30
Connection diagram and internal diagram
LMO14
LMO24-LMO44
Control sequence
LMO14
LMO24-LMO44
Key
AL Alarm
device
kbr...
Cable link (required only when no oil pre-heater
is used)
BV... Fuel
valve
EK1
Lock-out reset button
EK2
Remote lock-out reset button
FS Flame signal
FSV
Flame signal amplifier
K... Contacts of control relay
LED
3-colour signal lamps
M Burner
motor
OW Release contact of oil pre-heater
t1 Pre-purge
time
t3 Pre-ignition
time
t3n Post-ignition time
A´ Beginning of start-up sequence with burners using an oil
pre-heater
A Beginning of start-up sequence with burners using no oil
pre-heater
Controller output signal
Required input signals
OH Oil pre-heater
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
t4 Interval from flame signal to release «BV2»
TSA
Ignition safety time
tw Waiting time for oil pre-heating
B Time of flame establishment
C Operating
position
D Controlled shut-down by «R»
µC1 Microcontroller
1
µC2 Microcontroller
2
General unit data
Mains voltage AC 230 V +10 % / -15 %
AC 120 V +10 % / -15 %
Mains frequency
50...60 Hz ±6 %
External primary fuse (Si)
6.3A (slow)
Power consumption
12 VA
Mounting orientation
optional
Weight
approx. 200 g
Degree of protection
IP40 (to be ensured through mounting)
Perm. cable lengths
max. 3m at line capacitance of 100
pF/m
Detector cable laid separately
10 m
Remote reset laid separately
20m
LMO14 LMO24 LMO44
Terminal 1
5 A
5 A
5 A
Terminals 3 and 8
3 A
5 A
5 A
Terminals 4, 5 and 10 1 A
1 A
1A
Terminals 6
1 A
1 A
2A
Flame supervision with QRB and QRC
QRB QRC
Min. detector current required (with flame)
45 µA
70 µA
Min detector current permitted (without flame)
5.5 µA
5.5 µA
Max. possible with flame (tipically)
100 µA 100 µA