2809
7
4.5 AIR DAMPER ADJUSTMENT, (see fig. 11)
The mobile air damper (1) operated by the jack (2) assures the
complete opening of the air intake.
The regulation of the air-rate is made by adjusting the fixed air
damper (3), after loosing the screws (4). When the optimal
regulation is reached, screw tight the screws (4) to assure a
free movement of the mobile air damper (1).
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 however, has its own unpredictable working
conditions: actual nozzle output; positive or negative pressure
in the combustion chamber, the need of excess air, etc.
All these conditions may require a different air damper setting.
It is important to take account of the fact that the air out-
put of the fan differs according to whether the burner has
its metal cover fitted or not.
Therefore we recommended to proceed as follows:
– adjust the air damper as indicated in the schedule;
– 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.
4.6 BURNER START-UP CYCLE
Normal
Thermostat
Motor
Ignition transformer
Valve
Flame
Lock-out lamp
~ 12s
D5229
~ 12s
~ 5s
Lock-out due to failure to light
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