Burner Calibration - Riello 3470210 Installation, Use And Maintenance Instructions

(A)
Burner
Off
On
(B)
50 Hz Versions
RL 34 MZ RL 44 MZ
 
GPH GPH
2,25 20 3,00 22
2,50 23 3,50 26
3,00 27 4,00 28
3,25 30 4,50 30
3,50 33 5,00 32
4,00 37
4,50 40
RL 34 MZ RL 44 MZ
kg/h mbar kg/h mbar
13 5.4 20 4.2
14 5.6 22 4.7
16 5.7 24 4.9
18 5.9 26 5.1
20 6.0 29 5.4
22 6.2 32 5.6
24 6.4 35 6.3
26 6.6 38 7.4
28 6.7 40 8.6
30 6.9 41 9.0
32 7.0
34
7.1
3 4 5 6 8
Stage
1 2
1st
2nd
60 Hz Versions
RL 34 MZ RL 44 MZ
 
GPH GPH
2,25 20 3,00 20
2,50 22 3,50 24
3,00 25 4,00 26
3,25 28 4,50 28
3,50 30 5,00 30
4,00 32
4,50 35
2nd STAGE
mbar = Air pressure in 1) with zeropressure in 2)
D3873
2
7
1
D3872
D469
1st STAGE
 = Notch Nr.
(C)
(D)
11

BURNER CALIBRATION

! ATTENTION
QUALIFIED PERSONNEL WITH THE RIGHT
INSTRUMENTS MUST
BURNER'S START-UP.
FIRING
Set switch 1)(B) to "ON".
During the first firing, during the passage from
the 1st to the 2nd stage, there is a momentary
lowering of the fuel pressure caused by the fill-
ing of the 2nd stage nozzle tubing. This lowering
of the fuel pressure can cause the burner to
lockout and can sometimes give rise to pulsa-
tions.
Once the following adjustments have been
made, the firing of the burner must generate a
noise similar to the noise generated during oper-
ation. If one or more pulsations or a delay in fir-
ing in respect to the opening of the light oil
solenoid valve occur, see the suggestions pro-
vided on p. 14: causes 34 to 42.
OPERATION
The optimum calibration of the burner
requires an analysis of the flue gases at the
boiler outlet and interventions on the follow-
ing points:
• 1st and 2nd 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 2nd
stage delivery of the burner is changed.
• Pump pressure
12 bar: This is the pressure calibrated in the fac-
tory which is usually sufficient for most pur-
poses. Sometimes, this pressure must be
adjusted to:
10 bar in order to reduce fuel delivery. This is
only possible if the room temperature is above
0 °C. Never fall below 10 bar: at which pres-
sures the cylinders may have difficulty in open-
ing;
14 bar 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 screw
5)(A), p. 9.
• 1st stage fan air gate valve
Keep the burner operating at 1st stage by set-
ting the switch 2)(B) to the 1st stage position.
Opening of the air gate valve 1)(A) must be
adjusted in proportion to the selected nozzle:
the index 7)(A) must be aligned with the speci-
fied in table (C). This adjustment is achieved by
turning the hex element 4):
- in rh direction (- sign) the opening is reduced;
- in lh direction (+ sign) the opening increases.
Example:
RL 44 MZ - 1st stage nozzle 3.00 GPH:
notch 22° aligned with index 7(A).
When the adjustment is terminated lock the hex
element 4) with the ring nut 3).
• 2nd stage fan air damper valve
Set switch 2)(B) to the 2nd stage position and
adjust the air gate valve 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
approximately the same as the pressure speci-
fied in table (D) plus the combustion chamber
pressure measured 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 3 mmc Allen
key 8)(A).
HANDLE THE