Electrical Connections - Ecoflam Multicalor 300.1 PR/PR Manual

Gas/light-oil dual burners

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B LB1675 MULTICALOR 300.1-400.1 PR/PR

Once the burner has been connected to the gas supply, check that this last is perfectly sealed. Also verify that the chim-

ney is not clogged. Open the on-off valve and carefully bleed the piping through the pressure port, then check the pres-

sure value through a suitable pressure gauge. Turn on the system and adjust the thermostats to the needed temperature.

When the thermostats close, the leakage control device runs a valves leakage test, then enables the burner to start the

ignition cycle.

All burners are factory tested and set at 400 V 50 Hz three-phase for motors and 230 V 50 Hz monophase with neutral

for auxiliaries. If it is necessary to supply the burner at 230 V 50 Hz without neutral,make the necessary alterations

referring to the wiring diagram of the burner and check that the termal relay is within the absorption range of the

motor. Also check that the fan motor rotates in the correct direction.

OPERATION OF BURNER WITH GAS MULTICALOR 300.1-400.1

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. deli-

very 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 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 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.

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.

NOTE: ALL SAFETY DEVICES (AIR PRESSURE SWITCH, MINIMUM GAS PRESSURE SWITCH, GAS

SOLENOID VALVES AND GAS GOVERNOR) SHALL BE DULY SEALED AFTER CALIBRATION AND BUR-

NER START UP BY ECOFLAM'S TECHNICIANS.

Natural Gas

9,6%

<50 ppm

LPG

11,7%

<50 ppm

CONNECTION TO GAS PIPE