Refrigerant Properties and Identification Flashcards

What is the ASHRAE/ARI standard cylinder color for R-410A refrigerant?

Answer: Rose (pink)

ASHRAE/ARI assigns rose (pink) as the standard cylinder color for R-410A to distinguish it from other refrigerants during service.

Which refrigerant is classified as an HCFC (hydrochlorofluorocarbon)?

Answer: R-22

R-22 is an HCFC (chlorodifluoromethane) because it contains hydrogen, chlorine, and fluorine; its chlorine content gives it an ODP of 0.055.

What does a refrigerant's 'critical temperature' refer to?

Answer: The temperature above which it cannot be liquefied regardless of pressure

The critical temperature is the point above which a refrigerant exists only as a gas and cannot be liquefied by increasing pressure, defining the upper bound of the two-phase region.

Which of the following refrigerants has the highest ozone depletion potential (ODP)?

Answer: R-12

R-12, a CFC, has an ODP of 1.0 — the reference value — which is higher than R-22's ODP of 0.055; HFCs like R-134a and R-410A have zero ODP.

What ASHRAE/ARI color code identifies R-404A refrigerant cylinders?

Answer: Orange

ASHRAE/ARI assigns orange as the standard cylinder color for R-404A, the HFC blend widely used in commercial refrigeration as an R-502 replacement.

Which ASHRAE refrigerant numbering series designates inorganic compounds such as ammonia and CO2?

Answer: 700 series

The 700 series designates inorganic refrigerants in the ASHRAE 34 system, including R-717 (ammonia) and R-744 (carbon dioxide).

What is the approximate normal boiling point of R-134a at atmospheric pressure?

Answer: -15°F (-26°C)

R-134a boils at approximately -15°F (-26.1°C) at atmospheric pressure, which is higher than older CFC and HCFC refrigerants like R-12 and R-22.