Recovery devices.
Which of the following best describes low loss fittings on refrigerant recovery devices used to recover CFCs, HCFCs, and HFCs? A) They can be either manually closed or automatically closed when disconnected to prevent loss of refrigerant from hoses. B) They are used to connect the recovery device to an appliance and leak only small amounts of refrigerant during use. C) They are used to connect the recovery device to an appliance and must be discarded after each use. D) They eliminate oil loss during recovery. For which of the following refrigeration systems/appliances would it be permissible to use a passive recovery device for recovery of CFCs, HCFCs, and HFCs? A) A centrifugal air conditioner B) A reciprocating liquid chiller C) A single compressor, large commercial walk-in freezer D) A domestic refrigerator Who must certify recovery equipment used during maintenance, service or repair of small appliances that use CFCs, HCFCs, and HFCs? A) An ASHRAE-approved laboratory. B) Recovery equipment for small appliances does not require approval. C) An AHRI 740 standards laboratory. D) An EPA-approved laboratory. Which of the following refrigerants is very high pressure and generally does NOT need to be recovered? A) R-22 B) R-134a C) R-404A D) R-744
