NATURAL GAS / LIGHT OIL DUAL FUEL BURNERS
25
CHECKS PRIOR LIGHT OIL FIRING
Make sure that the nozzle with sprouting angle at 60° is suitable to the boiler’s capacity.
In the list hereunder you find the delivery values in kg/h of light oil related to the nozzle’s size and to the pump’s
pressure (normally 12 bar). (Please note that 1 light oil kg corresponds to 10.200 kcal about).
Make sure that the protrusion of the combustion head inside the combustion chamber is according to boiler
manufacturer’s instructions.
Make sure that the return pipe in tank has no obstructions, such as gates closed caps etc.
Probable obstructions could cause faults on the pump’s shaft or flex pipe.
Open slightly the air purge device of the pump.
Disconnect the wire number 39 which feeds the pump motor from the terminal on the contactor “K1” and connect
it from moment the terminal “K1.56” of the “input junction box” so as to feed directly the pump motor.
Now close the reverser-switch on the burner and the general one and make sure that the rotation sense is correct.
Thus the pump motor is connected and starts the pump witch sucks the light oil.
When the light oil flow the air purge device open the main switch so as to stop the motor.
Be set original connections to the corresponding terminals.
The burner is thus ready to operate at light oil.
TABLE OF NOZZLE DELIVERY RATES IN Kg/h OF LIGHT OIL
Nozzle
G.P.H.
Pump pressure bar
8
9
10
11
12
13
14
0,60
2,04
2,16
2,28
2,39
2,50
2,60
2,70
0,65
2,21
2,34
2,47
2,59
2,71
2,82
2,92
0,75
2,55
2,70
2,85
2,99
3,12
3,25
3,37
0,85
2,89
3,06
3,23
3,39
3,54
3,68
3,82
1,00
3,40
3,61
3,80
3,99
4,16
4,33
4,50
1,10
3,74
3,97
4,18
4,38
4,58
4,77
4,95
1,20
4,08
4,33
4,56
4,78
5,00
5,20
5,40
1,25
4,25
4,50
4,75
5,00
5,20
5,40
5,60
1,35
4,59
4,87
5,13
5,38
5,62
5,85
6,07
1,50
5,10
5,41
5,70
5,90
6,24
6,50
6,75
1,65
5,61
5,95
6,27
6,58
6,87
7,15
7,42
1,75
5,95
6,31
6,65
6,98
7,29
7,58
7,87
2,00
6,80
7,21
7,60
7,97
8,33
8,67
8,99
2,25
7,65
8,15
8,55
8,97
9,37
9,75
10,12
2,50
8,50
9,01
9,50
9,97
10,41
10,83
11,24
STARTING UP AND REGULATION WITH LIGHT OIL
1) Check that the pump and fan motors rotate in the right direction.
2) Make sure that the discharge of combustion products can take place freely (chimney lock-gates should be
open) and that there is water in the boiler.
3) Open as much as considered necessary, the combustion air regulator, and open by about half the air passage
between the disk and the head by operating the regulating screw of the flame disk.
4) Close the main switch and the burner switch in order to connect the burner and wait for it to start up. The
burner is turned on in this way, and will carry out the pre-ventilation phase. If the air pressure exceeds the
value at which the air pressure switch has been set, the ignition transformer will be connected and
subsequently the light oil valve will be inserted. With the burner operating, correct if necessary, the combustion
air delivery.
5) The burner is fitted with a device which optimises the combustion by reducing or increasing the air passage
between the disk and the head. Maximum smoke intensity permissible is N° 2 of the Bacharach scale with a
Carbon Dioxide (CO
2
) value between 10 and 13 %. It is normally necessary to reduce the air passage between
the disk and the head when operating with a reduced fuel delivery.
Summary of Contents for Minicomist 7
Page 17: ...BRUCIATORI MISTI DI GAS GASOLIO 17...
Page 18: ...BRUCIATORI MISTI DI GAS GASOLIO 18 18...
Page 30: ...30 NATURAL GAS LIGHT OIL DUAL FUEL BURNERS...
Page 31: ...NATURAL GAS LIGHT OIL DUAL FUEL BURNERS 31...
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