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LANDIS OIL BURNERS AUTOMATIC CONTROLLER LMO24 -
LMO44
The LMO... burner controls are designed for the start-up and supervi-
sion of single- or 2-stage forced draught oil burners in intermittent
operation. Yellow-burning flames are supervised with photoresistive
detectors QRB..., blue-burning flames with blue-flame detectors
QRC...
In terms of housing dimensions, electrical connections and flame
detectors, the LMO... are identical to the LOA... oil burner controls.
Preconditions for startup
Burner control is reset
All contacts in the line are closed
No undervoltage
Flame detector is darkened, no extraneous light
Undervoltage
Safety shut-down in the operating position takes place should the
mains voltage drop below about AC 165 V
Restart is initiated when the mains voltage exceeds about
AC 175 V
Time supervision oil pre-heater
If the oil pre-heater's release contact does not close within 10 minu-
tes, the burner control will initiate lock-out.
Controlled intermittent operation
After no more than 24 hours of continuous operation, the burner con-
trol will initiate an automatic safety shut-down followed by a restart.
Control sequence in the event of fault
If lock-out occurs, the outputs for the fuel valves and the ignition will
immediately be deactivated (< 1 second).
Cause
After a mains failure
After voltage has fallen below the
undervoltage threshold
In the event of a premature, faulty
flame signal during «t1»
In the event of a premature, faulty
flame signal during «tw»
If the burner does not ignite during
«TSA»
In the event the flame is lost during
operation
Oil pre-heater's release contact does
not close within 10 min.
Lock-out
In the event of lock-out, the LMO... remains locked (lock-out cannot
be changed), and the red signal lamp will light up. This status is also
maintained in the case of a mains failure.
Resetting the burner
Whenever lock-out occurs, the burner control can immediately be
reset. To do this, keep control
for about 1 second (< 3 seconds).
Ignition program with LMO24.113A2
If the flame is lost during «TSA», the burner will be reignited, but not
later than at the end of «TSAmax.». This means that several ignition
attempts can be made during TSA (refer to «Program sequence»).
Limitation of repetitions
If the flame is lost during operation, a maximum of 3 repetitions can
be made. If the flame is lost for the 4th time during operation, the bur-
ner will initiate lock-out. The repetition count is restarted each time
controlled switching on by «R-W-SB» takes place.
Response
Restart
Restart
Lock-out at the end of «t1»
Prevention of start-up, lock-
out after no more than 40
seconds
Lock-out at the end of TSA
Max. 3 repetitions, followed
by lock-out
Lock-out
the lock-out reset button depressed
APPENDIX: COMPONENTS CHARACTERISTICS
Operation
Lock-out reset button «EK...» is the key operating element for
resetting the burner control and for activating / deactivating
EK
the diagnostic functions.
The multicolour «LED» is the key indicating element for both
visual diagnosis and interface diagnosis.
▲
Red
●
Yellow
❏
Green
Colour code table
Status
Colour code
Oil pre-heater heats,
●●●●●●●●●●●
waiting time «tw»
Ignition phase, ignition
●❍●❍●❍●❍●❍●
controlled
❏❏❏❏❏❏❏❏❏❏❏❏
Operation, flame o.k.
Operation, flame not o.k. ❏❍❏❍❏❍❏❍❏❍❏
●▲●▲●▲●▲●▲●
Undervoltage
▲▲▲▲▲▲▲▲▲▲▲
Fault, alarm
Output of fault code (refer
▲❍▲❍▲❍▲❍▲❍
to Fault code table)
Extraneous light prior to
❏▲❏▲❏▲❏▲❏▲❏
burner start-up
▲▲▲▲▲▲▲▲▲▲▲▲▲▲ Red flicker light
Interface diagnosis
Key
❍
Off
●
Yellow
❏
Green
▲
Red
Diagnosis of cause of fault
After lock-out, the red fault signal lamp remains steady on.
In that condition, the visual diagnosis of the cause of fault according
to the error code table can be activated by pressing the lock-out reset
button for more than 3 seconds.
Error code table
Blink code
2 blinks **
No establishment of flame at the end of TSA
Faulty or soiled fuel valves
Faulty or soiled flame detector
Poor adjustment of burner, no fuel
Faulty ignition
3 blinks ***
Free
4 blinks ****
Extraneous light on burner startup
5 blinks *****
Free
6 blinks ******
Free
7 blinks *******
Too manny losses of fleme during operation
(limitattion og the number of repetitions)
Faulty or soiled fuel valves
Faulty or soiled flame detector
Poor adjustment of burner
8 blinks ********
Time supervision oil pre-heater
9 blinks *********
Free
10 blinks **********
Wiring error or internal error, output contacts
Colour
Yellow
Yellow-off
Green
Green-off
Yellow-red
Red
Red-off
Green-red
Possible cause
27
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