And Safety Unit - Cuenod C 280 B 517/8 Manual De Utilización

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
How unit works
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.
Control signals from
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.
40
Program operating sequences :
w Motor switched on (terminal 6)
30s
3s
when :
6s
–
main voltage is applied to
terminal 1,
< 1s
–
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.
x Servomotor control (cam I) is
wide open (terminal 9) and
opening confirmed (terminal 8) :
start of pre ventilation.
r Start of permanent air pressure
monitoring by air pressure
switch and confirmation at
terminal 14. Circuit broken
between terminals 4 and 13.
v Servomotor control (cam III) in
ignition position (terminal 10)
and position confirmed
(terminal 8).
A Start of pre-ignition
(terminal 16)
B Simultaneous opening of safety
valve and main valve
(terminal 18) : start of safety
time.
Start of continuous monitoring of
flame presence.
11/2003 - Art. Nr. 13 013 506A
y Ignition transformer off, shortly
followed by end of safety time.
s Power regulation enable
(terminal 20) :
t Burner stoppage via limit
thermostat cutoff, then
servomotor control off (cam II).
Mandatory :
in continual functioning, a
thermostatic cut-out is obligatory
after twenty-four hours..