Riello GAS 6 P/M, Инструкции по установке, использованию и обслуживанию

Страница: 14 / 20

5244
12
4 - RATIO BETWEEN THE MINIMUM AND MAXIMUM OUTPUT
(References on drawings at page 9)
For a better explanation we suppose to have a burner with an adjustable output between the range 25 - 100. The
ratio between 1 : 4 (25 - 100) and 1 : 3 (25 - 75); our burners leave the factory set for these ratio.
If the ratio should be reduced at 1 : 2 (25 - 50 or 50 - 100) it is advisable to re-adjust the tension rods for the air and
gas and the controlling sector of the gas throttle valve.
4.1 - Control of the gas throttle valve
The tension rod 11) moving the control sector of the throttle valve is positioned - by the factory - on the hole marked
90° (90° is the moving angle of the throttle valve when the cam with the adjustable profile 6) covers the complete
angle of 130°).
When the ratio between the minimum and maximum output
is approximately 1 : 2, the tension rod shall be positioned
on the hole marked 60° (60° is the moving angle of the
throttle valve when the cam covers 130°).
If the ratio 1 : 2 is in the lower outputs range (25 - 50) the
change from 90° to 60° of the tension rod will be sufficient.
Should this ratio be in higher range (50 - 100) in this case,
further to position the tension rod on 60° it shall be
shotened.
Proceed as follows:
- Disjoint the articulation from the control sector.
- Screw down the tension rod on the extension.
- Re-assemble the articulation on the control sector.
In this way the gas throttle valve - servomotor at 0° - is
partially open.
The shortening of the tension rod shall permit the gas flow
without setting the 3rd cam of the servomotor too forward,
because in this way the turn of the cam with adjustable
profile would be limited.
4.2 - Control of the air damper
The length of the tension rod 13) adjusting the air damper
can be varied too.
If the air damper is moving, during the operation, into a
reduced angle (ratio 1 : 2 lower outputs range) it is
necessary to extend the tension rod.
In this way the cam profile is not too much bent.
When the burner is off proceed in this way:
- Disjoint the articulation 14) of the tension rod 13) from the
lever 15).
- Extend the tension rod.
- Manually position the servomotor on 0°.
- Join the tension rod to the lever.
- Move the cam profile till the pointer placed on the air
damper shaft is at 0°.