41
0306 / 13 013 497A
LFL 1.333 (AGP) Control and safety
unit program
t1 : Preventilation time 30s
t2 : 1st safety time 3s
t3 : Pre-ignition time 6s
- Safety time following
flame disappearance < 1s
How unit works
The control and safety unit LFL… is
designed for intermittent service,
(limiting it to twenty-four hours).
For convenience’s 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.
Program operating sequences:
w
Motor switched on (terminal 6)
when:
–
main voltage is applied to
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.
x
Servomotor control (cam I) is wide
open (terminal 9) and opening
confirmed (terminal 8): start of
preventilation.
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.
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).
Important
In continual functioning a thermostatic
cut-out is obligatory after twenty-four
hours.
Start up
Safety unit LFL 1.333 (AGP) program
EN
To Next Page
Loading...
