PART I: INSTALLATION MANUAL
7
ELECTRICAL CONNECTIONS
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Remove the front panel of the electrical board on the burner.
Carry out the connections in the power supply electrical board as shown in Fig. 6; verify the fan motor direction and refit the
electrical board front panel.
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For a complete key of electrical diagrams see on page 22.
Fan motor direction
After completing the electrical connection of the burner, remember to check the rotation of the fan motor. The motor should
rotate in an anti-clockwise direction looking at cooling fan. In the event of incorrect rotation reverse the three-phase supply and
check again the rotation of the motor.
ATTENTION: the burners are supplied for three-phase 400 V supply, and in the case of three-phase 230 V supply it is neces-
sary to modify the electrical connections inside the terminal box of the electric motor, replace the thermal overload relay and
modify the resistors connections.
WARNING: The burner is fitted with an electrical bridge between terminals 6 and 7, in the event of connecting the
high/low flame thermostat remove this bridge before connecting the thermostat.
IMPORTANT: In connecting electric supply wires to burner teminal block be sure that ground wire should be longer
than phase and neutral ones.
Fig. 6
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.
Pre-heater resistors
2.4 - 4.5 kW
Electrical motor terminal block
Fig. 7a
Fig. 7b
230V
400V
230V
400V
