Understanding Refrigerant Properties and Types

Front

What is the bubble point used for in refrigerant systems?

Back

Charging by condenser subcooling

Front

Which series of refrigerants are near azeotropic blends that can leak at uneven rates?

Back

R-400 series

Front

What is the proper method for charging R-400 series blended refrigerants? Options: Weigh the refrigerant into the low side as a vapor, Weigh the refrigerant into the high side as a liquid, Add refrigerant as a gas into the high side, Add refrigerant as a liquid into the low side

Back

Weigh the refrigerant into the high side as a liquid

Front

Which refrigerant is known for having a high-temperature glide and may experience fractionation? Options: R-134a, R-407C, R-410A, R-717

Back

R-407C

Front

What is the pressure range for medium-pressure refrigerants at a liquid-phase temperature of 104°F?

Back

Between 30 psig & 155 psig

Front

Which of the following is an example of a low-pressure refrigerant? HFC-134a, HCFC-22, CFC-11, CO2 (R-744)

Back

CFC-11

Front

What is the EPA's stance on substitute refrigerants for retrofitting systems?

Back

Only EPA-approved substitutes can be used.

Front

Which refrigerant is classified as a very high-pressure refrigerant at 104°F? Options: HFC-245fa, HFC-407C, CO2 (R-744), HFO-1234yf

Back

CO2 (R-744)

Front

Why must equipment be designed to handle certain refrigerants?

Back

Due to their flammability

Front

What is the concern with using blended refrigerants in systems that develop a leak?

Back

They may fractionate.