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Installation

4.7 Combustion head adjustment

At this point of the installation, the combustion head is fixed

to the boiler as shown in Fig. 13. It is therefore especially

easy to adjust, and this adjustment depends only on the max-

imum output of the burner.

Two adjustments of the head are foreseen:

³ the air adjustment;

³ the gas adjustment.

In the diagram of Fig. 17, find the notch at which to adjust

both air and central gas/air.

Air adjustment

Rotate the screw 2) until the notch you have found corre-

sponds with the front surface 1) of the flange.

Gas adjustment (RS 70-100-130/E MZ)

Loosen the 4 screws and turn ring 5) until the notch identified

is aligned with index 6).

Tighten the 3 screws 4) fully down.

Gas adjustment (RS 190/E - RS 250/E MZ)

When the burner is installed for maximum burner output

≤ 1300 Mcal/h (approx. 1500 kW) fit the discs 1)-2)(Fig. 16),

supplied as part of the standard equipment, removing the

internal tube 3)(Fig. 16). If the mains gas pressure is low, the

head can be left in the standard set-up, limiting the modula-

tion minimum to 450 Mcal/h (approx. 520 kW).

Example

RS 70/E MZ, burner output = 581 kW.

According to diagram Fig. 17 the gas and air adjustments for

this output are carried out on notch 3.

NOTE

The diagram indicates the optimum adjustment for a type of

boiler according to Fig. 4.

Important

To facilitate adjustment, loosen the screw 3),

adjust and then lock.

Fig. 16

231

D8084

D8039

RS 70-100-130/E MZ

RS 190/E - RS 250/E MZ

Fig. 15

CAUTION

No. of Notches

Maximum output of burner

D8040

Fig. 17

Maximum burner output

1200

19001700150013001100

Mcal / h

1400 1600 1800 2000 2200 280026002400

2100 2300 2500

RS 250/ ERS 190/ E

No. of Notches

D720

RS 70/E MZ RS 130/E MZ

RS 190/E

RS 100/E MZ

RS 250/E MZ

in progress

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 55 56

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