313D Regulations, Codes, and Safety Standards 3

Question 1

Which regulation governs the transportation of refrigerant cylinders by road and specifies proper labeling and packaging requirements?

Accepted Answer

DOT 49 CFR Part 173

Answer

DOT 49 CFR Part 173 establishes packaging, labeling, and hazmat shipping requirements for compressed gas cylinders including refrigerants transported by road.

Question 2

What is the purpose of a high-pressure relief device required by ASHRAE 15 on refrigerant systems?

Accepted Answer

To prevent system pressure from exceeding the design working pressure

Answer

ASHRAE 15 mandates pressure relief devices to automatically vent refrigerant and prevent catastrophic failure if system pressure exceeds the maximum allowable working pressure.

Question 3

Under the 2021 International Residential Code, what is the minimum required capacity for a condensate overflow shutoff device?

Accepted Answer

The device must stop the unit before the overflow pan fills

Answer

The IRC requires overflow shutoff devices to stop unit operation before condensate overflows the secondary pan, preventing water damage regardless of specific flow capacity.

Question 4

Which safety standard specifically addresses electrical requirements for motor-compressors and their associated control equipment in air conditioning systems?

Accepted Answer

NEC Article 440

Answer

NEC Article 440 specifically covers hermetic refrigerant motor-compressor electrical requirements, including conductor sizing, overcurrent protection, and disconnect means.

Question 5

When is a mechanical room required by ASHRAE 15 for a residential refrigeration system using a Group A1 refrigerant like R-410A?

Accepted Answer

Never; Group A1 refrigerants are exempt from mechanical room requirements

Answer

ASHRAE 15 exempts Group A1 refrigerants (low toxicity, nonflammable) from mandatory mechanical room requirements because they pose minimal risk in occupied spaces.

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

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

313D Regulations, Codes, and Safety Standards 3