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6.4
Adjustments prior to ignition (gas)
In addition, the following adjustments must also be made:
Slowly open the manual valves situated upstream of the gas
train.
Adjust the minimum gas pressure switch (Fig. 41) to the start
of the scale.
Adjust the maximum gas pressure switch (Fig. 40) to the end
of the scale.
Adjust the air pressure switch (Fig. 39) to the start of the
scale.
Purge the air from the gas line.
We recommend using a plastic 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. 34), with socket (+) on the gas pressure of the pipe
coupling and (-) in the combustion chamber.
Used to approximately calculate the MAX burner output.
Connect two lamps or testers to the two gas line solenoid
valves to check the exact moment in which voltage is
supplied.
This operation is not required if each of the two solenoid
valves is equipped with a pilot light that signals voltage
passing through.
6.5
Burner start-up (gas)
Close the remote controls and set the switch 1) (Fig. 33) to
"AUTO".
Position the selector 2) on "GAS" to select gas as fuel.
Check that the lamps or testers connected to the solenoid valves,
or the pilot lights on the solenoid valves, indicate that no voltage
6.6
Burner ignition
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 does not occur, it is possible that gas is not reaching the
combustion head within the safety time period of 3 seconds.
Therefore, it is necessary to increase gas ignition delivery.
The arrival of gas to the sleeve is indicated by the U-type
pressure gauge (Fig. 34).
If the burner locks out again, refer to chapter "Problems - Causes
- Remedies signalled by LED indicators" a pag. 43.
6.7
Change of fuel
There are two change of fuel options:
1
with selector 2)(Fig. 33);
2
with a remote selector connected to the main terminal
board. Positioning the selector 2)(Fig. 33) to "EXT" activates
the remote selection of the fuel.
20148180
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
delivery at the minimum.
CAUTION
20062798
is present. If they indicate the presence of voltage, stop the
burner immediately and check the electric connections.
When the limit thermostat (TL) is closed, the heat request
indication "CALL FOR HEAT" 3)(Fig. 33) must be displayed and
the burner starts 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.
Once ignition has taken place, proceed with burner global
calibration operations.
30
GB
Fig. 34
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