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Questions and Answers
What factors affect the evacuation process?
What factors affect the evacuation process?
What elements do HCFC refrigerants contain?
What elements do HCFC refrigerants contain?
What could be the reason if a system will not hold vacuum after it has been evacuated?
What could be the reason if a system will not hold vacuum after it has been evacuated?
What is required for all recovery equipment being made?
What is required for all recovery equipment being made?
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What is the color code for approved refrigerant recovery cylinders?
What is the color code for approved refrigerant recovery cylinders?
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What should a technician do with refrigerant during servicing?
What should a technician do with refrigerant during servicing?
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What type of oil is commonly used in stationary air conditioning applications with HFC-410A refrigerant?
What type of oil is commonly used in stationary air conditioning applications with HFC-410A refrigerant?
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What is ozone in the stratosphere above the earth composed of?
What is ozone in the stratosphere above the earth composed of?
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When can you use a disposable cylinder to recover refrigerant?
When can you use a disposable cylinder to recover refrigerant?
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What is the primary purpose of a Type II certification?
What is the primary purpose of a Type II certification?
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Why should PPE be worn when handling refrigerant cylinders?
Why should PPE be worn when handling refrigerant cylinders?
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What determines the length of dehydration time?
What determines the length of dehydration time?
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What should a technician explain to a customer regarding refrigerant recovery efforts?
What should a technician explain to a customer regarding refrigerant recovery efforts?
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What can happen if refrigerant vapors or mist are inhaled?
What can happen if refrigerant vapors or mist are inhaled?
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What can state and local governments create regarding environmental regulations?
What can state and local governments create regarding environmental regulations?
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What is a violation of the Clean Air Act?
What is a violation of the Clean Air Act?
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What elements do HFC refrigerants contain?
What elements do HFC refrigerants contain?
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What does it mean if an oil is hygroscopic?
What does it mean if an oil is hygroscopic?
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What type of recovery equipment relies on the pressure of the refrigerant in the appliance?
What type of recovery equipment relies on the pressure of the refrigerant in the appliance?
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What is the process of removing refrigerant from a system and storing it in an external container?
What is the process of removing refrigerant from a system and storing it in an external container?
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What is used to remove ice from a sight glass?
What is used to remove ice from a sight glass?
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What type of refrigerants are chlorine-free?
What type of refrigerants are chlorine-free?
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Why is the recovery of refrigerants necessary?
Why is the recovery of refrigerants necessary?
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What is an example of an HFC refrigerant?
What is an example of an HFC refrigerant?
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What does a compound pressure gauge typically measure?
What does a compound pressure gauge typically measure?
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What is the process of cleaning refrigerant by oil separation and filter-driers called?
What is the process of cleaning refrigerant by oil separation and filter-driers called?
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What is the range of a high pressure gauge on service manifold sets?
What is the range of a high pressure gauge on service manifold sets?
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What type of cylinder is designed to hold recovered refrigerant?
What type of cylinder is designed to hold recovered refrigerant?
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What type of refrigerant is the least harmful to stratospheric ozone?
What type of refrigerant is the least harmful to stratospheric ozone?
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What is the most effective method for locating the general area of a small leak?
What is the most effective method for locating the general area of a small leak?
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What percentage of capacity should a refillable refrigerant cylinder never be filled to by weight?
What percentage of capacity should a refillable refrigerant cylinder never be filled to by weight?
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Which type of refrigerant has the highest ozone depletion potential?
Which type of refrigerant has the highest ozone depletion potential?
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What is the chemical found in the upper stratosphere that indicates ozone layer destruction?
What is the chemical found in the upper stratosphere that indicates ozone layer destruction?
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What factors affect the speed of evacuation?
What factors affect the speed of evacuation?
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What elements are found in HCFC refrigerants?
What elements are found in HCFC refrigerants?
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What does it indicate if a system will not hold vacuum after evacuation?
What does it indicate if a system will not hold vacuum after evacuation?
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When can a disposable cylinder be used to recover refrigerant?
When can a disposable cylinder be used to recover refrigerant?
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What color code is used for approved refrigerant recovery cylinders?
What color code is used for approved refrigerant recovery cylinders?
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Study Notes
Refrigerants and Ozone Depletion
- CFCs, HCFCs, and HFCs contribute to global warming.
- CFCs will no longer be manufactured or imported into the United States after 1995.
Refrigerant Types and Components
- HFC refrigerants contain hydrogen, fluorine, and carbon.
- HCFC refrigerants contain hydrogen, chlorine, fluorine, and carbon.
- CFCs contain chlorine, fluorine, and carbon.
- HFCs are less harmful to stratospheric ozone than CFCs.
- Refrigerants containing Bromine are the most harmful to stratospheric ozone.
Refrigerant Recovery and Handling
- The recovery of refrigerants is necessary to maintain adequate supplies for service calls, prevent venting to the atmosphere, and prevent stratospheric ozone depletion.
- Recovery equipment that relies on the pressure of the refrigerant in the appliance is considered system-dependent.
- Recovery equipment that relies on the compressor in the system is also considered system-dependent.
- "Self-contained" recovery devices can capture liquid and/or vapor refrigerant without assistance from components in the air-conditioning or refrigeration equipment.
- A cylinder with a gray body and a yellow top is designed to hold recovered refrigerant.
- Refillable refrigerant cylinders must never be filled to more than 80% of their capacity by weight.
Safety and Equipment
- PPE (gloves, safety glasses, safety shoes, etc.) should always be worn when handling and filling refrigerant cylinders.
- Refrigerant vapors or mist should not be inhaled because they may cause heart irregularities and/or unconsciousness.
- An oil sample should be taken for reasons such as the system having a leak or a major component failure.
- Use an alcohol spray to remove ice from a sight glass.
- A compound pressure gauge, typically used on the low side of the system, measures pressure in psig and inches of mercury.
Environmental Regulations
- Violations of the Clean Air Act include falsifying or failing to keep required records, failing to reach required evacuation levels, and knowingly releasing CFC or HCFC refrigerants or their substitutes.
- State and local governments can make laws that follow the Clean Air Act/EPA regulations or contain stricter regulations.
- The EPA requires the installation of a service aperture or process stub on all appliances using a class I or class II substance as a refrigerant.
Ozone Depletion
- Ozone depletion in the stratosphere is a global problem.
- Ozone in the stratosphere above the earth consists of molecules of 3 oxygen atoms.
- Chlorine monoxide is a chemical found in the upper stratosphere, indicating that the ozone layer is being destroyed.
Miscellaneous
- Technicians receiving a passing grade on the Type II (medium-pressure, high-pressure, and very high-pressure) exam are certified to recover refrigerant during maintenance, service, or repair of medium- and high-pressure equipment.
- Ester-based oils can be mixed with no other oils.
- The synthetic lubricant presently used with ternary blends containing HCFCs is alkylbenzene.
- If a system will not hold vacuum after it has been evacuated, it may be leaking.
- The size of the equipment being evacuated, the ambient temperature, and the amount of moisture in the system affect the speed of evacuation.
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Description
This quiz covers questions related to refrigeration and air conditioning, including types of refrigerants, oils used, and technician certifications.
