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172 435 77 04-01
ELECTRIC EQUIPMENT
2(2)
List of components LFL1... (BG550/BG550LN/BG650) Modulating
A1 Gas burner control S10 Gas pressure switch, max.
A2 Power control S11 Change-over switch, Aut.-man.
A3 Valve, leak tester, S12 Change-over switch, Increase-
Dungs VPS 504 Reduce
B1 Ionization electrode S15 Control thermostat, 3-pole
F1 Operation fuse (only for 2-stage sliding)
F2 Operation fuse S20 Main switch 1-phase
F3 Operation fuse T1 Ignition transformer
H1 Operating lamp 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 X7 Plug-in contact, 3-phase,
K2 Auxiliary relay burner
M1 Burner motor X8 Plug-in contact, 3-phase,
M2 Damper motor, boiler
L&S SQN75.664.A21B X15 Plug-in contact, power
S1 Operating switch controller, burner
S3 Control thermostat X16 Plug-in contact, power
S4 Temperature limiter controller
S5 Micro switch for hinged door S9 Gas pressure switch
S7 Main switch 3-phase Y1 Gas solenoid valve 1
S8 Air pressure switch Y3 Safety solenoid valve
Mains connection and fuse in accordance with local regulations.
Function LFL1...
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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