RSES Refrigerant Management 5

Question 1

A refrigerant is considered 'reclaimed' when it has been reprocessed to meet what standard?

Accepted Answer

ARI/AHRI Standard 700 purity specifications

Answer

Reclaimed refrigerant must meet AHRI Standard 700 purity specifications, which are equivalent to virgin refrigerant quality, before it can be resold.

Question 2

Which refrigerant application requires EPA Section 608 Type III certification?

Accepted Answer

Low-pressure refrigerants (R-11, R-113, R-123)

Answer

Type III certification covers low-pressure appliances using refrigerants such as R-11, R-113, and R-123, which operate below atmospheric pressure.

Question 3

What does 'fractionation' mean in the context of refrigerant blends, and when is it most likely to occur?

Accepted Answer

Preferential evaporation of blend components causing composition changes, most likely during vapor-only leaks

Answer

Fractionation occurs in zeotropic blends when components evaporate at different rates during a vapor leak, changing the remaining blend's composition and properties.

Question 4

Under current EPA regulations, what must happen to refrigerant recovered from a system before it can be returned to a different system owned by a different customer?

Accepted Answer

It must be sent to a certified reclaimer and meet AHRI 700 standards

Answer

Refrigerant recovered from one customer's equipment must be reclaimed to AHRI 700 standards before being used in another customer's equipment.

Question 5

What is the primary reason ammonia (R-717) is NOT widely used in comfort air conditioning despite its excellent thermodynamic properties?

Accepted Answer

It is toxic and has a strong pungent odor detectable at very low concentrations

Answer

Ammonia is toxic (ASHRAE B2L classification) and has a pungent odor detectable at 5 ppm, making it unsuitable for occupied building comfort cooling applications.

(RSES) Refrigeration Service Engineers Society Certification Practice Test

(RSES) Refrigeration Service Engineers Society Certification Practice Test

RSES Refrigerant Management 5