pag.23
LB 1377
MULTICALOR 170.1 -200.1 PR / MD
B
WORKING OF THE BURNER WITH LIGHT-OIL FUEL
Once having installed the burner, check the following items:
- The burner power feeding and the main line protection fuses
- The correct length of pipes and that the same are sealed.
- The type of fuel, which must be suitable for burner.
- The connection of boiler’s thermostats and all the safeties.
- The motor rotation direction.
- The correct calibration of the motor’s thermal protection.
When all the above mentioned conditions are checked and accomplished, it is possible to go on
with burner’s tests. Power the burner. The control box feeds the ignition transformer and the burner’s motor at the
same time, which will run a prepurging of the combustion chamber for about 20 sec.
At the end of prepurging, the control box opens solenoid valves and the burner starts. After a safety interval of 5
seconds and a correct ignition, the control box turns off the ignition transformer and, 10 seconds later, sets the motori-
sed air damper to its maximum opening (High flame). In case of faulty ignition, the control box switches the burner
into safety condition within 5 second. In such a case, the manual rearming of the burner shall not take place before 30
seconds have elapsed from the burner’s safety shutdown. In order to obtain an optimal combustion, it is necessary adju-
st the LOW - HIGH flame air flow, according to the instruction given further on. During such a phase, it will be possi-
ble to manually switch between HIGH and LOW flame and viceversa, through the High/Low flame switch. At the end
of the adjusting phase, leave the switch in position AUTO.
0
1
2
0 - STOP
1 - GASOLIO
2 - GAS
LIGHT-OIL
To calculate the length of the
pipework all the staight parts,
curves, up and down pipes
must be taken into considera-
tion. The static suction height
is the distance between the
standing valve and the axis of
the burner pump.
Pressure must not exceed 0,45
bar; if pressure is greather
pump operation may become
faulty, leading to an increase
in mechanical noise and
perhaps even breakage.
H
H
Bitubo dalla sommità del serbatoio
Bitubo in aspirazione
H
(m)
Lunghezza tubazioni (m)
0
0,5
1
2
3
3,5
ø 14 mm
ø 16 mm
16
18
20
25
29
31
29
33
37
44
52
55
J 7
H
(m)
0
0,5
1
2
3
3,5
ø 14 mm
ø 16 mm
16
14
12
7
3
1
29
26
22
14
7
4
J 7
Lunghezza tubazioni (m)
SUCTION LINE LENGTHS MAX. FOR TWO - PIPE SYSTEMS
Two-pipe siphon feed system
Two-pipe lift system
Copper pipe
Copper pipe
OIL DELIVERY ADJUSTMENT
The diagram illustrates the fuel feeding system of these types of burners, which incorporates a by-
pass nozzle with oil flow regulation on its return pipe. The oil supply is varied by acting on the nozz-
le through the pressure in the return line. Max. oil supply is therefore reached when the pressure in
the pump line is about 22 bar and the return line is fully closed; min. oil supply when the return
line is fully open. Relevant pressure readings in the return line are as follows:
Pump pressure 22-25 bar.
Max Burner output, return oil pressure:
FLUIDICS nozzle : 16 ÷19 bar.
BERGONZO nozzle : 20 ÷24 bar.
Min Burner output, return oil pressure:
FLUIDICS nozzle : 6 ÷9 bar
BERGONZO nozzle : 4 ÷8 bar
+
-
