Core pt3

When working with an appliance containing HCFCs or HFCs, which of the following does NOT require a person to be a Section 608 certified technician?

Rewiring an external electric circuit.

Why do EPA regulationg require appliances to have a service aperture or process stub?

To make it easier to recover refrigerant.

A major system repai is being performed on an R-22 appliance. What CANNOT be done to recharge the appliance?

Top off the unit with R-410A.

When pressurizing a refrigeration system with nitrogen what rule should you always follow?

Use a pressure regulator with a pressure relief valve on the nitrogen cylinder.

Which of the following releases of a refrigerant is illegal?

Venting refrigerant from a recovery machine or recovery cylinder.

What range is displayed on a high pressure gauge on a service manifold?

0 to 800 psi

You have to leak-check a unit which has lost a complete charge. Which gas(es) would cause the LEAST damage to the environment?

Dry nitrogen

What effect will low ambient temperatures have on recovery

Increase the recovery time.

What is the state of the refrigerant entering the compressor of a refrigeration system?

Low pressure vapor

Which type of lubricants are HFO refrigerants are miscible in?

POE lubricants

What must be done before shipping any used refrigerant in a cylinder?

Properly label the refrigerant container.

Which of the following refrigerants contains chlorine?

R-22

.Which of the following refrigerants has the lowest global warming potential?

R-600

What is the term for removing refrigerant in any condition from a system and storing it in an external container without necessarily testing or processing it in any way?

Recovering

What is the center port on a three port manifold used for?

Recovery, evacuation, and charging.

In which of the following scenarios can refrigerant be vented?

Releasing isobutane from a household freezer.

What does ozone depletion potential (or'ODP) measure?

The ability of a substance to destroy ozone in the stratosphere.

How does the global warming potential of R-410A compare to carbon dioxide?

They are equal.

How do the global warming potentials of isobutane (R-600a), propane (R-290), and R-441A compare to the GWPs of HFC-134a, R-404A, and R-410A?

They are significantly lower

What characteristic of HFC refrigerants make them damaging to the environment?

They can have very high global warming potentials.

What characteristic(s) of CFCs and HCFCs make them more likely to reach the stratosphere than most other compounds containing chlorine?

They do not dissolve in water or easily break down in the atmosphere

Which of the following is a reason to heat a system during dehydration?

To decrease dehydration time

Which types of refrigerant can only be sold to persons who have successfully passed the EPA's Section 608 certification exam?

All refrigerants that are not exempt from the venting prohibition.

Which of the following is not a reason to recover refrigerants?

Avoid violating the warranty on equipment.

Under what conditions may you use a disposable cylinder to recover rerigerant?

Never