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172 435 43 08-02
ELECTRIC EQUIPMENT
2(2)
List of components LMG22/LME22 (BG550/BG550LN/BG650) Modulating
A1 Gas burner control S12 Change-over switch, Increase-
A2 Power control Reduce
A3 Valve, leak tester, S15 Control thermostat, 3-pole
Dungs VPS 504 (only for 2-stage sliding)
B1 Ionization electrode S20 Main switch 1-phase
F1 Operation fuse T1 Ignition transformer
F2 Operation fuse X1 Connection terminal board
F3 Operation fuse X2 Earth terminal
H1 Operating lamp X3 Plug-in contact, burner
K1 Motor contactor with thermal X4 Plug-in contact, boiler
overload protector X7 Plug-in contact, 3-phase,
M1 Burner motor burner
M2 Damper motor, X8 Plug-in contact, 3-phase,
L&S SQN75.624.A21B boiler
S1 Operating switch X15 Plug-in contact, power
S3 Control thermostat controller, burner
S4 Temperature limiter X16 Plug-in contact, power
S5 Micro switch for hinged door controller
S7 Main switch 3-phase S9 Gas pressure switch
S8 Air pressure switch Y1 Gas solenoid valve 1
S11 Change-over switch, Aut.-man. Y3 Safety solenoid valve
Mains connection and fuse in accordance with local regulations.
Function 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 max. position. A control is made
that the air pressure switch indicates sufficient fan pressure.
3.Air damper motor closes.
The air damper motor closes to min. load position. 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 the capacity
controlled by the regulator.
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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