Siemens LFL Series Service Manual download pdf (Page 8)

COMBUSTION HEAD ADJUSTMENT

Installation operations are now at the stage where the

blast tube and sleeve are secured to the boiler as shown

in fig. (A). It is now a very simple matter to set up the

combustion head, as this depends solely on the maxi-

mum output developed by the burner.

It is therefore essential to establish this value before pro-

ceeding to set up the combustion head.

There are two adjustments to make on the head:

• outside air R1;

• central air R2.

In diagram (C) find the notch for:

 Outside air adjustment R1 (A)

Turn screw 4)(A) until the notch identified is aligned with

the front surface 5)(A) of the connector.

 Central air adjustment R2 (B)

Loosen the 3 screws 1)(B) and turn ring 2) until the

notch identified is aligned with index 3). Tighten the 3

screws 1) fully down.

Example

RS 160 /M LN

max. burner output = 5681 MBtu/hr

If we consult diagram (C) we find that for this output the

adjustments are:

• outside air: R1 = notch 8.6;

• central air: R2 = notch 0.

NOTES

• R2 adjustment (diagram C) is an indication only. If

possible, always keep the ring nut closed (notch 0); if air

recovery is required the nut may be opened following

the indications in diagram (C).

• Diagram (C) indicates an optimal regulation for a type

of boiler seen in fig. (B) page 5.

Make sure that the combustion characteristics are satis-

factory and free of pulsations.

Once you have finished setting up the head, refit the

burner to the slide bars 3)(D) at approximately 4” from

the sleeve 4)(D) - burner positioned as shown in fig. (B)

pag. 7 - insert the flame rod cable and the ignition elec-

trode cable and then slide the burner up to the sleeve so

that it is positioned as shown in fig. (D).

Refit screws 2) on slide bars 3) after mounting the

extension bracket and relative extensions.

Secure the burner to the sleeve by tightening screw 1).

Reconnect the swivel joint 7) to the graduated sector 6).

Connect gas train and pilot train as shown in fig. (A)

page 9.

Important

When fitting the burner on the two slide bars, it is advis-

able to gently draw out the high tension cable and flame

detection probe cable until they are slightly stretched.

IMPORTANT: In order to facilitate adjustment,

loosen screw 6)(A), adjust and then tighten.

(A)

(C)

(B)

Notches (Air = Gas)

Burner max output

(D)

D2801

D1707

D2367

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Siemens LFL Series Service Manual Page 8

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