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AHRI: AHRI White Paper On Avoiding Contaminated Refrigerants
Air-Conditioning, Heating, and Refrigeration Institute white paper Reports of R-134a Contaminated with R-40 and Other Refrigerants assists contractors and others in the industry in identifying and avoiding counterfeit refrigerants. Recently, batches of R-134a, R-22, R-404A, and R-410A have been found to be counterfeit, and in some instances badly contaminated with other refrigerants, such as R-40. This increases the risk of explosion. (PDF)

Energy Vanguard: HVAC Secret On Air Conditioner Refrigerant Loophole
Energy Vanguard describes a dirty little secret of the EPA and the HVAC industry. As long as manufacturers ship the units dry, they continue to make and sell air conditioners and heat pumps designed to use R-22.

NIST: Screening Method Identifies 1,200 Candidate Refrigerants To Combat Global Warming
Researchers at the National Institute of Standards and Technology have developed a new computational method for identifying candidate refrigerant fluids with low global warming potential (GWP) as well as other desirable performance and safety features. The new method was used to identify about 1,200 low-GWP chemicals for further study among some 56,000 that were considered.

US DOE: Phase Out of Climate-Harming Refrigerants Offers
US Department of Energy says there is opportunity for innovation now that the global community will avoid rampant growth of HFC refrigerant emissions and phase out their usage over time, replacing them with climate-friendly, energy-efficient alternatives.
Procedures

US DOE: Detection & Repair Of A/C Refrigerant Charge
US Department of Energy report HVAC Fault Detection, Diagnosis, and Repair/Replacement investigates the role that measurement uncertainty can have on refrigerant charge verification. There is a large missed opportunity in underperforming residential air conditioning systems and trained home performance contractors may have skills to diagnose and, in some cases, correct major defects. (PDF)
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