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Idiomas disponibles
Idiomas disponibles
B LB1661 MULTICALOR 500.1-600.1 PR/PR
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.
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
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
VERIFY:
- That piping system is perfectly sealed;
- That the use of hoses is avoided whenever is possible (use copper pipes preferably);
- That depression is not greater than 0,45 bar, to avoid pump's cavitation;
- That check valve is suitably designed for the duty;
The pump pressure is set at a value of 22-24 bar during the testing of burners. Before starting the burner, bleed the air
in the pump through the gauge port. Fill the piping with light-oil to facilitate the pump priming. Start the burner and
check the pump feeding pressure. In case the pump priming does not take place during the first prepurging, with a con-
sequent, subsequent lock-out of the burner, rearm the burner's lock-out to restart, by pushing the button on the control
OIL DELIVERY ADJUSTMENT
HYDRAULIC CIRCUIT
A
R
VR
3
PRIMING AND ADJUSTMENT OF OIL PUMP
VS
pag.16
VL
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