Nozzle Assembly; Calibrations Before Firing - Riello RL 25 BLU TC Installation, Use And Maintenance Instructions

D1752
(A)
(B)
2
1 3
(C)
0 1 2 3
4
5
(D)
N° Notches
Light oil delivery in 2nd stage
(E)
4 5
9

NOZZLE ASSEMBLY

Loosen the screws 2)(A) and remove the flame-
holder unit 1)(A), remove the plastic plug 3)(A)
and assemble the nozzle.
Do not use any sealing products such as gas-
kets, sealing compound, or tape. Be careful to
avoid damaging the nozzle sealing seat.
The nozzles must be screwed into place tightly
but not to the maximum torque value provided by
the wrench.
Make sure that the electrodes are positioned as
shown in Figure (B).
Finally remount the burner 4)(C) to the slide bars
3) and slide it up to the flange 5), keeping it
slightly raised to prevent the flameholder unit
from pressing against the slide bars 6) of the
blast tube.
Tighten the screws 2)(C) on the slide bars 3) and
screw 1) that attaches the burner to the flange.
If it proves necessary to change the nozzle with
the burner already fitted to the boiler, open the
burner on the slide bars as shown in fig (B) page
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8 and proceed as described above.
NOTE. The nozzle supplied may be used if it
matches required delivery, otherwise it should be
6
replaced with a different one whose delivery suits
the system.
CALIBRATION BEFORE FIRING
WARNING
DANGER
• COMBUSTION HEAD SETTING
The setting of the combustion head depends ex-
clusively on the delivery of the burner in the 2nd
20156621 stage - in other words, the combined delivery of
the two nozzles selected on page 8.
Turn screw 4)(D) until the notch shown in dia-
gram (E) is level with the front surface of flange
5)(D).
Example:
RL 25 BLU burner with 3.5 GPH nozzle and 14
bar pump pressure: from table (C), page 8 a de-
livery of 15.6 kg/h is obtained.
Diagram (E) indicates that for a delivery of 15.6
kg/h the RL 25 BLU Model requires the combus-
tion head to be set to approx. 3 notches, as
shown in Figure (D).
• PUMP ADJUSTMENT
No settings are required for the pump, which is
set by the manufacturer to
- 22 bar: high pressure,
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- 9 bar: low pressure,
This pressure must be checked and adjusted (if
required) after the burner has been ignited.
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• FAN GATE ADJUSTMENT
For the first time the burner is fired leave the fac-
tory setting unchanged for both 1st stage and
2nd stage operation.
In summing up, the adjustments to be executed
prior to the first firing are:
• Selection and installation of the nozzle.
kg/h
• Adjustment of combustion head.
The following aspects need not be modified:
Kg/h
• Pump pressure.
• Air gate valve adjustment, 1st stage.
• Air gate valve adjustment, 2nd stage.
The installation of the burner must be
carried out by qualified personnel, as
indicated in this manual and in com-
pliance with the standards and regu-
lations of the laws in force.
All the installation, maintenance and
disassembly operations must be
carried out with the electricity supply
disconnected