Thermo Products Thermo Pride OH6FA072D48B, Installation And Operation Manual

Page: 46 / 79

43
The setting of the fan output according to the installation
should be done only through the air damper. Should you
want to adjust the setting of the combustion head, with the
burner running, turn the rod
(1)
with a 6mm wrench
(2)
as
follows:
TURN TO THE RIGHT: (SIGN + )
In order to increase the volume of air entering the
combustion chamber and thus diminishing its pressure.
There is a reduction of CO2
and the adhesion of
Figure 21
the flame to the air diffuser disc improves.
(Setting advisable for ignitions at low temperatures).
TURN TO THE LEFT: (SIGN - )
Figure 21
In order to reduce the volume of air entering the combustion chamber and thus increasing its pressure.
The CO2
improves and the adhesion of the flame to the diffuser tends to reduce. (This setting is not
advisable for ignitions at low temperatures).
In any case do not bring the combustion head setting more than one point away from that indicated in the
schedule. One set-point corresponds to 3 turns of the rod; a hole
(3)
at its end facilitates counting the
number of turns.
AIR DAMPER ADJUSTMENT:
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 output 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 (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.
The burner is provided with a hydraulic device controlled by the economizer which reduces the max.
output of oil and air by approximately 70%.