29
20190798
GB
Start-up, calibration and operation of the burner
5.7
Burner operation
5.7.1
Burner start-up
•
0s:
TL closes.
•
2s:
The control box starting cycle starts. Servomotor
starts: 130° rotation to right, until contact is made on
cam I (Fig. 28).
•
35s:
The air gate valve is positioned to MAX. output.
Fan motor starts.
Start of the pre-purging phase.
•
60s:
The servomotor turns to the left to reach the angle set
on cam III (Fig. 28 on page 24) for the MIN output.
•
77s:
The air gate valve and the gas butterfly are positioned
to MIN. output (with cam III)(Fig. 28 at 65°).
•
92s:
Ignition electrode strikes a spark.
Safety valve VS and adjustment valve VR (rapid
opening) open. The flame is ignited at a low output
level, point A. Output is then progressively increased,
with the valve VR opening slowly up to MIN. output,
point B.
•
95s:
The spark goes out.
•
102s: The control box starting cycle ends.
The control box starting cycle ends. When heat demand (TL) is
satisfied, the post-purging phase (*20s) starts.
5.7.2
Steady state operation
Burner without modulating operation kit
At the end of the start-up cycle, the servomotor control switches
to TR remote control that controls the pressure or temperature in
the boiler, point C.
(The electric control box carries on checking the presence of the
flame and the correct position of the air and gas maximum
pressure switches).
•
If the temperature or pressure is low (so the TR remote
control is closed), the burner progressively increases the
output up to the MAX value (section C-D).
•
If the temperature or pressure then increases until the TR
opens, the burner progressively decreases its output to the
MIN value (section E-F). And so on.
•
The burner locks out when the heat request is less than the
heat supplied by the burner at MIN output, (section G-H).
The TL remote control opens, the servomotor returns to
angle 0° limited by the contact of cam II (Fig. 28) page 24.
The air damper closes completely to reduce heat losses to a
minimum.
Burner with modulating operation kit
See the manual supplied with the adjuster.
5.7.3
Ignition failure
If the burner does not fire, it goes into lock-out within 3s of the
opening of the gas solenoid valve and 95s s after the closing of
control device TL.
Burner flame goes out during operation
If the flame goes out during operation, the burner will lock out
within 1s.
Fig. 36
M
M
MAX
TL
TR
VR
VS
MIN
0
35
B
0 sec
H
G
F
E
A
C
D
MAX
MIN
0
*
*
35
92
95
92
2
60
77
102
102
92
20190960
M
M
MAX
TL
TR
VR
VS
MIN
0
0 sec
MAX
MIN
0
2
60
92
92
77
35
*
*
95
95
35
Fig. 37
20190961
Содержание 20190698
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