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172 435 80 08-01
ELECTRIC EQUIPMENT
2(2)
List of components LGB22/LMG22/LME22 (BG550/BG650) 2-Stage
A1 Gas burner control S7 Main switch 3-phase
B1 Ionization electrode S8 Air pressure switch
F1 Operation fuse S20 Main switch 1-phase
F2 Operation fuse T1 Ignition transformer
H1 Lamp, low capacity X1 Connection terminal board
H2 Lamp, high capacity X2 Earth terminal
(optional) X3 Plug-in contact, burner
K1 Motor contactor with thermal X4 Plug-in contact, boiler
overload protector X5 Plug-in contact, stage 2,
M1 Burner motor burner
M2 Damper motor, X6 Plug-in contact, stage 2, boiler
L&S SQN75.624.A21B X7 Plug-in contact, 3-phase,
S1 Operating switch burner
S2 Operating switch, stage 2 X8 Plug-in contact, 3-phase,
S3 Control thermostat boiler
S4 Temperature limiter S9 Gas pressure switch
S5 Micro switch for hinged door Y1 Gas solenoid valve 1
S6 Control thermostat, stage 2 Y2 Gas solenoid valve 2
If S6 is missing, connection between T6 and T8.
Mains connection and fuse in accordance with local regulations.
Function LGB22/LMG22/LME22
1.Operating switch ON-Thermostat ON-Gas pressure switch ON-Air
damper closed.
A control is made that the air pressure switch does not indicate fan pressure.
Then the burner motor starts.
2.Air damper motor opens.
The air damper motor opens the damper to full load. A control is made that
the air pressure switch indicates sufficient fan pressure.
3.Air damper motor closes.
The air damper motor closes to low load . Then the ignition spark is formed.
4.Main and safety valves open
The gas is ignited. The ionization electrode indicates a flame.
5.The safety time expires.
The ignition spark goes out. The safety time expires. If there is no flame or
if for some reason the flame disappears after this time limit, the burner
control locks out.
6.Operating position.
The burner is in operating position and can now change over to full load if the
operating switch and the thermostat for full load are in positon ON. The
burner can alternate between full and low load depending on set temperature.
7.Stop.
The operation of the burner can now be interrupted by means of the operating
switch or the thermostat.
The control locks out. The red lamp in the control is lit. Restart the burner by pressing the reset button.
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