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All burners factory tested at 400 V 50 Hz three-phase for motors and 230 V 50 Hz monophase with neutral for auxi-
liary equipment. If mains supply is 230 V 50 Hz threephase withuot neutral, change position of connectors on burner
as in fig. Protect burner supply line with safety fuses and any other devices required by safety standards obtaining in the
country in question.
Once connected the burner to the gas pipeline, it is necessary to control that this last is perfectly sealed. Also verify that
the chimney is not obstructed. Open the gas cock and carefully bleed the piping through the pressure gauge connector,
then check the pressure value trough a suitable gauge. Power on the system and adjust the thermostats to the desired
temperature. When thermostats close, the sealing control device runs a seal test of valves; at the end of the test the bur-
ner will be enabled to run the start-up sequence.
Before starting the burner, make sure it is mounted correctly. Then check connections are correct according to the dia-
gram and piping is appropriate to the system. Before connecting the burner to the electricity supply, make sure voltage
corresponds to burner plate data. The connection diagram and start-up cycle are shown separately. For wiring from
control box to burner, see the enclosed connection diagram. Pay particular attention to neutral and phase connections :
never exchange them!. Vent air and impurities of gas pipe. Check gas pressure conforms to the
limits stated on the burner plate when connecting a master gauge to the test port provided on
the burner. Blower motor starts and pre-purging begins. Since pre-purging has to be carried out
with the max. air delivery, the burner control circuit turns the air damper to the max. delivery
position by the air servocontrol in approximately 30 seconds time. When the servocontrol is
fully open, a signal to the electronic control unit starts the 66 seconds (36 sec. LFL 1.333)
seconds pre-purge cycle. At the end of the prepurging time, the air servocontrol gets to the Low Flame position so that
burner ignition is ensured at min. output. Simultaneously the ignition transformer receives voltage and after 3 seconds
(pre-ignition) opens the pilot gas valve. Fuel flows to the combustion head and ignites. Two seconds after pilot gas val-
ves have opened, the ignition transformer is excluded from the circuit. In case of no ignition the burner goes to lock-
out within two seconds. After 6 sec. open the working gas valve, governed by the gas firing butterfly valve.Now the bur-
ner is operating at the min. firing rate (about 30% of the max. firing rate). The air servocontrol runs at the Low Flame
position and in case the temperature control has to be set at the max. output it goes to a fully open position of air dam-
per and butterfly valve. During the burner-off periods the air damper closes up fully.
IMPORTANT: to obtain the right adjustment of the combustion and thermal capacity it is important to analyze the
reducts of combustion with the aid of suitable instruments. The combustion and thermal capacity adjustment is done
simultaneously, together with the analysis of the products of combustion, making sure that the measured values are sui-
table and that they comply with current safety standards. On this matter, please refer to the table and figure below.
THESE OPERATIONS MUST BE DONE BY PROFESSIONALLY-QUALIFIED TECHNICIANS.
30
Natural G.
CO
9,6%
2
25
CO <100 ppm
20
GPL
15
CO
11,7%
2
10
CO
<50 ppm
ELECTRICAL CONNECTIONS
CONNECTION TO THE GAS PIPELINE
OPERATION OF BURNER WITH GAS
ADJUSTING THE COMBUSTION PROCESS
ADVISED VALUES OF REFERENCE
1,3
1,25
1,2
1,15
1,1
10
20
30
40 50 60
420010309500 Multiflam 300.1 - 400.1 PR/PR
1,2
80
100
200
300 400
70
90
500
THERMAL POWER (kW)
23
1
0 - STOP
HEAVY-OIL
1 - GASOLIO
2 - GAS
0
1,2
600
800
1000
2000
3000
4000
700
900
EN
2
5000
6000
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