Refrigeration & Air Conditioning Mechanic Red Seal · Question
A newly installed refrigeration system utilizing R-717 (ammonia) is being commissioned in a food processing facility. CSA B52 requires a refrigerant detection system to be installed in the machinery room. What is the maximum alarm setpoint for this detection system, as a percentage of the lower flammable limit (LFL)?
For Group 2 refrigerants like R-717, CSA B52 Section 8.11.3 requires that the alarm for the refrigerant detection system in a machinery room must be set to acti
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Question: A newly installed refrigeration system utilizing R-717 (ammonia) is being commissioned in a food processing facility. CSA B52 requires a refrigerant detection system to be installed in the machinery room. What is the maximum alarm setpoint for this detection system, as a percentage of the lower flammable limit (LFL)?
Answer options: ✅ 10% LFL
- 25% LFL
- 50% LFL
- 100% LFL
Correct answer: 10% LFL
Explanation: For Group 2 refrigerants like R-717, CSA B52 Section 8.11.3 requires that the alarm for the refrigerant detection system in a machinery room must be set to activate at a concentration not exceeding 10% of the lower flammable limit (LFL).
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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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