Hot gas defrost is also applied to machines operating at temperatures below 0 ° C and consists of blocking the liquid line and interconnection controlled by a solenoid valve positioned between the compressor discharge and the evaporator inlet just after the valve. of expansion.
While performing this type of defrost the air forcings are switched off and the system compressor is still running to ensure the superheated steam is pumped to the evaporator, so when activated the evaporator will act as a condenser, the fluid to the machine refrigerant when discharged by the compressor under high pressure and temperature is thrown into the evaporator releasing heat to the accumulated ice thus causing it to melt, during this process part of the refrigerant condenses from the evaporator in the liquid phase through the suction line, so it is It is extremely important to apply a correctly sized liquid separator (suction accumulator) to prevent this portion of liquid phase refrigerant from entering the compressor intake chamber causing problems in its operation and even breakage by liquid blow.
