior to ignition (gas)
Combustion head adjustment is already described on page 21.
In addition, the following adjustments must also be made:

Open manual valves upstream from the gas train.

Adjust the minimum gas pressure switch to the start of the
scale.

Adjust the maximum gas pressure switch to the end of the
scale.

If necessary, adjust the air pressure switch (previously
adjusted when operating with light oil).

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. 33), 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 using the Tab. M.

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 solenoids is
equipped with a pilot light that signals voltage passing through.
6.9 Burner ignition (gas)
Electrically power the burner using the disconnecting switch
on the boiler panel.
Put the selector Fig. 6) on “
GAS ” to select gas as the fuel.
The burner should light after having performed the above steps.
If the motor starts up, but the flame does not appear and the con-
trol box goes into lockout, reset it and wait for a new ignition at-
tempt.
Two types of burner failure may occur:

Control box lockout : when the control box button comes on
(light signal) 2)(Fig. 6 on page 15) it warns you that the
burner is in lockout. See “Faults - Possible causes - Solu-
tions” on page 44 for the causes of the lockout. release by
pressing the push-button 2)(Fig. 6 on page 15). See control
box reset.

Motor lockout because of thermal relay intervention :
because of an erroneous calibration of the thermal relay or
problems with the motor or the main power supply. Release
by pressing the button on thermal relay, see section 4.15 on
page 17.
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 gas at the pipe coupling is indicated by the U-type
pressure gauge (Fig. 33).
Once the burner has fired, now proceed with global calibration
operations.
CAUTION
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.
20085591
Fig. 33