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(A)
(C)
(D)
SETTING THE COMBUSTION HEAD
(E)
N° Notches
Fuel oil delivery at high fire
(F)
D2281
D458
USGPH
Example with the RL 38/2 Model
Boiler output = 912 MBTU/hr - efficiency 80 %
Output required by the burner =
912 / 0.8 = 1140 MBTU/hr
1140 / 2
therefore, two equal, 60°, 174 PSI nozzles are
required:
1° = 3.00 GPH with 2° = 3.00 GPH,
or the following two different nozzles:
1° = 3.50 GPH with 2° = 2.50 GPH,
or:
1° = 2.50 GPH with 2° = 3.50 GPH.
(B)
D460
NOZZLE ASSEMBLY
At this stage of installation the burner is still disassem-
bled from the blast tube; it is now possible to fit two
nozzles, after having removed the plastic plugs 2)(A),
inserting the wrench through the central hole in the
flame stability disk. Do not use any sealing products
such as gaskets, sealing compound, or tape. Be care-
ful to avoid damaging the nozzle sealing seat. The
nozzles must be screwed into place tightly but careful-
ly.
The nozzle for the low fire of operation is the one lying
beneath the firing electrodes Fig. (B).
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 flame stability disk from pressing
D461
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.6.
- Remove the nuts 1)(D) and the disk 2).
- Use wrench 3)(D) to change the nozzles.
D462
COMBUSTION HEAD SETTING
The setting of the combustion head depends exclu-
sively on the delivery of the burner at high fire - in
D2282
other words, the combined delivery of the two nozzles
selected on page 6. Turn screw 4)(E) until the notch
shown in diagram (F) is level with the front surface of
flange 5)(E).
Example:
The RL 38/2 Model with two 3.00 GPH nozzles and
174 PSI pump pressure.
Find the delivery of the two 3.00 GPH nozzles in table
(C), page 6:
4 + 4 = 8 GPH.
Diagram (F) indicates that for a delivery of 8 GPH the
RL 38/2 Model requires the combustion head to be
set to approx. three notches, as shown in Figure (E).
7
= 570 MBTU/hr per nozzle
Warning: It is advisable to replace nozzles every
year during regular maintenance operations.
Caution: The use of nozzles other than those
specified by Riello S.p.A. and inadequate regular
maintenance may result into emission limits non-
conforming to the values set forth by the
regulations in force, and in extremely serious
cases, into potential hazards to people and
objects.
The manufacturing company shall not be liable for
any such damage arising from nonobservance of
the requirements contained in this manual.
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