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WorksheetsLow-Pressure Refrigeration Systems Quiz
Total questions: 14
Worksheet time: 7mins
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
What is the most effective way to leak test a charged low pressure chiller?
Use controlled hot water or electric heating blankets to increase system pressure
Use cold water and ice decrease system pressure
Add nitrogen to the system
Use an open flame to speed up the system
What is the purpose of EPA 608 certification?
To regulate the sale of refrigerants
To reduce greenhouse gas emissions
To ensure proper disposal of refrigerants
To test technicians' knowledge of refrigerants
What do low pressure appliances require since they operate below atmospheric pressure?
A condenser
A pressure relief valve
A process stub
A purge unit
What is the pressure relief device on a low-pressure chiller called?
A purge unit
A rupture disc
A vent pipe
An evaporator valve
