Combustion Head Adjustment - Riello RS 68/M BLU Installation, Use And Maintenance Instructions

5.9

Combustion head adjustment

At this point of the installation, the combustion head is fixed to the
boiler as shown in Fig. 12. It is therefore especially easy to adjust,
and this adjustment depends only on the maximum output of the
burner.
Two combustion head adjustments are available:
– external air R1
– central gas/air R2
No. notches
External air R1 adjustment
 Turn the screw 4)(Fig. 17) until the notch found lines up with
the front surface 5) of the flange.
To facilitate the adjustment, loosen the screw
6)(Fig. 17), adjust, then block.
ATTENTION
Gas adjustment
 Loosen the 3 screws 1)(Fig. 17) and rotate the ring nut 2)
until the notch you have found corresponds with the
indicator 3).
 Block the 3 screws 1).
Example:
RS 120/M BLU, burner output = 850 kW.
The diagram (Fig. 16) shows that for this output the settings are:
– air R1
– gas R2
The burner leaves the factory with the ring nut 3)
set to notch 0.
Do not change this value.
ATTENTION
NOTE:
the diagram (Fig. 16) indicates the optimum adjustment for a
type of boiler according to Fig. 3 on page 10.
= notch 4
= notch 3
Installation
In the diagram of (Fig. 16), find the notch at which both air and
central gas/air should be adjusted.
Max burner output
D1256
If gas pressure allows it, NOx reduction can be obtained by
closing ring nut 2)(Fig. 17).
When fitting the burner on the two slide bars, it is
advisable to gently draw out the high voltage
cable and the flame detection probe cable until
they are slightly stretched.
ATTENTION
19 GB
D2381
Fig. 16
Fig. 17
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