PART I: INSTALLATION MANUAL
22
threaded gas trains with Multibloc Dungs MBC..SE 1200 or Siemens VGD20..
flanged gas trains with Multibloc Dungs MBC..SE 1900-3100-5000 or Siemens VGD40..
Once the train is installed, connect electrically all its elements: gas valves group, pressure switches, gas proving system.
ELECTRI-
CAL CONNECTIONS
To execute the electrical connections, proceed as follows:
1
remove the cover from the electrical board, unscrewing the fixing screws;
2
execute the electrical connections to the supply terminal board as shown in the attached wiring diagrams;
3
check the direction of the fan motor (see next paragraph);
1
refit the panel cover.
Rotation of electric motor
Once the electrical connection of the burner is executed, remember to check the rotation of the electric motor. The motor should rotate
according to the “arrow” symbol on the body. In the event of wrong rotation, reverse the three-phase supply and check again the rota-
tion of the motor.
NOTE: the burners are supplied for three-phase 380/400/415/480 V supply, and in the case of three-phase 220/230/240 V sup-
ply it is necessary to modify the electrical connections into the terminal box of the electric motor and replace the overload
tripped relay.
Note on electrical supply
In the case where the power supply of the AUXILIARIES of the phase-phase burner (without a neutral), for the flame detection it is
necessary to connect the RC circuit Siemens between the terminal 2 (terminal X3-04-4 in case of LMV2x, LMV3x, LMV5x, LME7x) of
the base and the earth terminal, RC466890660. For LMV5 control box, please refer to the clabeling recommendations avaible on the
Siemens CD attached to the burner
Combustion head gas pressure curves depending on the flow rate
Curves are referred to pressure = 0mbar in the combustion head!
The curves referred to the gas pressure in the combustion head, depending on the gas flow rate, are referred to the burner properly
adjusted (percentage of residual O
2
in the flues as shown in the “Recommended combustion values” table and CO in the standard
limits). During this stage, the combustion head, the gas butterfly valve and the actuator are at the maximum opening. Refer to Fig. 3,
showing the correct way to measure the gas pressure, considering the values of pressure in combustion chamber, surveyed by means
WARNING! Respect the basic safety rules. make sure of the connection to the earthing system. do not reverse
the phase and neutral connections. fit a differential thermal magnet switch adequate for connection to the mains.
WARNING! before executing the electrical connections, pay attention to turn the plant’s switch to OFF and be
sure that the burner’s main switch is in 0 position (OFF) too. Read carefully the chapter “WARNINGS”, and the
“Electrical connections” section.
ATTENTION: Connecting electrical supply wires to the burner teminal block MA, be sure that the ground wire is
longer than phase and neutral ones.
WARNING: (only for double stage and progressive burners) The burner is provided with an electrical bridge
between terminals 6 and 7; when connecting the high/low flame thermostat, remove this bridge before connecting
the thermostat.
CAUTION: check the motor thermal cut-out adjustment
LMV2/3... - LMV5...
M
Key
C - Capacitor (22 nF , 250 V)
LME / LMV - Siemens control box
R - Resistor (1 M
Ω
)
M: Terminal 2 (LGB, LME), Terminal X3-04-4 ( LMV2x, LMV3x,
LMV5, LME7x)
RC466890660 - RC Siemens filter
