Refrigerant recovery, purification and recharging system

A system for recovering, purifying and recharging refrigerant in a refrigeration system comprising:

• a refrigerant compressor having an input and an output;
• means including evaporator means and a recovery control valve for connecting said compressor input to a refrigeration system from which refrigerant is to be recovered, purified and recharged;
• condenser means coupled to said compressor output in heat exchange relation to said evaporator means for liquifying refrigerant from said compressor output;
• refrigerant storage means having first and second ports;
• means for feeding refrigerant from said condenser means to said first port;
• filter means for removing contaminants from refrigerant passing therethrough;
• means including a circulation valve for selectively circulating refrigerant in a closed path from said second port through said filter means to said first port;
• means for evacuating said refrigeration system including a vacuum valve for selectively connecting said refrigeration system through said evacuating means;
• means including a recharging valve for selectively connecting said second port to said refrigeration system for selectively feeding refrigerant from said storage means to said refrigeration system;
• and means for selectively operating said recovery control valve, said circulation valve, said vacuum valve and said recharging valve for recovering refrigerant from said refrigeration system and storage thereof in said storage means, purification of refrigerant in said storage means by circulation through said filter means, evacuating said refrigeration system, and recharging said refrigeration system with refrigerant from said storage means.

A refrigerant recovery and purification system comprising:

• a refrigerant compressor having an input and an output;
• means including evaporator means for connecting said compressor input to a refrigeration system from which refrigerant is to be recovered;
• condenser means coupled to said compressor output in heat exchange relation to said evaporator means for liquifying refrigerant from said compressor output;
• refrigerant storage means having first and second ports;
• means for feeding liquid refrigerant from said condenser means to said first port;
• filter means for removing water from refrigerant passing therethrough;
• means for selectively circulating refrigerant in a closed path from said second port through said filter means to said first port;
• means for indicating operating condition of said filter means as a function of pressure drop of refrigerant passing through said filter means;
• and means for indicating water concentration of refrigerant exiting said filter means.

A refrigerant recovery and purification system comprising:

• a refrigerant compressor having an input and an output;
• means including evaporator means for connecting said compressor input to a refrigeration system from which refrigerant is to be recovered;
• condenser means coupled to said compressor output in heat exchange relation to said evaporator means for liquifying refrigerant from said compressor output;
• refrigerant storage means having first and second ports;
• means for feeding liquid refrigerant from said condenser means to said first port;
• filter means for removing water from refrigerant passing therethrough;
• means for selectively circulating refrigerant in a closed path from said second port through said filter means to said first port;
• and means for recharging said refrigeration system from refrigerant in said container including:
• means connected to said refrigeration system for evacuating said system following removal of refrigerant therefrom, and means connecting said second port to said refrigeration system for selectively feeding refrigerant from said storage means to said refrigerant system following evacuation thereof by said evacuating means.