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172 435 83 05-01
ELECTRIC EQUIPMENT
2(2)
List of components LFL1... (BG550/BG650) 2-Stage
A1 Gas burner control S6 Control thermostat, stage 2
A3 Valve, leak tester, S7 Main switch 3-phase
Dungs VPS 504 S8 Air pressure switch
R1 UV-Detector S10 Gas pressure switch, max
F1 Operation fuse S20 Main switch 1-phase
F2 Operation fuse T1 Ignition transformer
F3 Operation fuse X1 Connection terminal board
H1 Lamp, low capacity X2 Earth terminal
H2 Lamp, high capacity X3 Plug-in contact, burner
(optional) X4 Plug-in contact, boiler
K1 Motor contactor with thermal X5 Plug-in contact, stage 2,
overload protector burner
K2 Auxiliary relay X6 Plug-in contact, stage 2, boiler
M1 Burner motor X7 Plug-in contact, 3-phase,
M2 Damper motor, burner
L&S SQN75.294A21B X8 Plug-in contact, 3-phase,
S1 Operating switch boiler
S2 Operating switch, stage 2 S9 Gas pressure switch
S3 Control thermostat Y1 Gas solenoid valve 1
S4 Temperature limiter Y2 Gas solenoid valve 2
S5 Micro switch for hinged door Y3 Safety solenoid valve
If S6 is missing, connection between T6 and T8.
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 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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