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0006081053 - ed 2006/12
C
od
.0
00
29
35
08
0
Remarks:
Before turning the
adjusting screw, loosen the lock nut
and after completing the adjustment,
tighten it up again.
8) Now connect the burner again; it
will start and automatically switch
to the 2nd fl ame according to the
present program.
9) With the burner operating with
the 2nd fl ame, adjust the amount
of air necessary to ensure an
efficient combustion with the
screw mentioned under item 7.
Combustion test should be made
using appropriate instruments.
Make the regulation so as to
obtain a certain amount of carbon
dioxide (CO
2
) in the smoke,
varying from min. 10% to max.
13% with a smoke number not
exceeding 2 (Bacharach scale).
CHECKS
After starting up the burner, check
the safety devices (photoresistance,
block, thermostats).
1) The photocell is the fl ame control
device and so it should trip if
the fl ame extinguishes during
operation (this check should
be made after at least 1 minute
from lighting up).
2) The burner should be capable
of blocking itself and remain so
when a normal fl ame does not
come on during start-up cycle and
within the preset on control box.
The “lock-out” causes the
motor and the burner to stop
immediately and corresponding
“lock-out” warning lamp lights
up.To check the function
photoresistant-cell and lock-out
system proceed as follows:
a) Start up the burner.
b) After at least one minute, remove
the photo-cell from its seat
and pull it out and simulate
fl ame failure by covering the
photo-cell (use a rag to close
the window in the photocell
support).The burner flame
should go to lock-out.
c) Keep the photo-cell in the dark
and the burner will start again,
but the photo-cell does see the
light and the burner goes to
lock-out within the time preset
by control box. The control box
can be reset only manually by
pressing the appropriate push-
button.
3) To check the thermostat
effi ciency, run the burner until
the water in the boiler reaches a
temperature of at least 50 °c and
then turn the thermostat control
knob to reduce the temperature
until an opening click is heard
and simultaneous stopping of
the burner. The thermostat
should trip within a maximum
tolerance of 5 to 10 °C in respect
to the control thermometer
(boiler thermometer); if not,
change the setting on the
thermostat scale to match that
of the thermometer.
Legenda:
A - Cap
B - 1
st
fl ame adjusting screw
C - Lock nut
D - 2
nd
fl ame adjusting screw
E - Lock nut
F - Air regulation shutter
G - Air inlet
