Adjustment Of The Combustion Head; Air Adjustment; Gas Adjustment - Riello RS 120/EV BLU Installation, Use And Maintenance Instructions

4.10 Adjustment of the combustion head

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.

4.10.1 Air adjustment

Turn screw 4)(Fig. 17) until the notch identified is aligned with the
front surface 5)(Fig. 17) of the flange.
To facilitate adjustment, loosen the screw 3)
(Fig. 17), adjust and then lock.
CAUTION

4.10.2 Gas adjustment

 Loosen the 3 screws 4)(Fig. 17) and turn ring 5) until the notch
identified is aligned with index 6).
 Tighten the 3 screws 1) fully down.
Example:
burner output = 3750 MBtu/hr
If we consult diagram (Fig. 16) we find that for this output the ad-
justments are:
– air: R1 = notch 2;
– gas: R2 = notch 5.
Note
Diagram (Fig. 16) indicates an optimal regulation for a type of boiler
seen in Fig. 4 at page 10.
If the pressure of gas allows it, by closing ring nut (Fig. 4 at
page 10) a reduction of the formation of NOx is obtained.
Continuing with the previous example, (Fig. 22 at page 23) indi-
cates that for burner with output of 3750 MBtu/hr a pressure of ap-
proximately 2.8" is necessary at test point 3)(Fig. 17).
If this pressure cannot be reached, open the ring 5)(Fig. 17) to
notch 4 or 5.
Make sure that the combustion characteristics are satisfactory and
free of pulsations.
20102152
Installation
Two adjustments of the head are foreseen:
 air adjustment R1
 gas adjustment R2
In the diagram of Fig. 16, find the notch at which to adjust both air
and central gas/air.
Burner output
6
5
4
20 GB
20104294
1
2
3
D9804
Fig. 16
Fig. 17