21
10090943EN
7.5. Adjusting the Air Velocity in the Combustion Head J50, LJ50
Adjust the air velocity in the combustion head by turning the setting screw (5), to change the
distance between the adjustment ring and the edge of the diffuser disc (4). There is a scale with
four grooves in the combustion head, which is directed to the back edge of the adjustment ring
according to the capacity. At low capacity the adjustment ring is advanced and at high capacity
retracted. If the adjustment ring is too far forward with respect to the capacity, the air velocity in
the combustion head is too high. Hence it follows, that the ignition is more difficult and/or there
is not enough air to support combustion at full load. If the adjustment ring is too far back, the air
velocity in the combustion head is too low. Hence it follows, that the combustion values become
worse. Check burner combustion characteristics by means of flue gas analysis.
1
Mounting
flange
2
Flame
tube
3
Adjustment
ring
4
Diffuser
disc
5
Setting
screw
Normative positions of the adjustment ring, when the nozzle pressure is 10 bar (factory setting).
Capacity
Position of
Nozzle Usgal/h
kg/h adjustment
ring LJ50
J50
2,5 - 3,0
1
0,75 - 1,00
0,65 / 0,75
4,0 2 1,25 1,00
5,0 3 1,50 1,25
6,0 / 6,5
4
1,75 / 2,00
1,50 / 1,75
Note!
If the position of the adjustment ring has to be altered in relation to the diffuser disc,
the air velocity and quantity in the combustion head will change. Check the
combustion values by flue gas analysis and, if necessary, adjust the combustion air
quantity to be adequate.