#6 EPA 608 Type III

Identify the pressure corresponding to 32°F for R-123.

• 23 inches of Hg vacuum

• 20 inches of Hg vacuum

• 17 inches of Hg vacuum

• 11 inches of Hg vacuum

What is a typical advantage of a water cooled recovery unit?

• Higher pressure at the recovery compressor's discharge.

• Higher pressure in the recovery tank.

• Faster recovery of large quantities of refrigerant.

• Greater percentage of refrigerant recovered.

1. Which of the following statements about R-1233zd is FALSE?

• It is a SNAP approved replacement for low-pressure centrifugal compressor systems.

• It is being considered for applications where R-123 might have been used.

• It is suitable for air conditioning applications where cooling water is used (large chiller applications).

• It is mildly flammable.

Which of the following methods can be used to pressurize an R-1233zd system for the purpose of opening the system for a non-major repair?

• Adding nitrogen to the system.

• Warming the liquid refrigerant in the system.

• Adding compressed air to the system's condenser.

• Adding carbon dioxide to the system's condenser and evaporator

Which of the following statements is true of recycling and recovery equipment?

• It must be tested by an AHRI-approved third party.

• It must be equipped with low-loss ball valves and flare fittings.

• It must be able to handle more than one refrigerant.

• It must be labeled as certified to meet EPA's requirements.

Starting in 2019, what is the leak rate threshold for industrial process refrigeration equipment with a full charge of 50 or more pounds of an HCFC refrigerant?

• 5%

• 10%

• 20%

• 30%

Where is the rupture disc located on a centrifugal chiller?

• Condenser

• Evaporator

• Liquid line

• Economizer

Approximately how much refrigerant vapor is left in an average 350-ton R-123 chiller at 0 psig once all the R-123 liquid has been removed?

• Trace amount

• 50 pounds

• 75 pounds

• 100 pounds

What evacuation level must technicians recover refrigerant to before disposing a low-pressure appliance?

• 0 psig

• 15 inches of Hg vacuum

• 25 inches of Hg vacuum

• 25 mm of Hg absolute

After system servicing, and recharging, why is refrigerant vapor re-introduced to the chiller before refrigerant liquid?

• Vapor charging increases pressure slowly, preventing failure of the rupture disk.

• Vapor charging is faster than liquid charging.

• Liquid charging is more difficult to control than vapor charging.

• Liquid charged into a deep vacuum will evaporate and may lower the temperature freezing water in the heat exchanger tube bundle.