8
NOZZLE ASSEMBLY
Loosen the screws 2)(A) and remove the flame-
holder unit 1)(A), remove the plastic plugs 3)(A)
and assemble the nozzles: do not use any seal-
ing products such as gaskets, sealing com-
pound, or tape. Be careful to avoid damaging the
nozzle sealing seat. The nozzles must be
screwed into place tightly but not to the maxi-
mum 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 slight-
ly 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
7, after having mounted the extensions 15)(A)
page 4, and proceed as described above.
NOTE.
The nozzle supplied may be used if it
matches required delivery, otherwise it should be
replaced with a different one whose delivery suits
the system.
CALIBRATION BEFORE FIRING
• COMBUSTION HEAD SETTING
The setting of the combustion head depends ex-
clusively on the delivery of the burner in the 2nd
stage - in other words, the combined delivery of
the two nozzles selected on page 7.
Turn screw 4)(D) until the notch shown in dia-
gram (E) is level with the front surface of flange
5)(D).
Example:
RL 22 BLU burner with 4.00 GPH nozzle and 14
bar pump pressure: from table (C), page 7 a de-
livery of 17.8 kg/h is obtained.
Diagram (E) indicates that for a delivery of 17.8
kg/h the RL 22 BLU Model requires the combus-
tion head to be set to approx. 2 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,
- 9 bar: low pressure,
This pressure must be checked and adjusted (if
required) after the burner has been ignited.
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.
• Adjustment of combustion head.
The following aspects need not be modified:
• Pump pressure.
• Air gate valve adjustment, 1st stage.
• Air gate valve adjustment, 2nd stage.
(B)
(C)
(D)
SETTING THE COMBUSTION HEAD
kg/h
N° Notches
(A)
Light oil delivery in 2nd stage
D1752
D1753
D818
D10322
D819
(E)
