Core Flashcards

Under the Clean Air Act, which substances are technicians prohibited from knowingly venting during the maintenance or disposal of appliances?

Answer: Class I, Class II, and most non-exempt substitute refrigerants such as HFCs

The venting prohibition covers CFCs, HCFCs, and their substitutes including HFCs, with only a few specifically exempted substances.

What does the term 'ozone depletion potential' (ODP) measure?

Answer: A refrigerant's ability to destroy stratospheric ozone relative to CFC-11

ODP compares a substance's ozone-destroying capacity to CFC-11, which has an ODP of 1.0.

Which type of chemical bond in CFC and HCFC molecules is primarily responsible for stratospheric ozone destruction?

Answer: Chlorine atoms released by UV radiation

UV light frees chlorine atoms, which catalytically destroy ozone molecules in the stratosphere.

A technician recovers refrigerant into a recovery cylinder. To what maximum percentage of its rated capacity may the cylinder be filled by weight?

Answer: 80%

Recovery cylinders must not be filled beyond 80% of capacity to leave room for liquid expansion.

Which color marking identifies a Department of Transportation-approved refrigerant recovery cylinder?

Answer: Gray body with a yellow top (shoulder)

Recovery cylinders are marked with a gray body and yellow shoulder to distinguish them from virgin refrigerant cylinders.

Before a recovery cylinder is reused, what must a technician verify regarding its hydrostatic test date?

Answer: It was tested within the last 10 years

DOT-approved cylinders must be hydrostatically retested every five years, and many references cite a re-qualification cycle that must be current within the required interval.

What is the main purpose of recovering refrigerant rather than venting it before servicing a system?

Answer: To comply with the law and prevent release of ozone-depleting and greenhouse gases

Recovery is required by law to keep harmful refrigerants out of the atmosphere.