ELECTRIC EQUIPMENT
Oil burner control: LMO24.255
List of components
A1 Oil burner control
B1 Photoresistor
F1 Fuse
H1 Lamp, low capacity
H3 Lamp, lock-out signal 230 V
K1 Thermal overload protection
M1 Burner motor
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
capacity
S7 Main switch
T1 Ignition transformer
X1 Connection terminal board
X2 Earth terminal
X3 Plug-in contact "Euro", burner
X4 Plug-in contact "Euro", boiler
X5 Plug-in contact "Euro",
high/low burner
X6 Plug-in contact "Euro",
high/low boiler
Y1 Solenoid valve 1
Y2 Solenoid valve 2
Y2H Solenoid valve, Hydraulic piston
(Only 2-stage burners with
1 nozzle.)
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
The burner motor starts, an ignition spark is formed, 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 flame.
3. The safety time expires
a. If no flame is established before this time limit the control cuts out.
b. If for some reasons the flame disappears after this time limit, the burner
will make an attempt to re-start.
4. Full load thermostat ON
The burner is in operating position and can now change between high
and low capacity.
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 fulfilled.
The oil burner control cuts out
A red lamp in the control is lit. Press the reset button and the burner
re-starts.
Technical data
Pre-ignition time:
25 s
Pre-purge time:
26 s
Post-ignition time:
5 s
Safety lock-out time:
< 5 s
Reset time after lockout:
< 1 s
Reaction time on flame failure:
< 1 s
Ambient temperature:
from - 20 to +60°C
Min. current with flame established:
45µ A
Max. photo current at start:
5,5µ A
Enclosure:
IP 40
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 26 15-01
2(3)
Max loading K1
Connection A1,A2 / 95, 96 / 97, 98
Max 0,2A/15W
