FAB-101 EPA Week 5 Homework (Type III)

What is the maximum test pressure for leak testing a low-pressure centrifugal chiller with nitrogen?

• 5 psig

• 10 psig

• 15 psig

• 20 psig

How can charged low-pressure refrigeration machines be most effectively leak checked?

• By adding refrigerant

• By reducing pressure

• By adding heat with hot water or heating blankets

• By cooling the system

What type of compressors are particularly susceptible to leaks from the shaft seal?

• Open-drive type compressors

• Closed-drive type compressors

• Rotary compressors

• Scroll compressors

According to ASHRAE Guideline 3, when should a system be checked for leaks?

• If pressure rises from 1 mm Hg to 2.5 mm Hg

• If pressure drops from 2.5 mm Hg to 1 mm Hg

• If temperature increases

• If refrigerant levels decrease

What happens once the threshold leak rate has been exceeded on a system using a regulated refrigerant?

• The system must be replaced

• The system must be repaired

• The refrigerant must be removed

• The refrigerant must be increased

As of January 1, 2019, what is the maximum leak rate for comfort cooling?

• 10% of the charge per year

• 20% of the charge per year

• 30% of the charge per year

• 40% of the charge per year

How long does an owner have to repair an appliance that has 50 pounds or more of refrigerant and has exceeded the threshold leak rate?

• 10 days

• 18 months

• 30 days

• 3 years

What is the typical high-pressure cut-out control setting for a low-pressure chiller?

• 0 psig

• 5 psig

• 10 psig

• 15 psig

What is the deadline for conducting an initial verification test after a chiller with 200 pounds of refrigerant passes the initial leak test?

• 5 days

• 10 days

• 15 days

• 20 days

What should be done to refrigerant oil before removal to ensure less refrigerant is contained in the oil?

• Cool it to 32°F

• Heat it to 130°F

• Freeze it to 0°F

• Boil it to 212°F