Setting The Combustion Head - Riello RS 28 Instrucciones De Instalación, Funcionamiento Y Mantenimiento

(A)
Notches nr. (Air = Gas)
Burner output in 2nd stage operation
(C)
(D)

SETTING THE COMBUSTION HEAD

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 output developed by
the burner in 2nd stage operation.
It is therefore essential to establish this value
before proceeding to set up the combustion
head.
There are two adjustments to make on the
head:
air and gas deliveries.
In diagram (C) find the notch to use for adjusting
the air and the gas, and then proceed as fol-
lows:
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Air adjustment (A)
(B)
Turn screw 4)(A) until the notch identified is
aligned with the front surface 5)(A) of the flange.
Gas adjustment (B)
Loosen screws 1)(B) and turn ring 2) until the
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notch identified is aligned with index 3).
Tighten the screw 1) fully down.
Example RS 38:
burner output = 337 kW (290 Mcal/h).
If we consult diagram (C) we find that for this
output, air and gas must be adjusted using
notch 3, as shown in figs.(A) and (B).
Note
Diagram (C) shows the ideal settings for the
combustion head. If the gas mains pressure is
too low to reach the 2nd stage operation pres-
sure indicated on page 5, and if the ring 2)(B) is
not fully open, it can be opened wider by 1 or 2
notches.
Continuing with the previous example, page 5
indicates that for burner RS 38 with output of
337 kW (290 Mcal/h) a pressure of approxi-
mately 4,6 mbar is necessary at test point 6)(A).
If this pressure cannot be reached, open the
ring 2)(B) to notch 4 or 5.
Make sure that the combustion characteristics
are satisfactory and free of pulsations.
Once you have finished setting up the head, refit
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the burner 4)(D) to the slide bars 3) at approxi-
mately 100 mm from the sleeve 5) - burner posi-
tioned as shown in fig.(B)p.6 - insert the flame
detection probe cable and the ignition electrode
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).
Secure the burner to the sleeve by tightening
screw 1) and then refit the split pin into one of
two slide bars 3).
Reconnect the articulation 8) to the graduated
sector 7).
Important
When fitting the burner on the two slide bars, it
is advisable to gently draw out the high tension
cable and flame detection probe cable until they
are slightly stretched.
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