313D Safety and Regulations 2

Question 1

Under EPA Section 608, which refrigerant recovery technique is required when the compressor is inoperative?

Accepted Answer

Push-pull recovery

Answer

Push-pull recovery uses both the recovery machine inlet and outlet to maximize refrigerant removal when the system compressor cannot assist.

Question 2

What is the maximum allowable leak rate for a comfort cooling appliance containing 50 or more pounds of refrigerant before repair is required?

Accepted Answer

10% per year

Answer

EPA regulations set the leak rate threshold for comfort cooling appliances at 10% of charge per year, above which the owner must repair the leak.

Question 3

Which OSHA standard governs lockout/tagout procedures for HVAC technicians working on energized equipment?

Accepted Answer

29 CFR 1910.147

Answer

29 CFR 1910.147 is the OSHA Control of Hazardous Energy (Lockout/Tagout) standard that applies to servicing and maintenance of equipment.

Question 4

A technician discovers a system using R-22. Under current EPA rules, what refrigerant options exist for topping off this system?

Accepted Answer

Reclaimed R-22 or approved substitute refrigerants

Answer

As of 2020, only reclaimed or recycled R-22 may be used for servicing existing R-22 systems; virgin R-22 production has been phased out.

Question 5

When working with refrigerants, safety data sheets (SDS) must be available to employees under which OSHA standard?

Accepted Answer

29 CFR 1910.1200

Answer

OSHA's Hazard Communication Standard (29 CFR 1910.1200) requires employers to maintain SDS for all hazardous chemicals, including refrigerants.

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