Unigas HTP2000 Installation Manual page 23

ELECTRICAL CONNECTIONS
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.
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);
4 refit the panel cover.
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.
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.
CAUTION: check the motor thermal cut-out adjustment
NOTE: the burners are supplied for three-phase 380 V or 400 V supply, and in the case of three-phase 220 V or 230 V 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 control box, between
the terminal 2 (terminal X3-04-4 in case of LMV2x, LMV3x, LMV5x, LME7x) on the board and the earth terminal, an RC Siemens
RC466890660 filter must be inserted.
Key
C - Capacitor (22nF/250V)
LME / LMV - Siemens control box
R - Resistor (1MΩ)
M - Terminal 2 (LGB,LMC,LME), terminal X3-04-4 ( LMV2x,
LMV3x, LMV5, LME7x)
RC466890660 - RC Siemens filter
For LMV5 control box, please refer to the clabeling recommendations avaible on the Siemens CD attached to the burner
LMV2/3.. - LMV5..
M
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PART II: INSTALLATION