15
Disconnect the unit from power supply prior to any electric installation operations.
Installation shall only be performed by a professional electrician. The rated electrical
parameters are stated on the rating plate. Any tampering with the internal connections
is prohibited and will void the warranty.
The unit is rated for connection to AC single-phase 230 V / 50/60 Hz power mains.
The electric connection must be performed using durable, insulated and heat-resistant
conductors (cables and wires) with minimum cross section 2.5 mm2.
The given conductor section value is tentative. In practice the cable core selection shall be
based on the maximum permissible wire heating depending on the wire type, its insulation,
length and installation method (i.e. overhead, in pipes or inside the walls).
Connect the unit to power supply on the terminal block located in the terminal box on the unit
side wall, in compliance with the wiring diagram and terminal designation in Fig. 7.
Route the cables to the terminal block in the terminal box on the unit side wall through
the electric lead-in to preserve the electrical protection class.
The external power input (230 V / 50/60 Hz) must be equipped with an automatic
thermal-magnetic circuit breaker built into the stationary wiring to disconnect all the
power mains phases.
The mounting place of the automatic circuit breaker QF must ensure prompt access
for emergency shutdown of the unit.
The trip current of the circuit breaker must match the unit consumption current.
Recommended circuit breaker trip current.
16 A (for VUT 300-1 EH EC and VUT 300-2 EH EC)
25 A (for VUT 400 EH EC and VUT 600 EH EC).
VUT EH EC
VUT EH EC
CONNECTION
TO POWER
MAINS