Refrigeration & Air Conditioning Mechanic Red Seal · Question
When evacuating a refrigeration system, what is the recommended deep vacuum level, typically measured in microns?
A deep vacuum of 500 microns or less ensures proper dehydration and removal of non-condensable gases from the system.
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Question: When evacuating a refrigeration system, what is the recommended deep vacuum level, typically measured in microns?
Answer options: ✅ 500 microns or less
- 1000 microns
- 2500 microns
- 5000 microns
Correct answer: 500 microns or less
Explanation: A deep vacuum of 500 microns or less ensures proper dehydration and removal of non-condensable gases from the system.
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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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