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ADJUSTING AIR AND FUEL RATE
ATTENTION: before starting the burner up, be sure that the manual cutoff valves are open. Be sure that the mains
switch is closed.
.ATTENTION: During commissioning operations, do not let the burner operate with insufficient air flow (danger of
formation of carbon monoxide); if this should happen, make the fuel decrease slowly until the normal combustion
values are achieved.
Before starting up the burner, make sure that the return pipe to the tank is not obstructed. Any obstruction would
cause the pump seal to break.
IMPORTANT! the combustion air excess must be adjusted according to the values in the following chart.
Fuel
Heavy oil
The heavy oil flow rate can be adjusted choosing a nozzle that suits the boiler/utilisation output and setting properly the delivery pres-
sure values.
The table below shows indicative values of temperature and pressure to be set on the burner devices, according to the viscosity of the
heavy oil used. The oil temperature should be set on TR resistor thermostat in order to get about 1.5°E viscosity at the nozzle.
ATTENTION: Atomizing air pressure is tipically set at 0.1 ÷ 0.3 bar lower than oil pressure (xBY1025/1030).
Atomizing air pressure is tipically set at 0.5 ÷ 1 bar lower than oil pressure (xBY1040).
C.I.B. UNIGAS - M039126CE
Recommended combustion parameters
OIL PRESSURE
VISCOSITY
BURNER PUMP
AT 50 °C
(N. 2 in 3I2-D02/03)
min
°E
< 50 (7)
5
> 50 (7)
< 110 (15)
5
> 110 (15) < 400 (50)
5
> 400 (50) <4000 (530)
5
Tab. 3 - Burner - hydraulic scheme 3I2-D02/03, pump n.2
Recommended (%) CO
11 ÷ 12.5
OIL PRESSURE AFTER OIL
AFTER
METERING VALVE
(N. 17 IN 3I2-D02/03)
max
min
bar
8
0.5
2 (xBY1025/1030) / 4 (xBY1040)
8
0.5
2 (xBY1025/1030) / 4 (xBY1040)
8
0.5
2 (xBY1025/1030) / 4 (xBY1040)
8
0.5
2 (xBY1025/1030) / 4 (xBY1040)
24
Recommended (%) O
2
4.7 ÷ 6.7
max
bar
2
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