313D Regulations, Codes, and Safety Standards 2 — Questions and Answers
Question 1: Under EPA Section 608, what is the maximum allowable leak rate for a residential system with a charge greater than 50 pounds before repair is required?
- 5% per year
- 10% per year
- 15% per year (Correct answer)
- 25% per year
Correct answer: 15% per year
EPA Section 608 sets a 15% annual leak rate threshold for comfort cooling appliances with charges over 50 pounds, requiring repair within 30 days of discovery.
Question 2: Which ASHRAE standard sets minimum energy efficiency requirements for residential HVAC equipment in the United States?
- ASHRAE 15
- ASHRAE 62.1
- ASHRAE 90.1 (Correct answer)
- ASHRAE 34
Correct answer: ASHRAE 90.1
ASHRAE 90.1 establishes minimum energy efficiency standards for HVAC equipment, and residential equipment must meet these as a baseline for code compliance.
Question 3: What does the AHRI Certification Program verify for residential air conditioning equipment?
- Refrigerant purity levels
- Published capacity and efficiency ratings are accurate (Correct answer)
- Installation code compliance
- Technician licensing requirements
Correct answer: Published capacity and efficiency ratings are accurate
The AHRI Certification Program independently tests and verifies that manufacturers' published capacity and efficiency ratings match actual performance.
Question 4: Which federal regulation requires HVAC technicians to be certified before purchasing refrigerants in containers larger than 2 pounds?
- CAA Section 112
- CAA Section 608 (Correct answer)
- OSHA 1910.119
- DOT 49 CFR 173
Correct answer: CAA Section 608
Clean Air Act Section 608 requires technicians to hold EPA certification to purchase refrigerants in containers exceeding 2 pounds.
Question 5: What minimum clearance does the International Mechanical Code typically require between a rooftop condensing unit and a parapet wall?
- 6 inches
- 12 inches
- 18 inches (Correct answer)
- 24 inches
Correct answer: 18 inches
The IMC generally requires at least 18 inches of clearance between a condensing unit and any wall or obstruction to ensure adequate airflow and serviceability.
Question 6: Under OSHA standards, what is the permissible exposure limit (PEL) for R-22 (chlorodifluoromethane) over an 8-hour workday?
- 500 ppm
- 1,000 ppm (Correct answer)
- 2,000 ppm
- 5,000 ppm
Correct answer: 1,000 ppm
OSHA sets a PEL of 1,000 ppm (as a time-weighted average) for R-22 over an 8-hour work shift.
Question 7: Which code requires a condensate drain to be equipped with a trap of appropriate depth for systems with negative duct pressure?
- NEC Article 440
- IMC Section 307 (Correct answer)
- ASHRAE 15-2022
- IFC Section 605
Correct answer: IMC Section 307
IMC Section 307 governs condensate disposal and requires proper trapping to prevent air from being drawn back through the drain line under negative pressure conditions.
313D Regulations, Codes, and Safety Standards 2
Under EPA Section 608, what is the maximum allowable leak rate for a residential system with a charge greater than 50 pounds before repair is required?