pag.19
LB 1377
MULTICALOR 170.1 -200.1 PR / MD
B
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 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 bur-
ner will be enabled to run the start-up sequence.
OPERATION OF BURNER WITH GAS
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 bur-
ner 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 gas valve. Fuel flows to the combustion head and ignites, being governed by the gas firing butterfly
valve. Two seconds after 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. 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 dumper 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 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 BURNER START
UP BY ECOFLAM’S TECHNICIANS.
ECCESSO D'ARIA (%)
FATTORE D'ARIA
10
10
20
30
40 50 60
70
80
90
100
200
300 400
500
600
700
800
900
1000
2000
1,1
1,15
1,2
1,2
1,2
1,25
1,3
15
20
25
30
O
O
(
)
SUGGESTED REFERENCE VALUES
Natural Gas
CO
2
9,6%
CO
<100 ppm
EXCESS AIR (%)
AIR FACTOR
RATED USEFUL CAPACITY (KW)
