CAR Appliance Recycler Recycling & Waste Management 3

Question 1

Which type of refrigerant is classified as a hydrofluorocarbon (HFC) with zero ozone depletion potential but high global warming potential?

Accepted Answer

R-134a

Answer

R-134a is an HFC refrigerant with zero ozone depletion potential but a global warming potential of 1,430 times that of CO2.

Question 2

What is the purpose of a manifold gauge set in appliance refrigerant recovery?

Accepted Answer

To monitor system pressures and control refrigerant flow during recovery

Answer

A manifold gauge set monitors high-side and low-side pressures and controls refrigerant flow between the appliance and the recovery machine.

Question 3

Under EPA regulations, what is the required final system pressure after active refrigerant recovery from an appliance with a hermetically sealed compressor?

Accepted Answer

4 inches of mercury vacuum

Answer

EPA requires recovery to at least 4 inches of mercury vacuum for appliances with hermetically sealed compressors to ensure adequate refrigerant removal.

Question 4

What environmental problem does proper oil drain-down from compressors prevent during appliance shredding?

Accepted Answer

Release of oil into shredder residue causing soil contamination

Answer

Compressor oil drained before shredding prevents petroleum contamination of shredder residue, reducing the risk of the residue being classified as hazardous waste.

Question 5

Which appliance component is the primary source of elemental mercury recovered during recycling?

Accepted Answer

Thermostat bimetal switch

Answer

Mercury tilt switches used in older appliance thermostats are the primary source of elemental mercury that must be removed before shredding.

(CAR) Certified Appliance Recycler Practice Test

(CAR) Certified Appliance Recycler Practice Test

CAR Appliance Recycler Recycling & Waste Management 3