Refrigeration & Air Conditioning Mechanic Red Seal · Question
According to Canadian regulations, what is the maximum permissible concentration of refrigerant in the atmosphere of a machinery room where refrigerants are stored or used?
The maximum permissible concentration is based on the refrigerant's specific TWA (Time Weighted Average) or STEL (Short Term Exposure Limit) limits to ensure sa
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Question: According to Canadian regulations, what is the maximum permissible concentration of refrigerant in the atmosphere of a machinery room where refrigerants are stored or used?
Answer options: ✅ Determined by the refrigerant's TWA or STEL limit
- 0 ppm (parts per million)
- 100 ppm
- 500 ppm
Correct answer: Determined by the refrigerant's TWA or STEL limit
Explanation: The maximum permissible concentration is based on the refrigerant's specific TWA (Time Weighted Average) or STEL (Short Term Exposure Limit) limits to ensure safety.
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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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