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5244

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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°.

Содержание GAS 6 P/M

Страница 1: ...2915244 3 09 2012 Installation use and maintenance instructions Forced draught gas burner MODEL TYPE GAS 6 P M 536 T80...

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Страница 3: ...asured at the cou pling with nil pressure in the combustion chamber and gas with cal orific value of 8600 kcal m3 Maximum gas pressure 150 mbar Electrical supply 3N 380V 60 Hz Fan motor rpm V kW A 335...

Страница 4: ...rol box reset button 5 Servomotor connection 6 Fair leads 7 Wiring terminal block 8 Reset push button of the motor over load relay 9 Air pressure switch 10 Gas pressure test point DIMENSIONS Length av...

Страница 5: ...us the pressurization value Example to obtain 800 kW it is necessary a gas pressure of 11 mbar and the combustion head set as indicated at page 8 If the combustion chamber is pressurized at 2 mbar the...

Страница 6: ...uld be carried out as follows Loosen the screws 2 UNHOOK THE TENSION ROD OF THE AIR DAMPER 1 remove the connecting lead of the servomotor withdraw the group A from the group B After the setting re ass...

Страница 7: ...5244 5 BURNER ELECTRICAL WIRING carried out y the factory D3377...

Страница 8: ...force in the Country Leads minimal section 1 mm2 Adjustment for the motor thermal relay at the beginning of the scale for 380V at the end of the scale for 220V Burners with non stop operation For saf...

Страница 9: ...controller modulating version 8 Pre sheared holeg Further prospective signals or controls can be connected to the burner wiring terminal board by removing the metal weldnuts from the pre sheared holes...

Страница 10: ...west set point When the burner is operating increase the adjustment pressure by turning slowly clockwise the knob till reaching the burner lock out There after turn the knob anticlockwise for 1 mbar a...

Страница 11: ...3 is coincident with the desired set point on the plate 4 Tighten the screws 1 Gas setting Loosen the screw 5 move the ring 6 so that the pointer 7 is coincident with the desired set point 8 Tighten...

Страница 12: ...t button 1st cam it controls the min stroke and remains always positioned on 0 in this way when the burner is off the air damper is totally closed 2nd cam it controls the max stroke generally it is po...

Страница 13: ...justable profile 7 of the cam by gradually acting on the screws 9 3 2 Minimal output setting Gas Disjoint the cam with adjustable profile 6 by means of the button 5 Turn manually anticlockwise the cam...

Страница 14: ...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 D...

Страница 15: ...N CURRENT The minimum current necessary for the control box operation is 6 A The burner normally supplies a higher current value so that no check is needed However if a measurement of the ionization c...

Страница 16: ...ion of the flame detecting circuit because of probe to earth defective internal amplifier P Stop during pre purge phase because of the servomotor does not change over the minimal opening circuit in be...

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Страница 20: ...Subject to modifications RIELLO S p A I 37045 Legnago VR Tel 39 0442 630111 http www riello it http www rielloburners com...

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