Device for filling vehicle air conditioning systems with refrigerant R744

An apparatus for filling an automobile air conditioning system with R744 refrigerant in a liquid state via a service port of the air conditioning system, the apparatus comprising:

• a storage tank containing the R744 refrigerant in a liquid state;
• a pump fluidly connected to the storage tank at a low pressure side of the pump and fluidly connected to a first end of a refrigerant supply line at a high pressure side of the pump, wherein the refrigerant supply line carries the R744 refrigerant in the liquid state at a pressure;
• a refrigerant filling station comprising:
• an inlet fluidly connected to a second end of the refrigerant supply line;
• a first outlet fluidly connected to a first end of a first refrigerant return line, wherein the refrigerant return line includes a second end fluidly connected to the storage tank;
• a second outlet fluidly connected to an adapter;
• a valve fluidly connected to the inlet and the first outlet;
• and
• a temperature sensor operable to measure a temperature of the R744 refrigerant at the inlet;
• wherein when a temperature of the R744 refrigerant measured by the temperature sensor is greater than a threshold temperature, the valve is in a first position wherein the valve opens the first outlet and fluidly connects the inlet to the first outlet such that the refrigerant supply line is fluidly connected to the first refrigerant return line;
• and
• wherein when a temperature measured by the temperature sensor is less than a threshold temperature, the valve is in a second position wherein the valve closes the first outlet;
• and
• wherein, in an operating position, the adapter is configured to be fluidly connected to the service port of the air conditioning system and direct the R744 refrigerant to the air conditioning system;
• an adapter support comprising a connection port;
• and
• wherein, in a storage position, the adapter is fluidly connected and sealed to the connection port of the adapter support and directs the R744 refrigerant to the adapter support.