Questions and Answers
Which ASHRAE classification means slightly flammable?
Silicone elastomers, for use in seals and gaskets, are not compatible with which refrigerants?
HCFCs contain:
Hydrogen, chlorine, fluorine and carbon.
What does the term 'recycle' mean in refrigerant processing?
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List an example of an HFO refrigerant.
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Which type of refrigerant contains no chlorine?
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What is the Significant New Alternatives Policy (SNAP) Program?
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Before shipping any used refrigerant cylinders, what standards should be checked?
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The low-side test-pressure data-plate value should be used for?
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A single chlorine atom can destroy how many ozone molecules?
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HFCs ________.
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Crop loss, eye disease, and skin cancer have been attributed to:
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How much can a person be fined per day per violation for knowingly releasing a regulated substance that violates the Clean Air Act?
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The proper disposal method for ____________ is to recover any remaining refrigerant, render the cylinder useless and then recycle the metal.
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Which of the following has the highest Ozone Depletion Potential?
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Which refrigerant has a GWP closest to '1'?
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The chlorine in CFCs and HCFCs:
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A refrigerant cylinder designed to hold recovered refrigerant has a:
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An ozone molecule contains:
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The compressor ____________________________________.
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Study Notes
ASHRAE Classifications
- A2L classification indicates slightly flammable refrigerants.
- Refrigerants classified by toxicity: Class A (safest) and Class B (toxic).
- Flammability levels: 1 (no), 2 (low), and 3 (high).
Compatibility of Elastomers
- Silicone elastomers are not compatible with HFO refrigerants.
Composition of HCFCs
- HCFC refrigerants are composed of hydrogen, chlorine, fluorine, and carbon.
Refrigerant Recycling Process
- Recycling involves cleaning refrigerant by separating oil and removing moisture using filter driers.
- Reduces acidity, moisture, and particulate matter in refrigerants.
Examples of HFO Refrigerants
- R-1234ze is an example of an HFO refrigerant.
Characteristics of HFCs
- HFCs consist of hydrogen, fluorine, and carbon.
- They do not contain chlorine, thus not contributing to ozone layer depletion, but have a high Global Warming Potential (GWP).
Significant New Alternatives Policy (SNAP)
- The SNAP program is an EPA initiative focused on refrigerants with reduced environmental and health risks.
Standards for Shipping Used Refrigerant Cylinders
- Compliance with Department of Transportation standards is required before shipping.
Leak Testing Regulations
- Use the low-side test-pressure data-plate value to determine safe leak testing pressure.
Ozone Depletion by Chlorine
- One chlorine atom can destroy up to 100,000 ozone molecules and can remain in the stratosphere for 120 years.
HFCs and Ozone Depletion
- HFCs do not harm stratospheric ozone but have a significant Global Warming Potential.
Consequences of Ozone Depletion
- Crop losses, eye diseases, and increased skin cancer are linked to the depletion of stratospheric ozone.
Fines for Clean Air Act Violations
- Violators can be fined $44,539 per day for knowingly releasing regulated substances.
Disposal of Disposable Refrigerant Cylinders
- Recover refrigerant before disposal, render the cylinder useless, and recycle the metal.
Ozone Depletion Potential (ODP) of Refrigerants
- CFCs are known for having the highest Ozone Depletion Potential among refrigerants.
GWP of Refrigerants
- R-1233zd has a GWP very close to 1, making it relatively environmentally benign.
Behavior of Chlorine in Refrigerants
- Chlorine in CFCs and HCFCs does not dissolve in water, preventing it from being removed from the atmosphere via rain.
Identification of Recovery Cylinders
- Refrigerant cylinders for recovered refrigerant are designed with a grey body and yellow top.
Nature of Ozone
- Ozone is made of three oxygen atoms (O3) and protects against harmful UV radiation while helping stabilize Earth’s temperature.
Function of Refrigeration Compressors
- The compressor in a refrigeration cycle converts low-pressure vapor into high-pressure vapor, serving a critical role in the vapor-compression process.
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Test your knowledge with these core flashcards for EPA 608 certification. The quiz includes essential questions on ASHRAE classifications and refrigerant compatibility. Perfect for those preparing for HVAC certification exams.