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(A)
Burner
Off
On
(B)
Low fire
RL 28/2
Nozzle
°
size
GPH
2.00
14
2.25
17
2.50
20
3.00
22
3.50
24
(C)
High fire
RL 28/2
Nozzle
size
"WC
GPH
4.50
2.40
5.10
2.50
5.80
2.60
6.40
2.70
7.00
2.80
7.70
3.00
8.30
3.30
9.00
3.50
"WC = air pressure in 1) with zero pressure in 2)
(D)
Stage
1
2
1°
2°
D469
RL 38/2
RL 50/2
Nozzle
Nozzle
°
size
size
GPH
GPH
2.50
12
3.00
3.00
18
3.50
3.50
20
4.00
4.00
22
4.50
4.50
23
5.00
5.00
26
5.50
6.00
RL 38/2
RL 50/2
Nozzle
Nozzle
size
"WC
size
"WC
GPH
GPH
6.40
2.70
8.00
2.40
7.00
2.70
9.30
2.40
7.70
2.70
10.60
2.50
8.30
2.70
11.80
2.60
9.30
2.70
13.10
2.60
10.20
2.70
14.40
3.00
11.20
3.10
16.00
4.00
12.10
3.70
16.00
3.60
D468
°
12
15
18
21
23
27
28
D2287
10
BURNER CALIBRATION
All the installation, maintenance and
disassembly operations must be carried
out
with
the
disconnected.
DANGER
The installation of the burner must be
carried out by qualified personnel, as
indicated in this manual and in compliance
with the standards and regulations of the
WARNING
laws in force.
FIRING
Set switch 1)(B) to "ON".
During the first firing, during the switch over from low
to high fire, there is a momentary lowering of the fuel
pressure caused by the filling of the high fire nozzle
tubing. This lowering of the fuel pressure can cause
the burner to lock-out and can sometimes give rise to
pulsations.
Once the following adjustments have been made, the
firing of the burner must generate a noise similar to
the noise generated during operation.
OPERATION
The optimum calibration of the burner requires an
analysis of the flue gases at the boiler outlet and
adjustments on the following points.
• Low and high fire nozzles
See the information listed on page 6.
• Combustion head
The adjustment of the combustion head already
carried out need not be altered unless the high fire
delivery of the burner is changed.
• Pump pressure
174 PSI: This is the pressure calibrated in the factory
which is usually sufficient for most purposes. Some-
times, this pressure must be adjusted to:
145 PSI in order to reduce fuel delivery. This adjust-
ment is possible only if the ambient temperature re-
mains above 0°C;
203 PSI in order to increase fuel delivery or to ensure
firings even at temperatures of less than 0°C.
In order to adjust pump pressure, use the relevant
screw 5)(A) page 9.
• Low fire air damper
Keep the burner operating at low fire by setting the
switch 2)(B) to the low fire. Opening of the air
damper 1)(A) must be adjusted in proportion to the
selected nozzle: the index 7)(A) must be aligned
with the rate specified in table (C). This adjustment
is achieved by turning the hex element 4)(A):
- in rh direction (- sign) the opening is reduced;
- in lh direction (+ sign) the opening increases.
Example RL 38/2 - low fire nozzle 3.00 GPH:
18° notch aligned with index 7(A).
When the adjustment is done lock the hex element
4) with the ring nut 3).
• High fire air damper
Set switch 2)(B) to the high fire position and adjust
the air damper 1)(A) by turning the hex element
6)(A), after having loosened the ring nut 5)(A).
Air pressure at attachment 1)(D) must be approxi-
mately the same as the pressure specified in table
(D) plus the combustion chamber pressure meas-
ured at attachment 2). Refer to the example in the
adjacent figure.
NOTE:
in order to facilitate adjustment of hex elements 4)
and 6)(A), use a 1/8" Allen key 8)(A).
electricity
supply
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