Evacuating Refrigeration Systems Quiz

What is the primary purpose of evacuating a refrigeration system before charging?

• To increase the system's pressure

• To prevent early equipment failure and ensure proper system operation

• To add more refrigerant to the system

• To clean the system's exterior

What is the boiling point of water at atmospheric pressure?

• 212°F

• 32°F

• 100°F

• 0°F

What is the minimum acceptable range of microns for evacuation according to ASHRAE?

• 100-200 microns

• 500-1000 microns

• 2000-3000 microns

• 50-100 microns

What is the theoretical state that cannot be achieved in a vacuum?

• Total isolation

• Complete dehydration

• Perfect vacuum

• Absolute zero

What tool is used to measure both positive and negative pressure in refrigeration systems?

• Pressure cooker

• Barometer

• Compound gauge

• Digital thermometer

What is the function of a gas ballast in a vacuum pump?

• To increase the pump's speed

• To allow moisture to be pushed out of the pump

• To decrease the pump's noise

• To add refrigerant to the system

What is the typical micron target for new larger installations without issues?

• Below 500 microns

• Below 100 microns

• Below 1000 microns

• Below 200 or 300 microns

What is the purpose of a decay test during evacuation?

• To check the system's refrigerant level

• To ensure the system is leak-free

• To test the system's electrical components

• To measure the system's temperature

What is the effect of adding heat to a system during evacuation?

• It increases the system's refrigerant level

• It decreases the system's pressure

• It reduces the vacuum requirement for moisture to evaporate

• It increases the vacuum requirement

What is the recommended action if a vacuum pump cannot achieve the required micron value?

• Change the vacuum pump oil

• Replace the entire system

• Increase the system's pressure

• Add more refrigerant