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D699
(A)
Burner
Off
On
(C)
Low fire
RL 70
Nozzle
size
GPH
5
6
7
8
9
(D)
High fire
RL 70
Nozzle
size
GPH
13
16
19
22
"WC = Air pressure in 1) with zero pressure in 2)
(1) Without shutter 4)(C)p.6
(E)
Stage
1
2
1°
2°
D469
RL 100
Nozzle
Nozzle
N°
size
N°
size
GPH
GPH
2
7
2
10
2.3
8
2.1
11
2.6
9
2.2
12
2.7
10
2.4
13
2.8
11
2.6
14
12
2.7
15
13
2.8
16
14
2.9
17
18
19
RL 100
Nozzle
Nozzle
"WC
size
"WC
size
GPH
GPH
3.3
19
2.8
26
3.4
22
3.0
29
3.5
26
3.3
32
3.6
29
3.7
35
32
4.3
38
42
(B)
RL 130
N°
2
2.1
2.2
2.3
2.5
2.6
2.7
2.8
2.9
3
RL 130
"WC
2.7
2.8
3.0
3.2
3.5
4.3
3.3
(1)
D2330
10
BURNER CALIBRATION
FIRING
Set switch 1)(C) to "ON".
During the first firing, during the switch over from low
to the high fire, there is a momentary lowering of the
fuel pressure caused by the filling of the high fire noz-
zle 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 ad-
justments at the following points:
•
Low and high fire nozzles
See the information listed on page 6.
•
Combustion head
The adjustment of the combustion head already car-
ried out need not be altered unless the high fire de-
livery 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. Never calibrate to pressures below
145 PSI, at which pressures the cylinders may have
difficulty in opening;
203 PSI 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)p.11.
•
Low fire air damper
Keep the burner operating at low fire by setting the
switch 2)(C) to the low position. Opening of the air
damper 6)(B) must be adjusted in proportion to the
selected nozzle: the index 1)(A) must be aligned with
the notch 2)(A) specified in table (D). This adjust-
ment is achieved by turning the hex element 2)(B):
- in rh direction (- sign) the opening is reduced
- in lh direction (+ sign) the opening increases.
Example RL 70 - Low fire nozzle 6.00 GPH:
2.3 (A) notch aligned with index 1)(A).
When the adjustment is done lock the hex element
2)(B) with the ring nut 1).
•
High fire air damper
Set switch 2)(C) to the high position and adjust the
air damper 6)(B) by turning the hex element 4)(B), af-
ter having loosened the ring nut 3)(B).
Air pressure at attachment 1)(E) must be approxi-
mately the same as the pressure specified in table
(E) 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 2) and
4)(B), use a 1/8" Allen key 5)(B).
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