Program Of The Control And Safety Unit - Cuenod C 285 Operating Instructions Manual

Start-up
LFL 1.333 control unit program (AGP)
LFL 1.333 control unit program (AGP)
t1 : Pre ventilation time
t2 : 1st safety time
t3 : Pre-ignition time
- Safety time following
flame disappearance
Safety unit operation
The control and safety unit LAL 2.25 is
designed for intermittent service,
(limiting it to twenty-four hours of
continued use).
For convenience sake, the function
diagram does not include all electrical
components.
It is assumed that :
- Power supply is compliant
- Pressure switches and servomotor
cams have been preset correctly.
Commands from
control and safety unit
Required input signals
Terminal numbers are those shown on
the control and safety unit base.
Each unit program sequence is shown
by a visible symbol on the rotating disk,
near reset button.
Program operating sequences :
30s
3s Motor switched on (terminal 6)
6s when :
- main voltage is applied to
< 1s terminal 1,
- air flap is closed : voltage at
terminal 11 is applied to
terminal 8,
- air pressure switch is off : voltage
at terminal 12 is applied to
terminal 4,
- limit and safety thermostats and
min. gas pressure switch are off:
voltage at terminal 4 is applied to
terminal 5.
Servomotor control (cam I) is wide
open (terminal 9) and opening
confirmed (terminal 8) : start of
pre ventilation.
Start of permanent air pressure
monitoring by air pressure switch
and confirmation at terminal 14.
Circuit broken between terminals 4
and 13.
Servomotor control (cam III) in
ignition position (terminal 10) and
position confirmed (terminal 8).
Start of pre-ignition (terminal 16)
Simultaneous opening of safety
valve and main valve (terminal 18)
: start of safety time.
Start of continuous monitoring of flame
presence.
05/2008 - Art. Nr. 13 013 503D
Ignition transformer off, shortly
followed by end of safety time.
Power regulation enable
(terminal 20) :
Burner stoppage via limit
thermostat cutoff, then servomotor
control off (cam II).
Important :
in continual functioning, a
thermostatic cut-out is obligatory
after twenty-four hours.
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