TYPE II EPA 608 Review Questions

Where must you connect a hose in order to recover liquid refrigerant?

The liquid line.

After a leak repair of a supermarket rack using 300 Ibs. of R-22 and a successful initial verification test, when must a follow-up leak verification test be conducted?

Within 10 days.

After refrigerant liquid has been recovered from the appliance, any remaining vapor is;

Removed by the recovery system.

How can you speed up the removal of the refrigerant charge from a system?

Cooling the recovery cylinder to lower its pressure.

When could a reciprocating compressor be damaged if energized?

When the discharge service valve is closed.

Starting in 2019, what leak rate triggers the EPA requirement that commercial refrigeration systems containing 50 pounds or more of R-22 be repaired?

20%

For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE

Standard 15 provided the mechanical ventilation system in the machinery room runs continuously.

R-717

An initial leak verification test failed after repairing a leak in a rack refrigeration system for a supermarket using a CFC refrigerant. What would be the next step(s)?

Conduct additional repairs within the 30-day repair window or mothball the appliance.

Identify the best method to charge a system that has both an air-cooled condenser and evaporator with a nameplate charge of 80 pounds.

Liquid charge through the liquid-line service valve.

It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. However, it;

Requires a pressure regulator.

Every refrigerating system must be protected by which of the following?

A pressure relief device.

What action must an owner/operator take if a supermarket system containing 50 or more pounds of R-22 leaks more than 125% of its full charge in a calendar year.

Submit a report to EPA describing efforts to identify leaks and repair the appliance.

What is a moisture indicating sight glass useful for?

Checking for moisture in the refrigerant.

Which part of a belt-driven non-hermetic compressor is most likely to leak if the compressor has not been used for several months?

Rotating shaft seal.

You are changing out the compressor of a system containing 40 pounds of R-404A. In addition to isolating the compressor, which of the following procedures should you follow?

Evacuate the isolated section of the system to 0 psig and if system pressure does not rise after a few minutes, remove the compressor.

Which of the following refrigerants would be used in a low pressure appliance?

R-123

What steps should be taken before using a recovery unit to remove a charge?

The recovery unit oil should be changed and recovery cylinder evacuated.

Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from a R-410 unit. What must be done before recovery?

Change the recovery cylinder on the recovery machine.

Before making a major repair, technicians must evacuate an appliance or component containing more than 200 pounds of R-410A to which of the following levels?

10 inches of Hg vacuum

Refrigerant cannot be recovered without isolating a parallel compressor system because of;

 An open equalization connection.