Questions and Answers
Which of the following are included in EPA's definition of a small appliance? (Select all that apply)
What is an approved substitute refrigerant for new household refrigerators, freezers, and combination refrigeration/freezers?
R-600A
Hydrocarbons are approved for retrofit into existing household refrigerators.
False
What percentage of the refrigerant must recovery devices recover when the compressor is operating?
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Who must certify recovery equipment used for small appliances that use CFCs, HCFCs, and HFCs?
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What standard must equipment used to recover refrigerants from small appliances meet?
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The sale of CFC, HCFC, and HFO refrigerants is restricted to which type of technicians?
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It is mandatory to repair a leak in a small appliance when servicing it.
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What describes low loss fittings on refrigerant recovery devices?
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Which refrigerant is very high pressure and generally does NOT need to be recovered?
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What should a technician do if the refrigerant in a recovery cylinder is suspected to be contaminated?
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If a reclamation facility receives a tank of mixed refrigerant, what may they do?
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The system dependent (passive) recovery process can be performed on a system with a non-operating compressor.
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What should be done to the fitting when installing access fittings onto a sealed system?
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A standard vacuum pump designed specifically for evacuation can be used as a recovery device.
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How many access valves are needed to recover the refrigerant on a sealed system with an operating compressor that has a completely restricted capillary tube?
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What can be done to speed up the recovery process from a frost-free refrigerator?
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What is required when attaching a gauge set to check system pressures?
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What must be done to the refrigerant vented off the top when filling a charging cylinder?
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Why should technicians watch for signs of contamination in the oil during refrigerant recovery?
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Why should low and high access valves be installed when recovering refrigerant from a household refrigerator?
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Which of the following are recommended safe work practices when recovering refrigerants? (Select all that apply)
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When using nitrogen in repairing a sealed refrigeration system, what should the nitrogen tank always be equipped with?
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A very large refrigerant leak can cause suffocation because refrigerants are lighter than air.
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What can CFC and HCFC refrigerants decompose into at high temperatures?
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Permanent safety markings are required on the exterior of household refrigerators using HC refrigerants.
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What is typically used on small appliances for adding or removing refrigerant?
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What type of appliances can technicians charge and open after passing the Type 1 examination?
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What do EPA section 608 rules require from technicians in terms of HCFCs and HFCs recovery from small appliance sealed systems?
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An MVAC-like system that holds three pounds of R-12 meets the criteria for Type 1 appliance certification.
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When recovering refrigerant into a non-pressurized container, what is necessary when the compressor is inoperative?
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When R-410A is recovered from an appliance, what should it be recovered into?
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It is essential to help release trapped refrigerant from the compressor oil during recovery when using self-contained recovery devices.
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Which condition requires accessing both high and low sides of the system for refrigerant recovery?
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What percentage of the nameplate charge must technicians recover from a CFC, HCFC, or HFC system with an operating compressor?
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What is the approximate pressure of a storage cylinder of recovered R-134a stored at room temperature (80F)?
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What gases can CFC and HCFC refrigerants decompose into at high temperatures?
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Permanent safety markings are required on the exterior of household refrigerators using HC refrigerants.
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Which of the following statements about propane cylinders is true?
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Which type of refrigerant is the most harmful to stratospheric ozone?
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Hydrocarbons are approved for retrofit into existing household refrigerators.
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What type of certification is required for persons recovering CFCs, HCFCs, or HFCs during maintenance of small appliances?
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For which refrigeration systems is it permissible to use a passive recovery device for recovery of HFCs, CFCs, and HCFCs?
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Persons working on small appliances are exempt from having at least one self-contained recovery machine available.
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New household refrigerators may be factory charged with any refrigerant except for which one?
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What is the approximate pressure of a storage cylinder of recovered R-404A stored at room temperature (80F)?
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What condition can cause excessive pressure on the high side of a self-contained recovery device?
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At what pressure must the recovery procedure begin if the system is at?
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Which recovery equipment maintenance practice should be performed regularly?
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Study Notes
EPA and Small Appliances
- A small appliance is defined by the EPA as a product fully manufactured, charged, and hermetically sealed in a factory.
- Equipment used for refrigerant recovery must adhere to strict efficiency standards, such as recovering 90% of refrigerant during operation or achieving a 4-inch vacuum as per AHRI 740.
Approved Refrigerants
- R-600A is an approved substitute refrigerant for new household refrigerators, while hydrocarbons are not approved for retrofit into existing appliances.
- CFCs, HCFCs, and HFOs can only be sold to EPA-certified technicians for service or installation of refrigeration and air conditioning equipment.
Recovery Devices
- Recovery devices must recover at least 80% of the refrigerant with an inoperative compressor and 90% with an operative compressor.
- Permanent safety markings on household refrigerators using HC refrigerants are not required on the exterior.
Leak Management
- It's recommended to repair leaks found during servicing small appliances, though not mandatory.
- Contaminated refrigerant in a recovery cylinder should be turned in for reclamation.
Safety and Best Practices
- Safety practices include wearing eyewear and butyl-lined gloves when handling refrigerant hoses.
- While using nitrogen for repairs, tanks should always be equipped with a regulator.
Refrigerants and Environmental Impact
- CFCs are the most harmful to stratospheric ozone and can decompose into hydrochloric and hydrofluoric acids at high temperatures.
- Large refrigerant leaks can displace oxygen and cause suffocation due to being heavier than air.
Certification Requirements
- Technicians must obtain Type 1 or universal certification to recover CFCs, HCFCs, or HFCs while servicing small appliances.
- Only one access valve is necessary for recovery from sealed systems, especially those with restricted capillary tubes.
Recovery Techniques
- System-dependent recovery can only occur when the compressor operates.
- Recovering R-410A requires using a clearly marked recovery vessel to prevent mixing.
Maintenance and Equipment Care
- Regular maintenance of recovery equipment includes checking for refrigerant leaks.
- Accessing both high and low sides of a system is necessary when the compressor is not running.
Miscellaneous
- Refrigerant vented while filling a charging cylinder must be recovered if it is a CFC, HCFC, or HFC.
- Use of refuge or recovery devices is mandated to improve recovery speed and efficiency.
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Description
Test your knowledge on the EPA's definition of small appliances and approved refrigerants with these flashcards. You'll learn about essential products, substitutes, and regulations related to household refrigeration. Perfect for students or professionals in the field of environmental science.