3209
6
AIR DAMPER ADJUSTMENT
The regulation of the air-rate is made by adjusting the air
damper (1), after loosing the screws (2).
The settings indicated in the schedule refer to the burner
with its metal cover fitted and the combustion chamber with
“zero” depression.
These regulations are purely indicative. Each installation how-
ever, has its own unpredictable working conditions: actual
nozzle output; positive or negative pressure in the combus-
tion-chamber, the need of excess air, etc.
All these conditions may require a different air-damper set-
ting.
It is important to take account of the fact that the air
output of the fan differs according to whether the burn-
er has its metal cover fitted or not.
Therefore we recommended to proceed as follows:
– adjust the air damper as indicated in the schedule (3);
– mount the cover, simply by means of the upper screw;
– check smoke number;
– should it become necessary to modify the air output, remove the cover by loosening the screw,
adjust the air damper, remount the cover and finally recheck the smoke number.
ELECTRODE SETTING
BURNER START-UP CYCLE
2
1
2
D5675
3
Attention:
Before assembling or removing the
nozzle, loose n the screw
(A)
an d
move the electrodes ahead.
2 – 2.5
mm
4
±
0.3 mm
IMPORTANT:
THESE DIMENSIONS
MUST BE OBSERVED
D5230
A
Normal
Lock-out, due to light-failure
Thermostat
Motor
Ignition transformer
Valve
Flame
Lock-out lamp
~
12s
D5229
~
12s
~
5s
