Function
Siemens LMO24 control and safety unit
Connection diagram and internal diagram LMO24...
µC1
EK1
LED
K1
K3
1
2
10
SB
R
W
AL
Si
L
N
7130a02e/0700
!
Always disconnect the power supply before installing or removing the control unit. Do not attempt to open or carry out repairs
on the control unit.
AL
Alarm device
BV...
Fuel valve
EK1
Lockout reset button
EK2
Remote lockout reset button
FS
Flame signal
FSV
Flame signal amplifier
K...
Contacts of control relay
kbr Cable link (required only
when no oil preheater is used)
LED
3-color signal lamp
M
Burner motor
OW
Release contact of oil preheater
OH
Oil preheater
Status
Waiting time «tw», other waiting states
Oil preheater on, waiting time «tw»
Ignition phase, ignition controlled
Operation, flame o.k.
Operation, flame not o.k.
Extraneous light on burner startup
du bruleur
Undervoltage
Fault, alarm
Error code output (refer to «Error code
table»)
Interface diagnostics
Legend:
420010355104
µC control
µC2
K2
K4
8
3
6
7
4
5
9
kbr
8
3
OW
EK2
OH
BV2
N
Z
BV1
M
QRB... Photoresistive flame detector
QRC... Blue-flame detector
bl = blue, br = brown, sw = black
R
Control thermostat or
pressurestat
SB
Safety limit thermostat
Si
External primary fuse
W
Limit thermostat or pressure
switch
Z
Ignition transformer
TSA
Ignition safety time
tw
Waiting time
Color code table for multicolor signal lamp (LED)
Color code
❍ ...................................................................................
● ...................................................................................
● ❍ ● ❍ ● ❍ ● ❍ ● ❍ ● ❍ ● ❍ ● ❍ ● ❍ ● ❍ ● ❍
❑...................................................................................
❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍
❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲
● ▲ ● ▲ ● ▲ ● ▲ ● ▲ ● ▲ ● ▲ ● ▲ ● ▲ ● ▲ ● ▲
▲...................................................................................
▲ ❍
▲ ❍
▲
▲
▲
....... Steady on
❍
Off
Control sequence LMO24...
A´
R
W
SB
tw
OH
FSV
OW
M
11
12
BV1
BV2
QRB
Z
FS
QRC
1
bl
sw
Only with LMO24.113B2: re-ignition
br
Z
FS
▲ ❍
▲ ❍
▲ ❍
▲ ❍
▲
▲
▲
▲
▲
▲
▲
▲
Red
●
Yellow
A
B
C
t1´
t1
t4
t3n
t3
TSA
t3n
t3n
7130d03e/1102
t1
Prepurge time
t1´
Purge time
t3
Preignition time
t3n
Postignition time
t4
Interval from flame signal to
release of «BV2»
A´
Start of startup sequence with
burners using an «OH»
A
Start of startup sequence with
burners using no «OH»
B
Time of flame establishment
C
Operating position
D
Controlled shutdown by «R»
Color
Yellow
Flashing yellow
Green
Flashing green
Green-red
Yellow-red
Red
▲ ❍
▲ ❍
Flashing red
▲
▲
Red flicker light
❑
Green
www.ecoflamburners.com
EN
D
1
8
3
3
4
5
6
11
12
6
11
12
Off
9