HVAC EPA Regulations and Refrigerant Safety 1 — Questions and Answers
Question 1: Under EPA Section 608, technicians who purchase or handle refrigerants in HVAC/R systems must be what?
- Licensed by the state in which they work
- Certified under EPA Section 608 (Correct answer)
- Registered with the EPA's national HVAC database
- Certified by ASHRAE
Correct answer: Certified under EPA Section 608
EPA Section 608 of the Clean Air Act requires that technicians who service, maintain, repair, or dispose of appliances containing regulated refrigerants be certified.
Question 2: What does it mean for a refrigerant to have a high Global Warming Potential (GWP)?
- It is more flammable and requires special handling
- Releasing it into the atmosphere contributes significantly more to climate change than an equivalent mass of CO2 (Correct answer)
- It operates at higher pressures and temperatures
- It has higher toxicity and requires respiratory protection
Correct answer: Releasing it into the atmosphere contributes significantly more to climate change than an equivalent mass of CO2
GWP measures how much heat a greenhouse gas traps compared to CO2 over 100 years; a high-GWP refrigerant like R-410A (GWP=2088) has a much greater climate impact per pound released than CO2.
Question 3: What is the primary reason R-22 (HCFC) refrigerant is being phased out under the Montreal Protocol and US Clean Air Act?
- It is highly toxic and dangerous to human health
- It contains chlorine that destroys stratospheric ozone when released (Correct answer)
- It has poor energy efficiency compared to newer refrigerants
- It is highly flammable and presents a fire hazard
Correct answer: It contains chlorine that destroys stratospheric ozone when released
R-22 is an HCFC (hydrochlorofluorocarbon) that releases chlorine atoms when it breaks down in the stratosphere, catalytically destroying ozone molecules.
Question 4: Under EPA Section 608, what is required when removing refrigerant from an HVAC system?
- The refrigerant may be vented to atmosphere if less than 2 lbs remain
- Refrigerant must be recovered into an approved recovery cylinder using certified recovery equipment (Correct answer)
- Refrigerant must be destroyed on-site by an approved incineration method
- Only recovery is required; the refrigerant need not be reused or recycled
Correct answer: Refrigerant must be recovered into an approved recovery cylinder using certified recovery equipment
EPA Section 608 prohibits venting refrigerants and requires technicians to use certified recovery equipment to capture refrigerant into approved DOT cylinders before opening any system.
Question 5: What is the ASHRAE refrigerant safety classification system based on?
- Pressure rating and temperature range only
- Toxicity (A=lower, B=higher) and flammability (1=no flame, 2=lower, 3=higher) classes (Correct answer)
- Ozone depletion potential and global warming potential
- Chemical composition and molecular weight
Correct answer: Toxicity (A=lower, B=higher) and flammability (1=no flame, 2=lower, 3=higher) classes
ASHRAE's refrigerant classification uses a two-character system: a letter for toxicity (A=lower, B=higher) and a number for flammability (1=none, 2L=lower, 2=higher, 3=highest).
Question 6: What refrigerant type are HFOs (hydrofluoroolefins) designed to have compared to HFCs?
- Higher GWP and better energy efficiency
- Very low GWP while maintaining good thermodynamic properties (Correct answer)
- Higher ODP to compensate for lower GWP
- Lower pressure operation to improve safety
Correct answer: Very low GWP while maintaining good thermodynamic properties
HFO refrigerants (like R-1234yf and R-1234ze) were developed to provide very low GWP (less than 1) as a climate-friendly alternative to high-GWP HFC refrigerants.
HVAC EPA Regulations and Refrigerant Safety 1
Under EPA Section 608, technicians who purchase or handle refrigerants in HVAC/R systems must be what?