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General unit data
Mains voltage
Mains frequency
External primary fuse (Si)
Power consumption
Mounting orientation
Weight
Degree of protection
Perm. cable lengths
Detector cable laid separately 10 m
Remote reset laid separately
Terminal 1
Terminals 3 and 8
Terminals 4, 5 and 10
Terminals 6
Flame supervision with QRB and QRC
Min. detector current required (with flame)
Min detector current permitted (without flame)
Max. possible with flame (tipically)
Measurement circuit for detector current
12
11
7130v01/0700
bl
sw
+
µA DC
QRB...
Key
µA DC
bl
sw
br
SIEMENS OIL BURNERS AUTOMATIC CONTROLLER SIEMENS
LMO14 - LMO24 - LMO44
The LMO... burner controls are designed for the start-up and supervision
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 detec-
tors, 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 minutes,
the burner control will initiate lock-out.
Controlled intermittent operation
After no more than 24 hours of continuous operation, the burner control
will initiate an automatic safety shut-down followed by a restart.
AC 230 V +10 % / -15 %
AC 120 V +10 % / -15 %
50...60 Hz ±6 %
6.3A (slow)
12 VA
optional
approx. 200 g
IP40 (to be ensured through mounting)
max. 3m at line capacitance of 100 pF/m
20m
LMO14
LMO24
5 A
5 A
3 A
5 A
1 A
1 A
1 A
1 A
QRB
QRC
45 µA 70 µA
5.5 µA 5.5 µA
100 µA 100 µA
LMO...
11
12
1
br
sw
bl
+
µA DC
QRC1...
DC microamperometer with an internal
W
resistance of 5 k
max.
Blue
Black
Brown
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).
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
LMO44
«TSA»
5 A
5 A
In the event the flame is lost during
1A
operation
2A
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 maintai-
ned 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
second (< 3 seconds).
LMO...
Ignition program with LMO24.113A2
7130v02/0700
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 burner will
initiate lock-out. The repetition count is restarted each time controlled
switching on by «R-W-SB» takes place.
Operation
Lock-out reset button «EK...» is the key operating element for
resetting the burner control and for activating / deactivating the
EK
diagnostic functions.
The multicolour «LED» is the key indicating element for both
visual diagnosis and interface diagnosis.
s
Red
l
Yellow
o
Green
Status
Oil pre-heater heats,
waiting time «tw»
Ignition phase, ignition
controlled
Operation, flame o.k.
Operation, flame not o.k. omomomomomo
Undervoltage
Fault, alarm
Output of fault code (refer
to Fault code table)
Extraneous light prior to
burner start-up
Interface diagnosis
Key
m
Off
l
Yellow
o
Green
s
Red
Cause
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 for about 1
Colour code table
Colour code
lllllllllll
lmlmlmlmlml
oooooooooooo
lslslslslsl
sssssssssss
smsmsmsmsm
osososososo
ssssssssssssss
Response
Colour
Yellow
Yellow-off
Green
Green-off
Yellow-red
Red
Red-off
Green-red
Red flicker light
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