Setting The Combustion Head - Riello RS 70 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:
Air adjustment (A)
Turn screw 4)(A) until the notch identified is
D719
aligned with the front surface 5)(A) of the flange.
(B)
Gas adjustment (B)
Loosen the 3 screws 1)(B) and turn ring 2) until
the notch identified is aligned with index 3).
Tighten the 3 screws 1) fully down.
Example RS 70:
Burner output = 581 kW (500 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 70 with output of
581 kW (500 Mcal/h) a pressure of approxi-
D720
mately 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
the burner to the slide bars 3)(D) at approxi-
mately 100 mm from the sleeve 4)(D) - burner
positioned 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).
Reconnect the articulation 7) to the graduated
sector 6).
D3032
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.
7