Burner Calibration; Firing; Operation - Riello RL 190 Two-Stage Operation

8

Burner calibration

8.1

Firing

Burner
Off
On
Notes on safety for the first start-up
The first start-up of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and regula-
tions of the laws in force.
WARNING
8.2

Operation

The optimum calibration of the burner requires an analysis of the
flue gases at the boiler outlet and interventions on the following
points:
 1st and 2nd stage nozzles
See the information listed on pag. 11.
 Combustion head
The adjustment of the combustion head already carried out need
not be altered unless the 2nd stage delivery of the burner is
changed.
 Pump pressure
12 bar: this is the pressure calibrated in the factory which is usu-
ally sufficient for most purposes. Sometimes, this pressure must
be adjusted to:
10 bar: in order to reduce fuel delivery. This adjustment is possi-
ble only if the surrounding temperature remains above 0°C. Nev-
er calibrate to pressures below 10 bar, at which pressures the
cylinders may have difficulty in opening;
14 bar: order to increase fuel delivery or to ensure firings even at
temperatures of less than 0°C.
20044168
Burner calibration
1 2 Stage
1st
2nd
D469
D1252
Check the correct working of the adjustment, com-
mand and safety devices.
WARNING
Set switch 1) (Fig. 20) to "ON".
During the first firing, during the passage from the 1st to the 2nd
Fig. 20
stage, there is a momentary lowering of the fuel pressure caused
by the filling of the 2nd stage nozzle tubing. This lowering of the
fuel pressure can cause the burner to lock-out and can some-
times give rise to pulsations.
Once the following adjustments have been made, the firing of the
burner must generate a noise similar to the noise generated dur-
ing operation. If one or more pulsations or a delay in firing in re-
spect to the opening of the light oil solenoid valve occur, see the
suggestions provided on pag. 24: causes 34 ÷ 42
In order to adjust pump pressure, use the relevant screw 5)
(Fig. 19 pag. 17)
 1st stage fan air gate valve
Keep the burner operating at 1st stage by setting the switch 2)
(Fig. 20) to the 1st stage position. Opening of the air gate valves
6) (Fig. 21) must be adjusted in proportion to the selected nozzle:
the index 8) (Fig. 21) must be aligned with the notch indicated on
the graduated sector 7) (Fig. 21).This adjustment is achieved by
turning the hex element 2) (Fig. 21):
– in rh direction (- sign) the opening is reduced;
– in lh direction (+ sign) the opening increases.
A
B
C
Fig. 21
D
E
F
G
H
 2st stage fan air gate valve
Set switch 2) (Fig. 20 pag. 18) to the 2nd stage position and ad-
just the air gate valve 6) (Fig. 21) by turning the hex element
4)(Fig. 21), after having loosened the ring nut 3) (Fig. 21).
NOTE:
in order to facilitate adjustment of hex elements 2) and 4)
(Fig. 21), use a 3 mm Allen key 5) (Fig. 21).
18 GB
J7 C
kg/h 230
bar 10 - 21
bar 0,45
cSt 2,8 - 200
°C 90
bar 1.5
bar 12
mm 0,170
Tab. D