IOM / ROOF-TOP FLEXY™ Series - Page 23
GAS BURNERGAS BURNER
GAS BURNERGAS BURNER
GAS BURNER
PRELIMINARY CHECKS ON
COMMISSIONING
NOTE: Any work on the gas system must only be
carried out by qualified personnel.
Check that the gas supply line can provide the burners
with the pressure and the gas flow rate necessary to
provide the heating output duty.
Measure the pressure on the gas solenoid valve inlet.
The rated value must be 20 mbar for natural gas and
37 mbar for propane.
If this is not the case, see the following "Pressure
reducing valve" section.
Make sure that the gas supply line installation conforms
to the latest technology and the local safety regulations.
Check that the supply air flow is correct.
Check that the supply voltage of the ignition control
box(es) is between 220 and 240V.
Check that the air inlet combustion vents and the smoke
extract vents are fitted and not blocked. The cap and
the deflector must be installed to keep the lines dry.
IGNITION DETAILS
Make sure that the gas line valves are open.
With the ROOF TOP working (06 to ON), adjust settings
56 and 57 to ON to start the priority. Increase setting 1
(threshold temperature) to a temperature greater than
the ambient temperature (Var. 1) This in turn produces
a heating demand and starts the burner.
The control box supply switch (KM21) closes and the
burner fan (VIN1) starts.
After a few seconds the pressure controller of the fume
extractor (B21) trips.
After a pre-ventilation period the gas valve (YV51)
opens and the firing sequence (ignition electrode B6)
is initiated.
If, when the ignition sequence is over, the ionization
sensor (B4) does not detect a flame, the burner
disconnects and CLIMATIC indicates the fault.
However, as soon as the ionization sensor detects a
flame, the ignition electrode is switched off.
If the flame goes out during normal operating, the
control restarts the firing sequence with pre-ventilation
until a flame has been detected or there is
disconnection.
When a burner has two gas tiers, the procedure for
the second tier is similar but the references are as
follows :
- KM22 for the supply switch
- VIN2 for the fan
- B22 for the gas exhaust pressure switch
- YV52 for the gas valve
- B7 for the ignition electrode and
- B5 for the ionization sensor.
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