Electrical Connections; Burner Start-Up - Ecoflam Multicalor 500.1 PR/PR Manual Del Usuario

Quemadores mixtos gas + gasoleo

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B LB1661 MULTICALOR 500.1-600.1 PR/PR

All burner motors are tested at 400 V 3phase at 50 Hz, whilst auxiliaries are tested at 230V 1phase at 50 Hz.

Should it be necessary to power the burners at 230V/50Hz 3phase without neutral, carry out the necessary modifications accor-

ding to the burner's wiring diagram, and check that the thermal relay is within the absorption field of the motor.

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.

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 car-

ried 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.

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

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

BURNER START UP BY ECOFLAM'S TECHNICIANS.

Natural Gas

9,6%

<50 ppm

LPG

11,7%

<50 ppm