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inch
A
RL 28/2
39
31 / 32
RL 38/2
39
31 / 32
RL 50/2 three-phase
39
31 / 32
RL 50/2 single-phase
39
31 / 32
H
C
G
inch
A
RL 28/2
18
23 / 32
RL 38/2
18
23 / 32
RL 50/2 three-phase
18
23 / 32
RL 50/2 single-phase
-
inch
E
RL 28/2
5
"
1 / 2
RL 38/2
5
"
1 / 2
RL 50/2 three-phase
5
"
31 / 32
RL 50/2 single-phase
5
"
31 / 32
Blast tube: short - long (obtainable with the kit)
(1)
B
C
lbs
"
24
"
19
"
80
13 / 16
11 / 16
"
24
"
19
"
84
13 / 16
11 / 16
"
24
"
19
"
86
13 / 16
11 / 16
"
24
"
21
"
88
13 / 16
11 / 16
D
A1
B
C
"
-
18
"
18
21 / 32
13 / 32
"
-
18
"
18
21 / 32
13 / 32
"
-
18
"
18
21 / 32
13 / 32
21
"
18
"
18
3 / 16
21 / 32
13 / 32
F
G
13
"
2
"
26
27 / 32
1 / 16
15 / 32
13
"
2
"
26
27 / 32
1 / 16
15 / 32
13
"
2
"
26
27 / 32
1 / 16
15 / 32
13
"
2
"
26
27 / 32
1 / 16
15 / 32
D2276
(A)
D7631
D88
(B)
A1
A
D7632
D
(1)
"
8
" - 13
"
1 / 2
13 / 16
"
8
" - 13
"
1 / 2
13 / 16
"
8
" - 13
"
1 / 2
13 / 16
"
8
" - 13
"
1 / 2
13 / 16
H
(1)
" - 31
"
3 / 4
" - 31
"
3 / 4
" - 31
"
3 / 4
" - 31
"
3 / 4
(C)
4
BURNER DESCRIPTION (A)
1 Ignition electrodes
2 Combustion head
3 Screw for combustion head adjustment
4 Flame sensor for flame monitoring
5 Screw for fixing fan to flange
6 Slide bars for opening the burner and inspecting
the combustion head
7 Hydraulic cylinder for regulation of the air damper in
low and high fire positions. When the burner is not
operating the air damper is fully closed in order to
reduce heat dispersion from the boiler due to the
flue draught which draws air from the fan suction in-
let.
8 Safety solenoid valve
9 Pump
10 Plate prearranged to drill 4 holes for the passage of
hoses and electrical cables.
11 Air inlet to fan
12 Fan pressure test point
13 Boiler mounting flange
14 Flame stability disk
15 Flame inspection window
16 Motor contactor
17 Flame safeguard control
18 Two switches:
- one "burner off - on"
- one for "low and high fire operation"
19 Burner terminal strip
20 Air damper
21 Pump pressure adjustment
22 Low and high fire valve assembly
23 Protection (for RL 50/2 single-phase burner)
Two types of burner failure may occur:
• FLAME SAFEGUARD LOCK-OUT:
if the flame relay 17)(A) push-button lights up, it in-
dicates that the burner is in lock-out.
To reset, press the push-button.
• MOTOR TRIP
(RL 38/2 - RL 50/2 three phase):
release by pressing the push-button on thermal over-
load.
PACKAGING-WEIGHT (B)
Approximate measurements
• The burner is shipped in cardboard box with the
maximum dimensions shown in table (B).
• The weight of the burner complete with packaging is
indicated in table (B).
MAX. DIMENSIONS (C)
Approximate measurements
The maximum dimensions of the burners are given in
(C).
Inspection of the combustion head requires the burner
to be opened and the rear part withdrawn on the slide
bars.
The maximum dimension of the burner, without casing,
when open is give by measurement H.
STANDARD EQUIPMENT
2 - Flexible hoses
1 - Burner head gasket
4 - Screws to secure the burner flange to the boiler:
3 / 8
W x 1"
1 - Instruction booklet
1 - Spare parts list
1 - Adaptor G 1/8" - 1/8" NPT
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