Patent ID: 8740582

Claim:
A maintenance machine for refrigeration units comprising: a compressor driven by a motor, said motor being selectively connected to the compressor or to a vacuum pump to drive either the compressor or the vacuum pump; a first freewheel provided between the motor and the compressor; a second freewheel provided between the motor and the vacuum pump, wherein the rotational direction of the motor is reversible, and the direction of entrainment of the first and the second freewheel are opposite to each other so that the motor drives the compressor in one direction of rotation and drives the vacuum pump in an opposite direction of rotation; and a valve device provided with a first port, said first port being adapted for fluid connection to the inlets of the compressor and the vacuum pump, the valve device having two further external ports adapted to be separately connected to refrigerant lines of a refrigeration unit, said valve device, in a first state thereof, fluidically connecting the first port solely to one of the further ports and, in a second state, fluidically connecting the first port solely to the other of the further ports.