ASE Refrigerant Recovery, Recycling, and Handling 2

Question 1

Recovery cylinders used to store used (contaminated) refrigerant must be labeled:

Accepted Answer

'Used Refrigerant — Do Not Mix with New Refrigerant'

Answer

DOT regulations require recovered (used) refrigerant cylinders to be clearly labeled to prevent the used refrigerant from being mistakenly introduced into a new vehicle system.

Question 2

What minimum vacuum level should an A/C system reach and hold during a proper evacuation?

Accepted Answer

29 inches Hg (500 microns or below)

Answer

A proper evacuation should pull the system to 500 microns (approximately 29.9 in Hg) or below to ensure all moisture and air are removed before recharging.

Question 3

Mixing different types of refrigerants (e.g., R-134a and R-1234yf) in the same cylinder or system is:

Accepted Answer

Prohibited and creates a contaminated blend that cannot be recycled on-site

Answer

Mixing refrigerants creates a contaminated blend that cannot be recycled on standard equipment and must be sent to a reclaimer, making it both costly and non-compliant.

Question 4

Which of the following is TRUE regarding the purchase of R-134a in containers larger than 2 lbs?

Accepted Answer

Only EPA Section 609-certified technicians may purchase it

Answer

Since January 2018, EPA Section 609 certification is required to purchase R-134a in containers larger than 2 lbs to ensure proper handling by trained personnel.

Question 5

An electronic refrigerant leak detector is being used after an A/C repair. Where should the technician START the inspection?

Accepted Answer

At the lowest points and A/C fittings since refrigerant vapors are heavier than air

Answer

Refrigerant vapors from R-134a and R-1234yf are heavier than air and settle at the lowest points, so checking fittings, hose connections, and low areas first improves detection accuracy.

ASE Practice Test

ASE Practice Test

ASE Refrigerant Recovery, Recycling, and Handling 2