EPA 608 Review -- CORE pt 3

What could happen if a cylinder is overfilled and the temperature rises?

• The cylinder will shrink

• The refrigerant will freeze

• The cylinder could vent or explode

• The refrigerant will evaporate

What must cylinders exceeding 4.5" in diameter or 12" in length have?

• A thermometer

• A pressure-relief device

• A magnetic-reed float valve

• A sight glass

What should never be used with an R-410A condensing unit?

• R-22 air handler

• R-410A air handler

• Copper tubing

• Flushing solution

What is the purpose of flushing the tubing with nitrogen before using a flushing solution?

• To cool the system

• To remove loose contaminants

• To increase pressure

• To add moisture

What can R-12 and R-22 decompose into at high temperatures?

• Oxygen and nitrogen

• Hydrochloric and hydrofluoric acids

• Water and carbon dioxide

• Methane and ethane

What should be done if a recovery cylinder contains R-502 added to an R-22 system?

• Recover the refrigerant into the same cylinder

• Recover the refrigerant into a separate recovery cylinder

• Mix it with another refrigerant

• Use it as is

What is the purpose of replacing the liquid-line filter drier and adding a suction-line filter drier?

• To increase the system's pressure

• To improve the system's cooling efficiency

• To remove contaminants from the system

• To reduce the system's noise levels

What can transform oil into a sludge-like molasses in a system?

• Excess refrigerant

• High pressure

• Particulates, acid, and mineral oil

• Low temperature

What is the purpose of a manifold gauge set in a refrigeration system?

• To measure the temperature of the refrigerant

• To connect the low and high-pressure sides of the system

• To filter impurities from the refrigerant

• To increase the pressure of the refrigerant

What is a recommended practice when selecting hoses for a manifold gauge set?

• Use the longest hoses available

• Use the largest diameter and shortest hoses available

• Use hoses with the smallest diameter

• Use hoses with multiple valves