Siemens LFL Series Service Manual download pdf (Page 12)

BURNER STARTING

Close the control circuit, with the switch in fig. C) in the

AUTO position.

On firing (pilot burner and main valve) turn the switch (C)

to MAN and the switch 1)(E) in the AUT position.

MAXIMUM OUTPUT

Using button (B), "increase output" until it stops, app.

130° (cam 1).

Place the slide switch on MAX and set the relative MAX

trim potentiometer (setting must be very near to 130°) to

exploit as far as possible the variable profile cam 4)(D)

and have the gas butterfly valve on maximum opening,

graduated sector 2) on index 3) fig. (D).

The setting of the gas flow must be made on the gas train

regulator and, if necessary, on the gas valve.

The air setting must be made on the variable profile cam

4)(D) by turning the screws 5), after loosening the screws

6).

MINIMUM OUTPUT

With the slide switch on the OPE position, use button (B)

"decrease output" until it stops at app. 20° (cam 3).

Put the slide switch in the MIN position and set the mod-

ulation minimum using the relative MIN trim potentiome-

ter.

Set the air using the variable profile cam 4)(D).

If a lower modulation minimum is required than the level

set on cam 3 of the servomotor (20°), decrease the cam

setting.

INTERMEDIATE OUTPUTS

With the switch (C) in the AUTO position, the slide switch

in the OPE position and the switch 1)(E) in the MAN po-

sition, move the button 2)(E) in various intermediate lev-

els between maximum and minimum and set the variable

profile cam 4)(D) to achieve optimum combustion, by

turning the screws 5).

If possible, do not change the previously set maximum

and minimum levels.

Check the various setting levels with a combustion anal-

ysis.

Important

Make a progressive adjustment of the profile, without

sharp changes.

When the setting is complete, lock the cam profile using

screws 6)(D).

Turn the burner off, release the servomotor as shown in

fig. (B) page 11 and manually turn cam 4)(D) to check

there is no binding.

Finally fix the adjustment by turning the screws 6)(D).

(B) (C)

(D)

1Servomotor

2 Graduated sector for gas butterfly valve

3 Index for graduated sector 2

4 Adjustable profile cam

5 Adjustment screws for cam starting profile

6 Adjustment fixing screws

7 Adjustment screws for cam and profile

(A)

Slide switch

Trim potentiometers

Position jumpers

(E)

D791

D2593

D2594

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Siemens LFL Series Service Manual Page 12

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