Refrigeration & Air Conditioning Mechanic Red Seal · Question
When evacuating a refrigeration system, what is the primary purpose of pulling a deep vacuum (e.g., below 500 microns)?
A deep vacuum boils off moisture at low temperatures and removes air, preventing chemical reactions and system performance degradation.
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Question: When evacuating a refrigeration system, what is the primary purpose of pulling a deep vacuum (e.g., below 500 microns)?
Answer options:
- To remove all refrigerant from the system
- To verify the system is leak-free ✅ To remove non-condensable gases and moisture
- To condense any remaining refrigerant vapor
Correct answer: To remove non-condensable gases and moisture
Explanation: A deep vacuum boils off moisture at low temperatures and removes air, preventing chemical reactions and system performance degradation.
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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
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