pag.22
B
LB972
MULTICALOR 300.1-400.1 PR/AB
HYDRAULIC CIRCUIT
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 nozzle 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 clo-
sed; 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
+
-
VS
VR
VL
A
R
1
- Hose
2
- Oil filter
3
- Oil cock
A
- Suction
R - Return
VS - Safety oil valve
VL - Working oil valve
VR - Return oil valve
1
1
2
3
OPERATION OF BURNER WITH LIGHT-OIL FUEL MULTICALOR 300.1-400.1
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 2 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
