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B LB 1371 Multicalor 45 ÷ 140
OPERATION OF BURNER WITH LIGHT-OIL FUEL
Gas/Light-oil dual burners must always be adjusted for a first light-oil ignition. After having installed the burner, check
the following points: Feeding voltage and protection fuses - Motor connections – The correctness of pipe system length
and its sealing – The type of fuel, which must be suitable for the burner - The connections of boiler’s thermostats and
the safety devices – The direction of motors rotation – The correct calibration of motors protections – The nozzles flow
rate must be suitable for the boiler’s output – At the end, fit a manometer on the pump itself. When all the above con-
ditions are met, it will, then, be possible to proceed with the burner start-up. Switch the burner ON. The control box
will power up the fuel pump and the fan’s motor, thus allowing a prepurging of the combustion chamber at the maxi-
mum air flow rate. At the end of prepurging, the servomotor will set up to the light-oil Low flame position, whilst the
control box powers up the ignition transformer and the “Safety” and “Low flame” solenoid val-
ves.If the burner ignites normally, after a safety time of 3 sec. the control box will power off the
ignition transformer and after 10 secs. operates the air damper’s servomotor, bringing the bur-
ners to High flame operation. In case of faulty ignition, the control box will shut down the
burner to lockout position within 3 sec. In this case, the burner must be reset manually, by
pressing the lockout enable pushbutton on the control box itself. In order to obtain a correct
combustion, it will be necessary to adjust the Low and High flame by following the instructions showed at pages 8÷9
(Air servomotor and firing head adjustment). During the adjusting phase, it will be possible to manually switch, back
and forth, from Low flame to High flame through the High-Low flame manual switch. When all the adjusting opera-
tions are achieved, leave the switch in High flame position. For a correct reading and calibration, carry out the combu-
stion analysis in the chimney.
LIGHT-OIL
ADJUSTING THE MAXIMUM CAPACITY OF THE BURNER
Position the selector, situated on the control panel, on position maximum power and proceed as follows:
Adjusting the maximum gas flow rate: - proceed as stated in the regulating the solenoid valves until you achieve the
correct gas flow, as established by analyzing the combustion process. Eventually adjust the gas flow rate using a suitable
allen wrench, alter the position of the cam(3) guide blade; if you screw it down, the flow rate is reduced; if you unscrew
it, the flow rate increases.
Adjusting the maximum air flow rate: Eventually adjust this position acting on the screw “1 “, after loosening nut “ 2
“.
Tighten the nut “2” in place once again.
ADJUSTING THE MINIMUM CAPACITY OF THE BURNER
Position the selector, situated on the control panel, on position minimum power and proceed as follows:
Adjusting the minimum gas flow rate: using a suitable Allen wrench, alter the position of the cam(3) guide blade; if
you screw it down, the flow rate is reduced; if you unscrew it, the flow rate increases.
Adjusting the minimum air flow rate: adjust on limit switch for air damper “Low Flame” position adjustment.
ADJUSTING THE INTERMEDIATE BURNER CAPACITIES
Using the selector, start the servomotor (closing or opening) and position on 0 to stop the stroke; the adjustment is
made as outlined below. Repeat the operation for the other cam points.
Adjusting the intermediate gas flow rates: using a suitable Allen wrench, alter the position of the cam(3) guide blade; if
you screw it down, the flow rate is reduced; if you unscrew it, the flow rate increases.
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