Combustion Head Adjustment - Riello 20010541 Installation, Use And Maintenance Instructions

5.8

Combustion head adjustment

At this point of the installation, the combustion head is fixed to the
boiler as shown in Fig. 14.
It is therefore especially easy to adjust, and this adjustment de-
pends only on the maximum output of the burner.
No. notches
10
9
8
7
6
5
4
3
2
1
0
1100
1200 1400
Air adjustment
 Rotate the screw 2)(Fig. 18) until the notch you have found
corresponds with the front surface 1) of the flange.
To facilitate adjustment, loosen the screw
3)(Fig. 18), adjust and then lock.
WARNING
1
2
3
6
5
4
20010575
Installation
1300 1500 1700
1600 1800 2000
Max burner output
D9262
Fig. 18
Two adjustments of the head are foreseen:
– air
– gas
In the diagram (Fig. 17) find the notch at which to adjust both air
and central gas/air.
RS 250/ E
RS 250/E MZ
1900 2100
2200 2400
Gas adjustment
When the burner is installed for maximum burner
output  1300 Mcal/h (approx. 1500 kW) is neces-
sary:
 remove the inner tube 3)(Fig. 19) and install
WARNING
the discs 1) -2) supplied as equipment.
If the mains gas pressure is low, the head can be
left in the standard set-up, limiting the modulation
minimum to 450 Mcal/h (approx. 520 kW).
D8084
1
Example:
RS 250/E burner output = 1800 kW.
According to diagram (Fig. 17) the gas and air adjustments for
this output are carried out on notch 5.
NOTE:
The diagram indicates the optimum adjustment for a type of boiler
according to Fig. 4 at page 11.
The adjustments indicated can be modified during
the initial start-up.
WARNING
24 GB
D9263
2300 2500 M cal / h
2600 2800 kW
3
Fig. 17
2
Fig. 19