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CONTROL BOX FOR LFL 1... SERIES 02 GAS BURNERS
t2', t3', t3':
These times are valid only for series 01 or LFL1.335,
LFL1.635, LFL1.638 burner control and command equip-
ment.
They are not valid for types of Series 032, since they involve
simultaneous 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 ther-
mostat or pressure switch "R".
A-B
Start-up program
B-C
Normal burner operation (on the basis of "LR" power
regulator control commands)
C
Stop controlled by "R"
C-D Return of programmer to start-up position "A", post-venti-
lation.
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 (ter-
minals 22/23 and 22/24).
Safety standards
•
In association with the use of QRA..., earthing of terminal
22 is compulsory.
•
The power cables must conform to existing national and
local standards.
•
LFL1... is a safety device, and it is therefore forbidden to
open it, tamper with it or modify 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
assembly instructions correctly!
•
During operation and maintenance, prevent infiltration of
condensate into the command and control equipment.
•
Electromagnetic discharges must be checked on the appli-
cation plan.
Control program in the event of stopping, indicating position
of stop. As a rule, in the event of any kind of stop, the fuel flow
is cut off immediately. At the same time, the programmer remains
immobile, as does the switch position indicator. The symbol visible
on the indicator reading disk indicates the type of fault.
No start-up, because of failure in closing of a contact
or lock-out stop during or at the end of the command
sequence because of external lights (for example: flames
not extinguished, loss at the level of the fuel valve, defects
in the flame control circuit, etc.)
Start-up sequence stops, because the OPEN signal
was not sent to terminal 8 by limit switch contact "a".
Terminals 6, 7 and 15 remain powered until the defect is
eliminated.
P
Lock-out stop, because of lack of air pressure signal.
Any lack of pressure from this moment onwards will
cause a lock-out stop!
Lock-out stop because of flame detection circuit malfun-
ction.
Start-up sequence stops, because the position signal
for low flame was not sent to terminal 8 by auxiliary switch
"m". Terminals 6, 7 and 15 remain powered until the fault
is eliminated.
1
Lock-out stop, due to lack of flame signal at the end of
the first safety time.
2
Lock-out stop, because no flame signal was received at
the end of the second safety time (main lame signal with
pilot burners at intermittent operation).
Lock-out stop, due to lack of flame signal during burner
operation.
If a lock-out stop occurs at any moment between the start
and pre-ignition without a symbol, the cause is generally to
be attributed to a premature or abnormal flame signal cau-
sed, for example, by self-ignition of a UV tube.
Stop indications
a-b
Start-up program
b-b'
"Trips" (without contact confirmation)
b(b')-a Post-ventilation program
LFL ..., Series 01
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LFL ..., Series 02
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