Siemens LFL Series Service Manual download pdf (Page 7)

INSTALLATION

BOILER PLATE (A)

Drill the combustion chamber mounting plate as shown

in (A). The position of the threaded holes can be marked

using the burner head gasket supplied with the burner.

BLAST TUBE LENGTH (B)

The length of the blast tube must be selected according

to the indications provided by the manufacturer of the

boiler, it must be greater than the thickness of the boiler

door complete with its insulation. The length available, L

(inches), is 14

“.

For boilers with front flue passes 15) or flame inversion

chambers, protective insulation material 13), must be

inserted between the boiler refractory 14) and the blast

tube 12).

This protective insulation must not compromise the

extraction of the blast tube.

For boilers having a water-cooled front, the insulation

13)-14) is not required unless it is required by the boiler

manufacturer.

SECURING THE BURNER TO THE BOILER (B)

Before securing the burner to the boiler, check through

the blast tube opening to make sure that the flame sen-

sor probe (flame rod) is correctly set in position, as

shown in (C).

Now detach the combustion head from the burner, fig.

(B):

- loosen the four screws 3) and remove the cover 1);

- disengage the swivel joint 7) from the graduated sector

8);

- remove the screws 2) from the slide bars 5);

- remove the two screws 4) and pull the burner back on

slide bars 5) by about 4”;

- disconnect the wires from the flame rod and the elec-

trode and then pull the burner completely off the slide

bars.

Secure the flange 11)(B) to the boiler plate, inserting the

gasket 9)(B). Use the 4 screws, also supplied with the

unit, after first protecting the thread with an anti-locking

product.

The seal between burner and boiler must be airtight.

If you noticed any irregularities in the positions of the

flame rod or ignition electrode during the check men-

tioned above, remove screw 1)(D), extract the internal

part 2)(D) of the head and set up the two components

correctly.

IGNITION PILOT ADJUSTMENT

Place the pilot and electrode as shown in fig. (C).

The pilot works correctly at pressures ranging from 5 -

12” WC.

Important

To set the pilot without main burner operaton, proceed

as follows:

- Move the jumper from terminals "30-V11" to terminals

"30-VP", as given in fig. (E), this way the main valve is

cut out.

- With the burner in the manual position, hold the air

damper in the minimum position and make the setting.

- When the setting is correct, replace the jumper on “30-

V11”.

(C)

ABC

“12

“ - 14

“

D455

(A)

(E)

Probe

Electrode

(B)

D1706

Ignition

pilot

D2799

(D)

MB - Burner terminal strip

D2800

D2317

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Siemens LFL Series Service Manual Page 7

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