Nozzle Assembly; Combustion Head Setting - Baxi TECNO 28-L Instrucciones De Instalación, Funcionamiento Y Mantenimiento

D458
(A)
(C)
D461
(D)

COMBUSTION HEAD SETTING

(E)
Notches nr.
(F)
D590
D460
Light oil delivery
kg/h
Example with TECNO 38-L
Boiler output = 270 kW - efficiency 90 %
Output required by the burner =
270 : 0,9 = 300 kW
300 : 2
therefore, two equal, 60°, 12 bar nozzles are
required:
1° = 3,00 GPH - 2° = 3,00 GPH,
or the following two different nozzles:
1° = 2,50 GPH - 2° = 3,50 GPH,
or:
1° = 3,50 GPH - 2° = 2,50 GPH.

NOZZLE ASSEMBLY

At this stage of installation the burner is still dis-
assembled from the blast tube; it is therefore
(B)
possible to fit two nozzles with the box spanner
1)(A) (16 mm), after having removed the plastic
plugs 2)(A), fitting the spanner through the cen-
tral hole in the flame stability disk. Do not use any
sealing 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.
The nozzle for the 1st stage of operation is the
one lying beneath the firing electrodes fig. (B).
Make sure that the electrodes are positioned as
shown in fig. (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 flame stability disk from
pressing against the blast tube.
Tighten the screws 2) on the slide bars 3) and
screw 1) that attaches the burner to the flange.
If it proves necessary to change a nozzle with the
burner already fitted to the boiler, proceed as
outlined below:
- Retract the burner on its slide bars as shown
in fig. (B)p.5.
- Remove the nuts 1)(D) and the disk 2).
- Use spanner 3)(D) to change the nozzles.
COMBUSTION HEAD SETTING
The setting of the combustion head depends
exclusively on the delivery of the burner in the
2nd stage - in other words, the combined deliv-
ery of the two nozzles selected on page 6.
Turn screw 4)(E) until the notch shown in dia-
gram (F) is level with the front surface of flange
5)(E).
Example:
The TECNO 38-L Model with two 3.00 GPH
nozzles and 12 bar pump pressure.
Find the delivery of the two 3.00 GPH nozzles in
table (D), page 5:
12,7 + 12,7 = 25,4 kg/h.
Diagram (F) indicates that for a delivery of 25.4
kg/h the TECNO 38-L model requires the com-
bustion head to be set to approx. three notches,
as shown in fig. (E).
D462
D463
6
= 150 kW per nozzle