29
20151674
GB
Start-up, calibration and operation of the burner
6.8
Combustion head
The combustion head comprises a highly heat resistant cylinder
whose surface features numerous holes, encased in a metal
"mesh". The air-gas mixture is pushed inside the cylinder and out
of the head through the holes in the perimeter.
Combustion starts when the air-gas mixture is ignited by a spark
generated by the electrode.
The metal "mesh" is the combustion head's most essential ele-
ment since it improves burner performance considerably.
The flame developed on the surface of the head is perfectly re-
tained and adheres to the mesh when operating at the maximum
setting. This allows modulating ratios as high as 6:1, avoiding the
danger of flashback when modulating is at its minimum.
The flame features an extremely compact geometry, meaning
that there is no risk of contact between the flame and parts of the
boiler, consequently eliminating the possible problem of poor
combustion.
The flame's structure means that smaller combustion chambers
can be developed, designed to exploit this particular feature.
6.9
Setting and safety parameters (programmed control box)
Tab. Q
CAUTION
Before starting up the burner, it is good practice to
adjust the gas train so that ignition takes place in
conditions of maximum safety, i.e. with gas deliv-
ery at the minimum.
D9714
Fig. 14
No.
Parameter
OEM-preset
Value
1
pre-purging time
30
Seconds
2
Safety time
3
Seconds
3
Flame stabilisation time
10
Seconds
4
Ignition attempts
3
Number
5
Post-purging time
0
Seconds
6
Pre-ignition time
3
Seconds
7
Attempts in the event of flame loss during operation
1
Number
8
Pre-post purging speed
5300
Rotations/min
9
Number of fan rotations: number of ignition load rotations (P0)
2100
Rotations/min
10
Number of fan rotations: number of minimum load rotations (P1)
1320
Rotations/min
11
Number of fan rotations: number of nominal load rotations (P2)
5800
Rotations/min
12
Limit number of ignition load rotations (P0) Minimum limit
2100
Rotations/min
13
Limit number of ignition load rotations (P0) Maximum limit
4020
Rotations/min
14
Limit number of minimum load rotations (P1) Minimum limit
1320
Rotations/min
15
Limit number of minimum load rotations (P1) Maximum limit
2280
Rotations/min
16
Limit number of nominal load rotations (P2) Minimum limit
4020
Rotations/min
17
Limit number of nominal load rotations (P2) Maximum limit
6000
Rotations/min
18
Maximum number of fan rotations
8400
Rotations/min
19
Minimum load
nominal load ascending ramp
20
Seconds
20
Nominal load
minimum load descending ramp
20
Seconds
21
Pulses for rotation
2
Pulses/rotation
22
Analogue input (Return signal potentiometer ASZxx.3x)
0
-
0: 3-point input
1: 0-10 V
2: 0-135
3: 0-20 mA
4: 4-20 mA with lockout at I < 4 mA
5: 4-20 m
Summary of Contents for RX 150 S/PV
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