4 Equipment, Cylinders, and Safety Free Online FlashCards

What does refrigerant recovery do?

Recovery removes refrigerant from an appliance and stores it in an external container; it does not necessarily clean or test the refrigerant.

How should you verify recovery equipment is suitable?

Use recovery equipment certified for the applicable use and refrigerant. Check its certification label and follow the manufacturer’s instructions.

Why must different refrigerants be kept separate?

Keep refrigerants separate. Mixing them can make recovery and reclamation difficult.

What does a refrigerant pressure–temperature chart show?

A pressure–temperature chart relates a refrigerant’s saturation pressure to its saturation temperature. Use the chart for the specific refrigerant.

How does temperature affect pressure in a cylinder containing liquid and vapor?

When liquid and vapor coexist in a closed cylinder, warming it raises its saturation pressure; cooling it lowers the pressure.

How should you monitor how much refrigerant enters a cylinder?

Use a scale to monitor the amount transferred. Pressure mainly reflects temperature when liquid and vapor coexist, not the amount of refrigerant.

Can a disposable refrigerant cylinder be refilled?

Never refill a disposable refrigerant cylinder.

What should you inspect on a recovery cylinder before use?

Before use, check for damage, corrosion, legible markings, and valid inspection or qualification status.

What are two direct hazards of refrigerant exposure?

Refrigerant vapor can displace oxygen and cause asphyxiation; liquid refrigerant can cause frostbite. Use ventilation, eye protection, and gloves.

What gas should be used for pressure testing or leak detection?

Use dry nitrogen, never oxygen or compressed air. Oxygen or air mixed with oil under pressure can create a fire or explosion hazard.

How can hose dimensions affect recovery speed?

Long, narrow hoses can restrict flow and slow refrigerant transfer. Use hoses as short and large in diameter as practical.

Does high cylinder pressure alone prove a cylinder is overfilled?

No. High cylinder pressure can result from high temperature, so pressure alone does not prove that the cylinder is overfilled.