CFC Refrigerant Identification & Testing 2

Question 1

What is the ASHRAE numerical designation for the refrigerant formerly known by the trade name Freon-12?

Accepted Answer

R-12

Answer

Freon-12 is designated R-12 under the ASHRAE refrigerant numbering system, a fully halogenated CFC that was phased out under the Montreal Protocol.

Question 2

What is the standard AHRI cylinder color for R-134a refrigerant?

Accepted Answer

Sky blue

Answer

R-134a cylinders are painted sky blue (light blue) per AHRI cylinder color-coding standards, distinguishing it from R-22 (light green) and R-12 (white).

Question 3

When using a refrigerant identifier and receiving a 'FAIL - mixed refrigerant' reading, what does this indicate?

Accepted Answer

The cylinder contains two or more different refrigerants blended together

Answer

A 'mixed refrigerant' failure means the cylinder contains an unintended combination of different refrigerants that cannot be separated and must be sent for destruction, not recovery.

Question 4

What distinguishes R-410A from R-407C in terms of phase-change behavior during system testing?

Accepted Answer

R-410A has minimal temperature glide while R-407C has a significant glide of 4-7°F

Answer

R-410A is a near-azeotropic blend with minimal temperature glide, while R-407C is zeotropic with a temperature glide of approximately 4-7°F, which affects P-T chart readings.

Question 5

What is the moisture content limit for reclaimed R-22 per AHRI Standard 700?

Accepted Answer

10 ppm by weight

Answer

AHRI Standard 700 limits moisture in reclaimed R-22 to 10 ppm by weight to prevent ice formation in expansion devices and hydrolysis that produces corrosive acids.

(CFC) Chlorofluorocarbon Certification Practice Test

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CFC Refrigerant Identification & Testing 2