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t2´, t3´, t4´:
Such time intervals are valid
only
for burner command and
control equipment of
series 01
, i.e. LFL1.335, LFL1.635,
LFL1.638. They do not apply to burners of the series 02 since
they have a
simultaneous activation of the X and VIII cams
.
Operation
The drawings above show both the connection circuit and the
sequencer mechanism control programme.
A
Start-up confirmation by means of thermostat or the
installation pressure switch “R”.
A-B
Start-up programme
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-
ventilation.
During periods of burner inactivity, only the 11 and 12
control outputs are powered and the air gate is CLOSED
by the “z” limit switch of the relevant servomotor. During
the probe test and the false flame test, also the flame
supervision circuit is powered (terminals 22/23 and
22/24).
Safety standards
· In association with the use of qRA…, grounding 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.
· During use and maintenance, take care to prevent any
infiltration of condensation water on the controls.
· Electromagnetic emissions must be verified during use.
Control programme in case of stopping and indication of
stop position
As a rule, in the event of any kind of stop, the fuel flow is
immediately cut off. At the same time both the programmer and
the switch position indicator remain in the same position. The
symbol on the indicator reading disk indicates the fault type.
No start-up
, due to failure of a contact or lock-out stop to close
during or at the end of the command sequence because of
external lights (for example: flames not extinguished, leak of
the fuel valve, defects in the flame control circuit, etc.)
Start-up sequence stop,
because the OPEN signal was not
sent to terminal 8 by limit switch contact “a”. Terminals 6, 7
and 15 remain live until fault removal!
P Shut-down in lock condition
, due to no air pressure signal.
From this moment on, any missing air pressure indication
triggers a shutdown!
Lock-out stop
due to malfunction of the flame detection
circuit.
Start-up sequence stop
, because the position signal for
low flame was not sent to terminal 8 by auxiliary switch “m”.
Terminals 6, 7 and 15 remain live until fault removal!
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 flame signal with pilot
burners at intermittent operation).
Lock-out stop
, due to lack of flame signal during burner
operation.
If a shutdown occurs between start-up and pre-ignition with no
symbol, usually the cause is a premature flame, i.e. faulty, flame
signal caused for example by the self-ignition of an UV pipe.
Shut-down indications
LFL1..., series 01
LFL1..., series 02
a-b
Start-up programme
b-b’
“Trips” (without contact confirmation)
b(b’)-a
Post-ventilation programme
Summary of Contents for 66875410
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