Refrigeration & Air Conditioning Mechanic Red Seal · Question
An ammonia (R-717) refrigeration machinery room requires a refrigerant detection system. At what concentration level, relative to the AEL (Acceptable Exposure Limit), must the alarm be activated according to CSA B52?
CSA B52 requires that refrigerant detection systems activate an alarm at a concentration not exceeding 25% of the refrigerant's AEL. This ensures early warning
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Question: An ammonia (R-717) refrigeration machinery room requires a refrigerant detection system. At what concentration level, relative to the AEL (Acceptable Exposure Limit), must the alarm be activated according to CSA B52?
Answer options: ✅ Not more than 25% of the AEL
- Not more than 50% of the AEL
- Not more than the AEL
- Not more than twice the AEL
Correct answer: Not more than 25% of the AEL
Explanation: CSA B52 requires that refrigerant detection systems activate an alarm at a concentration not exceeding 25% of the refrigerant's AEL. This ensures early warning for potentially hazardous conditions.
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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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