Low-Pressure Refrigeration Systems Quiz

What certification is required for technicians maintaining low-pressure appliances?

• Type IV Technician

• Type I Technician

• Type II Technician

• Type III Technician

What is the primary purpose of a purge unit in a low-pressure chiller system?

• To cool the system

• To add refrigerant

• To remove non-condensables

• To increase refrigerant pressure

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

• 5 psig

• 10 psig

• 15 psig

• 20 psig

What is the maximum allowable leak rate for comfort cooling systems as of January 1, 2019?

• 20% per year

• 40% per year

• 10% per year

• 30% per year

What should be done if a low-pressure refrigeration system's leak rate exceeds the threshold?

• Ignore the leak

• Increase refrigerant charge

• Replace the refrigerant

• Repair, retrofit, or retire the appliance

What is the typical setting for the high-pressure cut-out control on a recovery unit for low-pressure chillers?

• 15 psig

• 10 psig

• 20 psig

• 5 psig

What is the purpose of circulating water through a chiller during refrigerant recovery?

• To prevent freezing of water

• To increase refrigerant pressure

• To cool the refrigerant

• To add refrigerant

What should be done before disposing of a low-pressure appliance?

• Add more refrigerant

• Recover or evacuate refrigerant to 25 mm of Hg absolute

• Increase system pressure

• Replace the compressor

What is the consequence of using a severely oversized vacuum pump during system evacuation?

• Increased refrigerant pressure

• Trapped water may freeze

• Faster refrigerant recovery

• Increased system temperature

What action is required if the TLV-TWA is exceeded in a machinery room?

• Add more refrigerant

• Shut down the system

• Activate an alarm and ventilation system

• Increase refrigerant charge