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desired type of gas, complying with what
indicated in Table 4.
• The nozzle diameter is indicated in hundredths of
mm on the nozzle body.
• Tighten screw "A" firmly.
6.4.2 - Replacing the nozzle of pilot burner (Fig. 6)
• Remove the front panel.
• Unscrew the screw "4" of gas pipe.
• Remove nozzle "5" and replace it with the
suitable one.
• The number identifying the nozzle is indicated on
the body of the same nozzle.
• Tighten screw "4" firmly.
6.4.3 - Replacing the nozzle of ignition burner
(Fig. 10)
• Remove the front panel.
• Unscrew the screw "1" of gas pipe and shift it
together with sealing olive "2".
• Unscrew nut "3" and move the ignition burner
forward.
• Remove nozzle "4" and replace it with the
suitable one.
The nozzle diameter is indicated in hundredths of
mm on the nozzle body.
• Reassemble the whole unit according to the
opposite sequence of disassembling operations.
Take care to position the air vent "5" downwards
again.
6.4.4 - Replacing the nozzle of minimum flow
bypass valve (Fig. 5)
• Remove the control board unscrewing the fastening
screws and leave it hanging on its supports.
• Unscrew the minimum flow nozzle "1" from the gas
valve and replace with that suitable for the chosen
type of gas screwing it tightly.
• The nozzle diameter is indicated in hundredths of
mm on the nozzle body.
Note: after replacing the parts of gas pipe, make
always sure of the perfect tightness of the same
pipe with a foaming spray.
Carry out checks and adjustments according to
steps 6.1 – 6.2 – 6.3.
7 - CHECKING THE OPERATION
• Set the equipment at work according to the
operating instructions.
• Make sure of the tightness of gas system.
• Check the flame ignition and stability, either at the
maximum flow rate and at the minimum flow rate.
• Check the effectiveness of fume exhaust system.
• Check the operation of the safety valve.
• Check the balance of the lid.
• Train the user on the operation and maintenance of
the
equipment
referring
handbook, informing particularly of all the warnings
having to be complied with for a correct use.
to
the
operational
8 - MAINTENANCE
All the components having to be serviced are
accessible from the front side of the equipment
after the removal of the control board or of the front
panel.
8.1 - MALFUNCTIONING AND
TROUBLESHOOTING
The pilot burner does not light up
Possible causes:
• The sparker plug is not fixed firmly or it has not
been connected correctly.
• The piezoelectric lighter or the plug cable are
damaged.
• Pressure in gas pipes insufficient.
• The nozzle is clogged.
• The gas valve is faulty.
The pilot burner went out after the ignition knob is
released
Possible causes:
• The thermocouple is not sufficiently heated by the
pilot burner.
• The thermocouple is faulty.
• The gas knob is not pressed sufficiently.
• There is no gas pressure at the valve.
• The gas valve is faulty.
• The safety thermostat is faulty and it has tripped.
• An
electric
disconnected.
The pilot burner is kept on, but the main burner
does not light up
Possible causes:
• Pressure drop in the gas pipe.
• Clogged nozzle or faulty gas valve.
• Burner with gas outlet holes clogged.
• Fault of gas solenoid valve or of its electric controls.
Tripping of safety thermostat
• The equipment is provided with a safety thermostat
that cuts off the gas supply to the main burner in
case of anomalous operation or dry operation.
• After eliminating the tripping cause, remove the
protection cap "L" from the control board and press
the underlying red button to restart the operation.
• This operation must be carried out by a skilled
engineer.
WARNING: tampering with the thermostat will
invalidate the warranty.
8.2 - REPLACING COMPONENTS
Caution! Any part of the equipment must be
replaced by authorized personnel using original
spare parts.
Piezoelectric lighter and cable
• Remove the knobs, control board and front panel.
• Replace the component and fasten the cable again
with suitable hose clamps.
• Reassemble the components and the panels
according to the opposite sequence.
21
DOC. NO. 5958 9AY00
Edition 1
-
cable
of
the
thermostat
01.2013
is
Capítulos
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