5 Core Section Practice Free Online FlashCards

What does ozone-depletion potential (ODP) measure?

ODP compares a substance’s ozone-depleting effect with that of CFC-11.

What does global-warming potential (GWP) compare?

GWP compares a substance’s heat-trapping effect with carbon dioxide over a specified period.

Does R-134a deplete stratospheric ozone?

No. R-134a is an HFC with zero ODP, but it can still have climate impact because of its GWP.

Which Clean Air Act section principally covers stationary refrigeration?

Section 608 principally covers stationary air-conditioning and refrigeration; motor-vehicle air conditioning is principally covered by Section 609.

Which Section 608 certification types match the appliance categories?

Type I covers small appliances, Type II high- or very-high-pressure appliances, and Type III low-pressure appliances. Universal covers all three categories.

May technicians intentionally vent covered refrigerants during service?

Generally, no. Covered refrigerants and substitutes must not be intentionally vented during service, repair, maintenance, or disposal; only narrow exceptions apply.

What does refrigerant recovery mean?

Recovering removes refrigerant from equipment and stores it in an external container; it does not require testing or cleaning.

Why should refrigerants not be mixed?

Mixing can make refrigerant difficult or impossible to reuse and may require special handling. Identify and label refrigerants and cylinders clearly.

Why must a recovery cylinder not be overfilled?

Refrigerant expands as it warms, so an overfilled cylinder can develop dangerous hydraulic pressure. Stay within its approved capacity.

How does refrigerant transfer heat as it evaporates and condenses?

As refrigerant evaporates at low pressure, it absorbs heat; as it condenses at higher pressure, it releases heat.

What gas and protections are required for pressure testing?

Use dry nitrogen with a regulator and pressure-relief protection. Never use oxygen or compressed air, and do not exceed the specified test pressure.

Why is a refrigerant leak hazardous in a confined area?

A leak can displace oxygen in a confined or poorly ventilated area, creating an asphyxiation hazard. Ventilate the area and avoid unsafe spaces without appropriate training and protection.