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6.4
Adjustments prior to ignition (gas)
Combustion head adjustment has already been already de-
scribed in the section "Combustion head adjustment" on page 24.
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).
Adjust the pressure switch for the leak detection control
(PVP kit) (Fig. 37 on page 38) according to the instructions
supplied with the kit.
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. O on page 31.
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.
6.5
Burner start-up (gas)
Close the remote controls and position the selector (Fig. 32 on
page 34) on "ON".
Put the selector (Fig. 32 on page 34) on "GAS" to select gas as
the fuel.
6.6
Burner ignition
The burner should light after having performed the above steps.
If the motor starts but the flame does not appear and the control
box goes into lockout, reset and wait for a new ignition attempt.
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 sleeve is indicated by the U-type manom-
eter (Fig. 33).
If the burner locks out again, see the chapter see "Faults - Possi-
ble causes - Solutions" on page 46.
6.7
Change of fuel
There are two change of fuel options:
1
with selector (Fig. 32 on page 34);
2
with a remote selector connected to the main terminal
board.
Positioning the selector (Fig. 32 on page 34) to "EXT" acti-
vates the remote selection of the fuel. In this position, if
there is no remote selector, the display shows the priority
fuel.
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
20095479
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 burner begins the
starting cycle.
In the event the burner stops, in order to prevent
any damage to the installation, do not unblock the
burner more than twice in a row. If the burner
locks out for a third time, contact the customer
WARNING
service.
In the event there are further lockouts or faults
with the burner, the maintenance interventions
must only be carried out by qualified, authorised
personnel, in accordance with the contents of this
DANGER
manual and in compliance with the standards and
regulations of current laws.
35
GB
Fig. 33
20182250
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