C.I.B. UNIGAS
- M039231CB
17
ELECTRICAL CONNECTIONS
Wiring diagram keys on page 38.
Rotation of fan motor
Once the electrical connection of the burner is executed, remember to check the rotation of the fan motor. The motor should rotate
according to the indication on the body. In the event of wrong rotation, reverse the three-phase supply and check again the rotation of
the motor.
NOTE: the burners are supplied for three-phase 400V supply, and in the case of three-phase 230V supply it is necessary to
modify the electrical connections into the terminal box of the electric motor and replace the overload tripped relay.
Note on elecrtical supply
If the power supply to the burner is 230V three-phase or 230V phase-phase (without a neutral), with the Siemens LME2... control box,
between the terminal 2 on the board and the earth terminal, an RC Siemens RC466890660 filter must be inserted.
Key
C - Capacitor (22nF/250V)
LMV - Siemens BMS (Burner Management System)
R - Resistor (1Mohm)
RC466890660 - RC Siemens filter
Fig. 14
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.
ATTENTION: 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.
WARNING: 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.
IMPORTANT: Connecting electrical supply wires to the burner teminal block MA, be sure that the ground wire is
longer than phase and neutral ones.
SIEMENS
LMV2..
X03-4 (N)
