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Times Legend
time (50 Hz) in seconds
31.5 t1 Pre-ventilation time with
air damper open
3
t2 Safety time
-
t2' Safety time or safety time
with burners that use pilot
burners
6
t3 Short pre-ignition time
(ignition transformer on
terminal 16)
-
t3' Long pre-ignition time
(ignition transformer on
terminal 15)
12 t4 Time between beginning
of t2' and valve consen-
sus on terminal 19 with t2
-
t4' Time between beginning
of t2' and valve consen-
sus on terminal 19
12 t5 Time between end of t4
and consensus at power
regulator or at valve on
terminal 20
18 t6 Post-ventilation time (with
M2)
3
t7 Time between consensus
for start-up and voltage at
terminal 7 (start delay for
fan motor M2)
72 t8 Start-up duration (without
t11 and t12)
3
t9 Second safety time for
burners that use pilot bur-
ners
12 t10 Time from start-up to
beginning of air pressure
control without air damper
travel time
t11 Air damper opening travel
time
t12 Air damper in flow flame
position (MIN) travel time
18 t13 Permitted post-combu-
stion time
6
t16 Initial delay of consensus
for air damper OPENING
27 t20 Time up to automatic closu-
re of programmer mechani-
sm after burner start-up
NOTE:
With voltages at 60 Hz, the times
are reduced by about 20%.
t2', t3', t3':
These times are valid only for
series 01 or LFL1.335, LFL1.635,
LFL1.638 burner control and com-
mand equipment.
They are not valid for types of
Series 032, since they involve si-
multaneous activation of cams
X and VIII.
Working
The above diagrams illustrate
both the connection circuit and
the sequencer mechanism control
program.
A
Consensus for start-up by
means of installation thermo-
stat or pressure switch "R".
A-B Start-up program
B-C Normal burner operation (on
the basis of "LR" power regu-
lator control commands)
C
Stop controlled by "R"
C-D Return of programmer to
start-up position "A", post-
ventilation. During periods of
inactivity of the burner, only
the command outputs 11 and
12 are powered, and the air
damper is in the CLOSED
position, determined by limit
switch "z" of the air damper
servo motor. During the probe
test and false flame test, the
flame supervision test is also
powered (terminals 22/23 and
22/24).
58 / 112
0006081054_200810
Safety standards
•
In association with the use of
QRA..., earthing of terminal
22 is compulsory.
•
The power cables must con-
form to existing national and
local standards.
•
LFL1... is a safety device,
and it is therefore forbidden to
open it, tamper with it or modi-
fy it!
•
The LFL1... device must be
completely insulated from the
mains before carrying out any
operations on it!
•
Check all the safety functions
before activating the unit or
after replacing a fuse!
•
Provide protection against
electric shock on the unit and
all electric connections. This
is ensured by following the as-
sembly instructions correctly!
•
During operation and mainte-
nance, prevent infiltration of
condensate into the command
and control equipment.
•
Electromagnetic discharges
must be checked on the appli-
cation plan.
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