Refrigeration & Air Conditioning Mechanic Red Seal · Question
Upon completing a compressor replacement on a supermarket refrigeration rack, a technician evacuates the system to 750 microns. What is the primary reason for achieving such a deep vacuum before recharging?
Achieving a deep vacuum below 1000 microns is critical to remove non-condensable gases (like air and nitrogen) and moisture from the system. Moisture, if left i
Start free practice for Refrigeration & Air Conditioning Mechanic Red Seal
500 questions · no signup required · 40 free questions per day
Question: Upon completing a compressor replacement on a supermarket refrigeration rack, a technician evacuates the system to 750 microns. What is the primary reason for achieving such a deep vacuum before recharging?
Answer options: ✅ To ensure all non-condensable gases, primarily air and moisture, are removed from the system.
- To verify that the system is completely leak-free under negative pressure.
- To prevent any residual oil from contaminating the new compressor.
- To facilitate faster refrigerant charging by creating a pressure differential.
Correct answer: To ensure all non-condensable gases, primarily air and moisture, are removed from the system.
Explanation: Achieving a deep vacuum below 1000 microns is critical to remove non-condensable gases (like air and nitrogen) and moisture from the system. Moisture, if left in the system, can lead to acid formation, restricted expansion devices, and compressor burnout.
Start free practice for Refrigeration & Air Conditioning Mechanic Red Seal
500 questions · no signup required · 40 free questions per day
More about Refrigeration & Air Conditioning Mechanic Red Seal
Related Questions
- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
- According to the Canadian Electrical Code (CEC), what is the minimum required working clearance in front of el
- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
- Which type of electric motor requires a capacitor for starting and running, offering higher efficiency and bet
- When evacuating a refrigeration system, what is the recommended deep vacuum level, typically measured in micro
More for Refrigeration & Air Conditioning Mechanic Red Seal candidates
FAQs
Question explanations
- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
- According to the Canadian Electrical Code (CEC), what is the minimum required working clearance in front of el
- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Refrigeration & Air Conditioning Mechanic Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.