Refrigeration & Air Conditioning Mechanic Red Seal · Question
Following a major repair involving opening the refrigerant circuit on a commercial air conditioning unit, what is the recommended minimum evacuation level (deep vacuum) that should be achieved and held as per CSA B52 mechanical refrigeration code for systems using R-410A?
The CSA B52 mechanical refrigeration code, consistent with industry best practices for HFC refrigerants like R-410A, specifies that a vacuum of at least 250 mic
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Question: Following a major repair involving opening the refrigerant circuit on a commercial air conditioning unit, what is the recommended minimum evacuation level (deep vacuum) that should be achieved and held as per CSA B52 mechanical refrigeration code for systems using R-410A?
Answer options:
- 5000 microns (5.0 mmHg) ✅ 250 microns (0.25 mmHg)
- 1000 microns (1.0 mmHg)
- 760000 microns (760 mmHg)
Correct answer: 250 microns (0.25 mmHg)
Explanation: The CSA B52 mechanical refrigeration code, consistent with industry best practices for HFC refrigerants like R-410A, specifies that a vacuum of at least 250 microns (0.25 mmHg) must be achieved and held to ensure effective removal of moisture and non-condensable gases.
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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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