pag.18
B
LB972
MULTICALOR 300.1-400.1 PR/AB
ELECTRICAL CONNECTIONS
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.
CONNECTION TO GAS PIPE
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.
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.
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 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.
SUGGESTED REFERENCE VALUES
AIR EXCESS (%)
AIR FACTOR
THERMAL POWER (kW)
10
10
20
30
40 50 60
70
80
90
100
200
300 400
500
600
700
800
900
1000
1,1
1,15
1,2
1,2
1,2
1,25
1,3
15
20
25
30
2000
3000
5000
4000
6000
Natural Gas
CO
2
9,6%
CO
<50 ppm
LPG
CO
2
11,7%
CO
<50 ppm
0
1
2
0 - STOP
1 - GASOLIO
2 - GAS
LIGHT-OIL
