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Connection diagram and internal diagram
µC-Steuerung
EK1
µC1
LED
K1
K2
K3
2
10
8
1
kbr
8
SB
OW
W
OH
AL
N
Si
L
N
7138a01/0801
Control sequence
A´
A
B
W
SB
R
tw
OH
OW
t1´
M
t1
BV1
Z
t3
FS
nur bei LMO64.302...: Wiederzündung
t3n
Z
FS
7138d01/0402
Legend
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 oil preheater is not
used)
LED
3-color signal lamps
M
Burner motor
TSA
Ignition safety time
tw
Waiting time
t1
Prepurge time
t1´
Purge time
t3
Preignition time
A´
Beginning of startup sequence with burners using an
oil preheater
A
Beginning of startup sequence with burners using no
oil preheater
B
Time of flame establishment
Control signals
Required input signals
Permissible input signals
Siemens Building Technologies
HVAC Products
LMO64.30...
µC2
3
6
4
5
9
7
3
R
M
Z
BV1
LMO64.30...
C
D
t8
t3n
TSA
t3n
EK1
LED
FSV
K3
2
11
12
1
QRB
SB
EK2
W
QRC
1
bl
sw
Si
L
br
N
7138a02/0502
E
A´
W
1
SB
7
R
tw
8
OH
3
OW
3
M
BV1
4
BV2
6
11
Z
12
FS
6
11
12
LMO64.31...
µC-Steuerung
µC1
µC2
K1
K2
8
3
10
6
7
kbr
8
3
OW
R
OH
AL
N
Z
M
LMO64.31...
A
B
C
t1´
t1
t4
t3n
t3
TSA
7138d02/0402
OW
Release contact of oil preheater
OH
Oil preheater
QRB
Photoresistive 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
t3n
Postignition time
t4
Interval from flame signal
to release «BV2»
t8
Postpurge time
C
Operating position
D
Controlled shutdown by «R»
E
End of startup sequence
µC1
Microcontroller 1
µC2
Microcontroller 2
FSV
4
5
9
11
12
QRB
EK2
BV2
QRC
1
bl
sw
BV1
br
D
E
1
7
8
3
t8
3
4
5
6
11
12
9/10
CC1N7138en
22.07.2002
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