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4.7.1
Choice of nozzles for 1
Both nozzles must be chosen from among those listed in Tab. H.
The first nozzle determines the delivery of the burner at low fire.
The second nozzle works together with the 1st nozzle to determine
the delivery of the burner at high fire.
The deliveries at low and high fire must be contained within the val-
ue range indicated on page 6.
Use nozzles with a 60° spray angle at the recommended pressure
of 174 PSI.
The two nozzles usually have equal deliveries.
Nozzle
60
GPH
145 PSI 174 PSI 203 PSI 174 PSI
2.50
3.00
RLS 38/E
3.50
4.00
4.50
5.00
2.50
3.00
3.50
4.00
RLS 50/E
4.50
5.00
5.50
6.00
Example:
Boiler output = 1360 MBtu/hr efficiency 80 %
Output required by the burner: 1360/0.8 = 1700 MBtu/hr;
1700/2 = 850 MBtu/hr (4.50 GPH) for nozzle
Therefore, two equal, 60°, 174 PSI nozzles are required:
1° = 4.50 GPH with 2° = 4.50 GPH,
or the following two different nozzles:
1° = 5.00 GPH with 2° = 4.00 GPH, or:
1° = 4.00 GPH with 2° = 5.00 GPH.
4.7.2
Nozzle assembly
➤ Remove screw 1)(Fig. 12) and extract the internal part 2);
➤ install two nozzles with the box wrench 1)(Fig. 13), after hav-
ing removed the plastic plugs 2);
➤ fitting the wrench through the central hole in the flame stability
disk or loosen screws 1)(Fig. 14);
➤ remove disk 2)(Fig. 14) and replace the nozzles using the
wrench 3).
The nozzle for low fire operation is the one underneath the firing
electrodes (Fig. 15).
Make sure that the electrodes are positioned as
shown in (Fig. 15).
WARNING
➤ Do not use any sealing products such as gas-
kets, sealing compound, or tape.
➤ Be careful to avoid damaging the nozzle seal-
WARNING
ing seat.
➤ The nozzles must be screwed into place tightly
but carefully.
20027066
st
nd
and 2
stage
GPH
MBTU/h
3.07
3.39
3.68
3.68
4.07
4.42
4.32
4.74
5.16
4.93
5.44
5.89
5.54
6.12
6.63
6.15
6.79
7.36
3.07
3.39
3.68
3.68
4.07
4.42
4.32
4.74
5.16
4.93
5.44
5.89
5.54
6.12
6.63
6.15
6.79
7.36
6.76
7.46
8.10
7.40
8.17
8.87
Installation
475
570
664
762
857
951
475
570
664
762
857
951
1044
1144
Tab. H
D2539
20
GB
D1122
D1146
D1147
Fig. 12
Fig. 13
Fig. 14
Fig. 15
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