PREXTHERM
13
2.02 Burner assembly (fig. 8)
The burner must be of the two-stage pressurized type and equipped with an intermediate flange for attaching
the door 4 to the burner plate 3. Due to the length of the combustion chambers it is recommended to use
nozzles with a spray angle of 30
°
to 45
°
to produce a long and narrow flame. It is also suggested to use the
shortest nozzles listed in the table below, so as to avoid a rapid inversion of the flame with the consequent
rise of flue gas temperature and reduced boiler efficiency.
NOTE - to prevent overheating the door near the burner plate, the gap between the burner shell and the hole
in the door should be filled with insulating material 2. The flexible pipes 8 should be long enough to allow
opening the door by 90
°
with the burner mounted.
* In gas burners, decrease the combustion chamber pressure by 15%
For ignition pressures, consider about 2.5 times the normal operation pressure.
Legend
1 Combustion chamber sight glass
2 Insulating rope
3 Burner plate
4 Front door
5 Burner
6 Turbulators
7 Boiler shell
8 flexible oil lines
Fig. 7
CHECK FOR CORRECT POSITION
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2
