pag.3
LB1374
MULTIFLAM 700.1÷1200.1 PR
techniques for energy saving
CONNECTION TO THE GAS PIPELINE
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 burner will be enabled to run the start-up sequence.
ELECTRICAL CONNECTIONS
All burners factory tested at 400 V 50 Hz three-phase for motors and 230 V 50 Hz monophase with neutral for
auxiliary 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 obtai-
ning in the country in question.
BURNER START-UP
Before starting the burner, make sure it is mounted correctly. Then check connections are correct according to the
diagram 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 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 valves have opened, the ignition transformer is excluded from the circuit. In case of no igni-
tion 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 burner 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 damper and butterfly valve. During the burner-off periods the air damper closes
up fully.
0
1
2
0 - STOP
1 - GASOLIO
2 - GAS
LIGHT-OIL
ADJUSTING THE COMBUSTION PROCESS
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 suitable 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.
NOTE:
ALL SAFETY DEVICES (AIR PRESSURE SWITCH, MINIMUM GAS PRESSURE SWITCH, GAS SOLE-
NOID VALVES AND GAS GOVERNOR) SHALL BE DULY SEALED AFTER CALIBRATION AND BUR-
NER START UP BY ECOFLAM’S TECHNICIANS.
