The invention pertains to method and apparatus for servicing refrigeration circuits wherein the refrigerant is removed from the circuit and the circuit recharged. In accord with the invention the recovered refrigerant may be reprocessed for recharging the circuit, or the recovered refrigerant may be stored and fresh refrigerant employed for circuit charging purposes. Further, the invention contemplates the removal of oil from recovered refrigerant, and the charging of a predetermined amount of lubricating oil into the recharged circuit.

Refrigerant recovery and recharging system

The invention pertains to an environmental protection system and method for withdrawing and charging refrigerants, particularly fluorocarbon refrigerants, with respect to refrigeration systems as used for refrigeration, dehumidifying, air conditioning and the like without contamination of the atmosphere. Refrigerant is evacuated from a refrigeration system through a closed circuit into a closed disposal or storage container, and in an embodiment of the invention direct evacuation pumping of the refrigerant may be proceeded by drawing the majority of the refrigerant from the refrigeration system by means of a preliminary vacuum tank connected in series with a refrigerant disposal container. Additionally, the invention contemplates combining a refrigerant charging circuit with the refrigerant evacuation circuit in order to provide complete refrigeration system servicing without the release of refrigerant to the atmosphere.

Environmental protection refrigerant disposal and charging system

An air conditioner charging station includes oil and refrigerant reservoirs, a vacuum pump, and an electronic sequencing unit. A header conduit connected to the reservoirs and vacuum pump is connected to a cross-over conduit, which in turn is connected to conduits extending to the high and low pressure sides of an air conditioner compressor. Electrically operated valves are provided in the cross-over conduit, in a dump conduit connected to the cross-over conduit, and in branch conduits connected to the reservoirs and to the vacuum pump. An over-ride control of the cross-over valve is provided, responsive to the pressure of the high pressure side and an over-ride control is provided for cross-over valve, activated if the ambient temperature is below a predetermined level. An excessively high pressure in the high pressure side causes the closing of the valve in the refrigerant reservoir branch conduit.

Automotive air conditioner charging station with over-ride controls

A low refrigerant charge detecting device comprises a refrigerant superheat temperature transducer that senses refrigerant leaving the evaporator and provides a positional output indicative of the superheat temperature of the sensed refrigerant, an ambient air temperature transducer that senses ambient air and provides a positional output indicative of the ambient air temperature, and a low charge signal effecter that responds to both the positional outputs and provides a low charge signal at predetermined refrigerant superheat and ambient air temperatures.

Low refrigerant charge detecting device

Movable switch elements responsive to temperature and pressure control the operation of a refrigerant charge unit during charging.

Refrigerant charging control unit

A refrigerant charging apparatus for a refrigeration installation having a registration port of the aspiration line and a registration port of the liquid line, said apparatus comprising an electrically controlled intake valve, having an intake port adapted for to be detachably connected to a source of coolant and an evacuation port adapted to be detachably connected to said register port of the suction line, a first pressure transducer adapted to be connected to said port of registration of the line of aspiration to provide an electrical signal as a function of the pressure perceived in the suction pipe, a first temperature transducer adapted to be detachably connected to the suction pipe to provide an electrical signal as a function of the temperature perceived in the pipe of aspiration, an electr circuit ico regulator that responds to the signals of said first transducers of temperature and pressure to effect the opening of said intake valve when there is a predetermined relationship between the temperature and pressure perceived in the suction pipe, a second pressure transducer adapted to be detachably connected to said registration port of the liquid line to provide an electrical signal as a function of the perceived pressure in the liquid line, a second temperature transducer for providing an electric signal as a function of the perceived ambient temperature, and an electrical interlock circuit that responds to the signals of said second pressure and temperature transducers, to prevent said regulator circuit from opening said intake valve upon conditions in predetermined relation between the ambient temperature and the pressure of the liquid pipe, perceived by said seconds temperature and pressure transducers. (Machine-translation by Google Translate, not legally binding)

Electrically controlled refrigerant charging device

Refrigeration system charging apparatus

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Electrically controlled refrigerant charging device

Refrigeration system charging apparatus