Study 3 Type II: High- and Very-High-Pressure Appliances with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
Which appliances are covered by EPA Section 608 Type II certification?
Type II certification covers servicing or disposing of high- or very-high-pressure appliances, except small appliances and motor-vehicle air conditioners. It is required when work may release refrigerant.
How does a psia pressure differ from a psig reading?
A psia chart uses absolute pressure; a psig reading is lower by atmospheric pressure. At sea level, the difference is about 14.7 psi.
What can indicate a refrigerant leak?
Excessive superheat or oil traces around a leak on a hermetic system can indicate a leak.
Which gases are appropriate for leak testing a refrigeration system?
Use dry nitrogen alone, or nitrogen with a trace of refrigerant to help locate leaks. Never pressurize a refrigeration system with oxygen or compressed air; use a regulator and relief device with nitrogen.
What are the traditional annual leak-repair trigger rates?
For appliances containing 50 pounds or more of ozone-depleting refrigerant, the traditional annual trigger rates are 30% for industrial process refrigeration, 20% for commercial refrigeration, and 10% for comfort cooling and other appliances.
What does refrigerant recovery do?
Recovery removes refrigerant and stores it in an external container; it does not necessarily clean or test the refrigerant. Do not intentionally vent refrigerant during service.
What recovery approach usually speeds refrigerant removal?
Recovering liquid refrigerant first usually speeds recovery. Recovery may also be sped up by chilling the cylinder or carefully warming the appliance or vessel, within equipment limits.
What can a pressure rise after evacuation indicate?
After reaching the required evacuation level, wait a few minutes and check pressure. A rise can mean refrigerant remains in liquid form or is coming out of oil, so continue recovery as needed.
What evacuation level applies to a very-high-pressure appliance?
Very-high-pressure appliances require 0 inches Hg vacuum, whether recovery equipment was made before or after November 15, 1993.
How should leaking components be handled when they prevent full evacuation?
If a leak prevents the required level, isolate leaking components where possible. Evacuate sound components to the required level; recover from leaking components to the lowest attainable level without substantial contamination, but not above 0 psig.
What is the maximum fill level for a recovery cylinder?
Use only approved, reusable recovery cylinders; never refill disposable cylinders. Do not fill a recovery cylinder beyond 80% of its capacity because liquid expansion can create dangerous pressure.
Can a hermetic compressor be energized while under vacuum?
Do not energize a hermetic compressor while it is under vacuum. Follow electrical lockout and equipment procedures before service.
A medium-difficulty quiz on EPA pressure categories, refrigeration-cycle components, pressure behavior, and safety hazards.
Learn how refrigerant families differ in applications, environmental effects, operating conditions, safety classifications, equipment compatibility, and handling requirements.
Learn how refrigerants affect ozone and climate, how regulations govern their use, and how to handle and select them responsibly.
Learn how refrigerants affect ozone and climate, how regulations govern their use and release, and what environmental and safety factors shape refrigerant selection.
A medium-difficulty quiz on applying safe refrigerant-handling practices, including hazard recognition, protective measures, leak response, and exposure response.
Learn how to identify refrigerants, manage their hazards, recover and handle them safely, and prevent leaks.
A medium-difficulty quiz on identifying refrigerants, managing hazards, using equipment safely, preventing leaks, and handling cylinders.
Practice chiller recovery, safety checks, endpoint verification, and service documentation. Follow equipment-specific procedures and applicable requirements.
A practical framework for safely recovering refrigerant from chillers, verifying recovery and dehydration endpoints, troubleshooting problems, and documenting service work.
Practice applying refrigerant compliance rules to equipment identification, refrigerant handling, technician qualifications, transfers, and recordkeeping.
A practical guide to checking refrigerant rules, assigning work appropriately, preventing releases, handling recovered refrigerant, and keeping the records required for specific jobs.
A medium-difficulty quiz on identifying small appliances and applying Section 608 service, recovery, leak-check, and disposal practices.