20093868
58
GB
Start-up, calibration and operation of the burner
6.6
Switching off the burner
Turn the “
ON/OFF
” switch to “
OFF
” (Fig. 168 on page 55).
Disable the electrical supply. If the burner is off for long periods,
close the manual gas gates.
6.7
Load controller inputs
Selecting the default output analogue source/phases input
with 3 positions (P654)
The following input signals can be selected and managed using the
parameter P654.
•
3 positions phase input (ASZxx.3x feedback potentiometer
necessary/depending on the sequence of the program)
•
0...10 V
•
0...135
•
0...20mA
•
4...20 mA with lockout at I <4 mA (AZL2...: Loc: 60)
NOTE:
For the connections, see the wiring diagrams.
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 element
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 gen-
erator, consequently eliminating the possible problem of poor com-
bustion.
The flame's structure means that smaller combustion chambers
can be developed, designed to exploit this particular feature.
WARNING
Turning the “ON/OFF” switch to “OFF” position dur-
ing the burner post-ventilation phase, the equip-
ment shuts down after a few seconds (ERROR
LOC:83).
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 delivery
at the minimum.
