4 Safe Refrigerant Handling and Recovery Free Online FlashCards

What does Section 608 prohibit during covered service?

Section 608 prohibits intentionally venting covered refrigerants during stationary air-conditioning and refrigeration service.

When must a technician be certified for refrigerant work?

Technicians must be certified for work that could reasonably be expected to open or compromise the refrigerant circuit.

What does refrigerant recovery mean?

Recovery removes refrigerant and stores it without necessarily processing it.

What recovery percentages apply to small appliances?

Compliant equipment must recover 90% when the compressor works, or 80% when it does not.

What evacuation target applies to a post-1993 high-pressure appliance charged with 200 lb or more?

For post-1993 high-pressure appliances charged with 200 lb or more, the target is 10 inches Hg vacuum. The applicable evacuation target depends on appliance characteristics.

How should parts be evacuated when a leak prevents reaching the required level?

Evacuate non-leaking parts to the required level and leaking parts to the lowest attainable level that does not substantially contaminate recovered refrigerant. The leaking part must not remain above 0 psig.

What can a pressure rise after recovery indicate?

A pressure rise after reaching a recovery target may indicate refrigerant remains in liquid form or is dissolved in oil.

How should a technician prevent a recovery cylinder from being overfilled?

Use a recovery-rated cylinder, monitor its weight with a scale, and never exceed its marked maximum fill weight. Leave room for liquid expansion.

Why must refrigerants be kept separate during recovery?

Do not mix refrigerants in a recovery cylinder; mixed refrigerants can be difficult or impossible to reclaim.

What can a pressure or vacuum decay test establish—and what can it not do?

A pressure or vacuum decay test can show that a system is leaking, but it does not locate the leak. Pair it with a leak-locating method.

Which gases must never be used to pressure-test a refrigerant system?

Never use oxygen or compressed air to pressure-test a refrigerant system.

How long must specified disposal records for appliances containing 5–50 lb of refrigerant be kept?

For appliances containing 5–50 lb of refrigerant, technicians disposing of them must keep specified recovery and transfer records for three years.