IOM / ROOF-TOP FLEXY™ Series - Page 27
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.
CAUTION :
Smoking is forbidden during any intervention on the gas
components.
Make sure that the gas supply line installation conforms to
the latest technology and the local safety regulations.
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.
Bleed the air in the gas delivery pipes by loosening the nuts
of the copper tubes on the gas solenoid valve inlet by two
turns. Tighten properly after bleeding.
Measure the pressure on the gas solenoid valve inlet (5 - figure
24), with the appliance at its rated value.
The rated value must be 20 mbar ± 2 for natural gas and 37
mbar ± 3 for propane.
If this is not the case, consult the gaz supplier or see the
following "Pressure reducing valve" section in the event of
the appliance being pwered by natural gas at 300 mbar.
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 not blocked.
Check that the supply air flow is correct.
IGNITION DETAILS
Make sure that the gas line valves are open.
With the ROOF TOP working (Setpoint 06 to ON), adjust
settings 59 and 60 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. When the depression in the fan is reached,
the pressostat (B21) tips.
After a pre-ventilation period (approx. 30 seconds) the gas
valve (YV51) opens and the firing sequence (ignition electrode
B6) is initiated.
Once the ionization probe detects the flame, the burners
functions normally.
If, when the ignition sequence is over, the ionization sensor
(B4) does not detect a flame, the burner disconnects and
CLIMATIC™ indicates the fault after a six-minute time delay.
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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