Study 5 Recovery Completion and Troubleshooting with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
What confirms that refrigerant recovery is complete?
Confirm the required evacuation level at the appliance, ensure refrigerant is safely contained, and leave equipment and records in a known condition. Elapsed time or low recovery-machine inlet pressure alone does not prove completion.
What does a reading of 0 psig mean?
A reading of 0 psig is atmospheric pressure, not a vacuum.
How does the charge affect the evacuation level for medium-pressure appliances?
Under 200 lb requires 10 in. Hg vacuum; 200 lb or more requires 15 in. Hg vacuum.
What evacuation level applies to a low-pressure appliance?
The required level is 25 mm Hg absolute.
What can pressure rebound after recovery indicate?
A pressure rise can mean refrigerant is boiling out of oil or migrating from another section. Continue recovery as appropriate and verify the required level again before opening the circuit.
What is the recovery approach when a leak prevents reaching the normal evacuation level?
Where possible, isolate leaking from non-leaking components. Evacuate non-leaking portions to the required level and leaking portions to the lowest attainable level that does not substantially contaminate recovered refrigerant, not exceeding 0 psig.
How should a recovery cylinder’s fill be controlled?
Use a compatible, serviceable recovery cylinder and weigh it during and after recovery. Do not exceed its marked filling limit or maximum gross weight.
Why should different refrigerants not be combined in one cylinder?
Keep different refrigerants separate. Mixing can make them difficult or impossible to reuse and may require specialized handling.
What does refrigerant recycling mean?
Recycling cleans refrigerant for reuse in equipment owned by the same person.
What must happen before recovered refrigerant is resold after changing ownership?
If recovered refrigerant changes ownership, it must be reclaimed by an EPA-certified reclaimer before resale.
What should you check if recovery is unusually slow or stops early?
Check valve positions, hoses and filters, machine airflow, power supply, and whether the cylinder is full or overheated. Follow manufacturer instructions; do not bypass safety devices.
How should unexpectedly high cylinder pressure be handled?
Consider cylinder temperature and refrigerant identity, and let the cylinder stabilize before interpreting pressure. Do not vent refrigerant; stop handling a potentially overfilled, leaking, or unsafe cylinder and follow applicable procedures.
A medium-difficulty quiz on EPA pressure categories, refrigeration-cycle components, pressure behavior, and safety hazards.
Review how refrigerants transfer heat, how major refrigerant families differ, and how to select and handle them safely.
Learn how refrigerant families differ in applications, environmental effects, operating conditions, safety classifications, equipment compatibility, and handling requirements.
Practice determining appliance evacuation endpoints, measuring and verifying recovery, and checking recovery cylinders against the applicable 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.
A medium-difficulty quiz on identifying small appliances and applying Section 608 service, recovery, leak-check, and disposal practices.