Refrigeration & Air Conditioning Mechanic Red Seal · Question
A new refrigerant, R-X, has an AEL of 500 ppm. According to CSA B52, what is the maximum concentration at which a refrigerant detector for R-X should trigger a low-level alarm in a machinery room?
CSA B52 requires the alarm to activate at a concentration not exceeding 25% of the refrigerant's AEL. Therefore, 500 ppm * 0.25 = 125 ppm.
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Question: A new refrigerant, R-X, has an AEL of 500 ppm. According to CSA B52, what is the maximum concentration at which a refrigerant detector for R-X should trigger a low-level alarm in a machinery room?
Answer options:
- 62.5 ppm ✅ 125 ppm
- 250 ppm
- 500 ppm
Correct answer: 125 ppm
Explanation: CSA B52 requires the alarm to activate at a concentration not exceeding 25% of the refrigerant's AEL. Therefore, 500 ppm * 0.25 = 125 ppm.
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- 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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