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.s <br /> A test which is used by some appliance recyclers to determine type of refrigerant is the <br /> pressure/temperature test. The type of refrigerant is determined by measuring the <br /> pressure within the system and the external atmospheric temperature. There are charts <br /> available which correlate the type of refrigerant to the known pressure and temperature. <br /> This method may result in inaccurate readings because of low system pressures. <br /> Refrigeration or air conditioning units in the recycling and disposal sectors may have <br /> reduced system pressure due to leakages caused during handling or system failure. <br /> Note: The pressure/temperature method does not work well in determining whether a <br /> certain refrigerant and air conditioning unit contains CFC-12 or HFC-134a <br /> because both of these refrigerants operate at similar conditions12. <br /> If the refrigerant type is still unknown, call your refrigerant reclaimer or equipment <br /> manufacturer for further information. One appliance recycler is storing all unknown <br /> refrigerants into a container labeled as "mixed" refrigerants. Although this container <br /> would be managed as hazardous wastes, it would keep from contaminating other loads <br /> of recyclable refrigerants". <br /> 2.3 Refrigerant Extraction Methods <br /> Tools / Equipment Needed <br /> The basic tools and equipment needed for extracting refrigerants are; 1) piercing valve, <br /> 2) recovery or recycling equipment, and 3) storage containers. <br /> The piercing valve is used to puncture the refrigeration coil to allow the transfer of <br /> refrigerant from the air conditioning or refrigeration system to the recovery or recycling <br /> equipment (see Figure 5). <br /> There are two types of equipment that are used to extract refrigerant from appliances; <br /> recovery and recycling. The recovery equipment removes the refrigerant from an <br /> appliance and transfers it to a storage tank without further processing. Two types of <br /> recovery equipment are system-dependent and self-contained. The system dependent <br /> recovery equipment requires the assistance of components contained in an appliance to <br /> remove the refrigerant from the appliance. The self-contained recovery equipment is <br /> capable of removing the refrigerant from an appliance without the assistance of <br /> components contained in the appliance. <br /> Recycling equipment removes the refrigerant from an appliance and then cleans the <br /> refrigerant by oil separation and cycling through one or more filter dryers to remove <br /> moisture, acidity, and particulate matter. The refrigerant is then transferred back into <br /> the appliance or to a storage tank. Recycling equipment would typically be used by <br /> those individuals in the appliance repair sectors because the refrigerant extracted is <br /> typically put back into the appliance after repairs or maintenance operations. <br /> E <br /> 7 <br />