ELECTRIC EQUIPMENT
Oil burner control: LMO24.../LOA2...
List of components
A1 Oil burner control
B1 Photoresistor
F1 Fuse
H1 Lamp, low capacity
H2 Lamp, high capacity
H3 Lamp, lock-out signal 230 V
K1 Thermal overload protection
M1 Burner motor
M2 Damper motor SQN75.244A21B
P1 Time meter, low capacity
(optional)
P2 Time meter, high capacity
(optional)
S1 Operating switch
S2 Operating switch, high/low
capacity
S3 Control thermostat
S4 Temperature limiter
S5 Micro switch for hinged door
S6 Control thermostat, high/low
S7 Main switch
T1 Ignition transformer
X1 Connection terminal board
X2 Earth terminal
X3 Plug-in contact, burner
X4 Plug-in contact, boiler
X5 Plug-in contact
high/low capacity burner
X6 Plug-in contact
high/low capacity boiler
Y1 Solenoid valve 1
Y2 Solenoid valve 2
If S6 is missing connection between T6 and T8.
Mains connection and fuse in accordance with local regulations.
Function
1. Switch on operating switch and twin thermostat
A spark is formed. The air damper motor opens the damper to low load
position. The burner motor starts, the prepurge goes on till the prepurge
period expires and the solenoid valve 1 opens (2).
2. Solenoid valve 1 opens
Oil mist is formed and ignited. The photocell indicates a lame.
3. The safety time expires
a. If no lame is established before this time limit the control cuts out.
b. If for some reasons the lame disappears after this time limit, the burner
will make an attempt to re-start.
4. High/Low thermostat ON
The burner is in operating position and can now change between full load
and low load.
4-5. Operating position
If the burner operation is interrupted by means of the main switch or the
thermostat, a new start takes place when the conditions in accordance
with point 1 are fulilled.
The oil burner control cuts out
A red lamp in the control is lit. Press the reset button and the burner
re-starts.
LMO24...
LOA24...
LOA21...
Pre-ignition time:
25 s
13 s
13 s
Pre-purge time:
26 s
13 s
13 s
Post-ignition time:
5 s
15 s
15 s
Safety lock-out time:
< 5 s
< 10 s
< 10 s
Reset time after lockout:
< 1 s
< 50 s
< 50 s
Reaction time on lame failure:
< 1 s
< 1 s
< 1 s
Ambient temperature:
-20 - +60°C
-20 - +60°C
-20 - +60°C
Min. current with lame established:
45 µA
65 µA
70 µA
Max. photo current at start:
5,5 µA
5 µA
5,5 µA
Enclosure:
IP 40
IP 40
IP 40
LOA21... not to be used within EU
Control of photo current
Current through photo unit is measured with a d.c. ammeter (a moving coil
instrument connected in series with the photo unit).
171 435 27 15-01
2(3)
Max loading K1
Connection A1,A2 / 95, 96 / 97, 98
Max 0,2A/15W
