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inch
A
B
RL 28/2
6
"
8
5 / 16
13 / 16
RL 38/2
6
"
8
5 / 16
13 / 16
RL 50/2
6
5 / 16
"
8
13 / 16
(A)
(B)
Nozzle
60
size
2.00
2.25
RL 28/2
2.50
3.00
3.50
2.50
3.00
3.50
RL 38/2
4.00
4.50
5.00
3.00
3.50
4.00
RL 50/2
4.50
5.00
5.50
6.00
(C)
C
"
3 / 8
W
"
3 / 8
W
"
3 / 8
W
GPH
145 PSI
174 PSI
203 PSI
2.47
2.72
2.95
2.75
3.04
3.33
3.07
3.39
3.68
3.68
4.07
4.42
4.32
4.74
5.16
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
3.68
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
6.75
7.46
8.10
7.40
8.17
8.87
D455
D2280
MBtu/hr
174 PSI
381
428
475
570
664
475
570
664
762
857
951
570
664
762
857
951
1044
1144
D339
6
INSTALLATION
BOILER PLATE (A)
Drill the combustion chamber mounting plate as
shown in (A). The position of the threaded holes can
be marked using the burner gasket supplied with the
burner.
BLAST TUBE LENGTH (B)
The length of the blast tube must be selected accord-
ing to the indications provided by the manufacturer of
the boiler, and it must be greater than the thickness of
the boiler door complete with its insulation. The range
of lengths available, L (inch), is as follows:
Blast tube 7):
RL 28/2
• short
8
1 / 2
"
• long (with the kit)
13
13 / 16
For boilers with front flue passes 10) or flame inversion
chambers, protective insulation material 8) must be in-
serted between the boiler's refractory 9) and the blast
tube 7).
This protective insulation must not compromise the ex-
traction of the blast tube.
For boilers having a water-cooled front, the insulation
8)-9)(B) is not required unless it is required by the
boiler manufacturer.
SECURING THE BURNER TO THE BOILER (B)
Disassemble the blast tube 7) from the burner 4) by
proceeding as follows:
- Remove the screws 2) from the two slide bars 3).
- Remove the screw 1) fixing the burner 4) to the
flange 5).
- Withdraw the blast tube 7) complete with flange 5)
and slide bars 3).
Secure flange 5)(B) to the boiler plate inserting the
supplied gasket 6). Use the 4 screws provided after
having protected the thread with an anti-seize product
(high-temperature grease, compounds, graphite).
The burner-boiler seal must be airtight.
CHOICE OF NOZZLES FOR 1st AND 2nd STAGE
Both nozzles must be chosen from among those listed
in Table (C).
The first nozzle determines the delivery of the burner
at low fire.
The second nozzle works in combination with the low
fire nozzle to determine the delivery of the burner at
high fire.
The total deliveries of the low and high fire nozzles
must be contained within the value range indicated on
page 3.
Use nozzles with a 60° spray angle at the recom-
mended pressure of 174 PSI.
The two nozzles usually have equal deliveries, but the
low fire nozzle may have the following specifications if
required:
• a delivery less than 50% of the total delivery when-
ever the back-pressure peak must be reduced at
the moment of firing;
• a delivery higher than 50% of the total delivery
whenever the combustion during low fire must be
improved.
RL 38/2
RL 50/2
8
1 / 2
"
8
1 / 2
"
"
13
13 / 16
"
13
13 / 16
"
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