FREE 313D Refrigerant Handling and Recovery Questions and Answers

Question 1

A technician is recovering R-410A from a residential system using a recovery machine. The recovery cylinder, which has a water capacity (WC) of 47.6 lbs and a tare weight (TW) of 18 lbs, is placed on a digital scale. What is the maximum final weight on the scale before the recovery process must be stopped?

Accepted Answer

56.1 lbs

Answer

To prevent dangerous hydrostatic pressure from liquid expansion, recovery cylinders must not be filled with liquid refrigerant beyond 80% of their water capacity. First, calculate the maximum refrigerant weight: 47.6 lbs (WC) * 0.80 = 38.08 lbs. Then, add the cylinder's tare weight (empty weight) to find the maximum gross weight: 38.08 lbs + 18 lbs (TW) = 56.08 lbs. The closest and safest answer is 56.1 lbs.

Question 2

According to Ontario Regulation 463/10 under the Environmental Protection Act, what is a key requirement for any person handling or purchasing refrigerants?

Accepted Answer

They must possess a valid Ozone Depletion Prevention (ODP) certificate.

Answer

In Ontario, the law requires that any individual who purchases, handles, or works with refrigerants must have completed an approved environmental awareness training course and hold a valid ODP certificate. This certification must be renewed every five years.

Question 3

A technician is preparing to recover refrigerant from a residential split system. To significantly increase the speed of the recovery process, which of the following actions is most effective?

Accepted Answer

Removing the Schrader valve cores from the service ports.

Answer

The Schrader valve core is the most significant restriction in the service port. Removing it with a core removal tool before starting the recovery process dramatically increases the flow rate of both liquid and vapor refrigerant, significantly speeding up the job.

Question 4

While recovering refrigerant, a technician notices that the pressure in the recovery cylinder is rising quickly, slowing down the process. Which of the following is a recommended procedure to manage this issue and speed up recovery?

Accepted Answer

Cool the recovery cylinder using a water bath or wet rags.

Answer

Refrigerant recovery relies on maintaining a pressure differential between the system and the recovery tank. As the tank fills, its internal pressure and temperature rise, slowing recovery. Cooling the cylinder lowers its internal pressure, which helps maintain a favorable pressure difference and speeds up the recovery process.

Question 5

Which of the following statements is TRUE regarding the handling of different types of refrigerants during recovery?

Accepted Answer

Different refrigerants must never be mixed in the same recovery cylinder.

Answer

Cross-contamination of refrigerants is strictly prohibited. Each type of refrigerant must be recovered into its own dedicated and clearly labeled recovery cylinder. Mixing refrigerants creates a contaminated blend that cannot be reused and is expensive and difficult to dispose of properly.

(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test

(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test

FREE 313D Refrigerant Handling and Recovery Questions and Answers