05/2009 - Art. Nr. 4200 1017 4400A
14
Commissioning
Program of the LFL 1.333 (VARIO) control unit
Program of LFL 1.333 (VARIO) control
unit
t1:preventilation time 30s
t2:1st safety time 3s
t3:pre-ignition 6s
- :safety time on
flame extinguishing< 1s
Electrical operation
The LFL... control and safety unit is
designed for intermittent service, limited
to twenty-four hours of continued use.
For reasons of clarity, not all electrical
components are included in the
schematic diagram.
It is assumed that:
- the power supply is compliant.
- the servomotor pressure switches and
cams have been pre-set correctly.
Commands from control and safety unit.
Required input signals.
The terminal numbers
are those marked on
the base of the control
and safety unit.
Each phase of the control unit’s program
is identifiable by a symbol visible on a
rotating disc near to the reset button.
Program operating sequences:
Motor powered up (terminal 6) if
- mains voltage is supplied to
terminal 1,
- the air flap is closed: the voltage
on terminal 11 switches to
terminal 8,
- the air pressure regulator is at
rest: the voltage on terminal 12
switches to terminal 4,
- the thermostats (limiter and cut-
out) and the min gas pressure
switch are closed: the voltage on
terminal 4 switches to
terminal 5.
Servomotor control
(cam I) in wide open position
(terminal 9) with confirmation of
opening (terminal 8): start of
preventilation.
Start of permanent air pressure
check by the pressure switch and
confirmation at terminal 14: the
circuit between terminals 4 and 13
is broken.
Servomotor control
(cam III) in ignition position
(terminal 10) and confirmed of
position (terminal 8).
Start of pre-ignition (terminal 16).
Simultaneous opening of the safety
valve and main valve (terminal 18):
start of safety time.
Start of continuous monitoring of flame
presence.
Ignition transformer shutdown
shortly followed by
End of safety time.
Power control enabled (terminal
20).
Burner shut down by cut-off of the
limiter thermostat then servomotor
(cam II) closing position control.
During continuous operation, a
thermostatic cut-off is
obligatory
after twenty-four hours.
Содержание ES08.5200 G/F-VT
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