Refrigeration & Air Conditioning Mechanic Red Seal · Question
A refrigeration machinery room contains equipment with 200 kg of R-744 (CO2). As per CSA B52 guidance, what type of refrigerant detection system is primarily needed for worker safety in this room?
R-744 (CO2) is a non-flammable, non-toxic refrigerant at low concentrations, but it is an asphyxiant. Thus, the primary hazard is oxygen displacement. CSA B52 S
Start free practice for Refrigeration & Air Conditioning Mechanic Red Seal
500 questions · no signup required · 40 free questions per day
Question: A refrigeration machinery room contains equipment with 200 kg of R-744 (CO2). As per CSA B52 guidance, what type of refrigerant detection system is primarily needed for worker safety in this room?
Answer options:
- A halogen leak detector to pinpoint small leaks.
- A combustible gas detector to monitor flammability. ✅ A oxygen depletion or CO2 specific detector to monitor asphyxiation hazards.
- An ultrasonic leak detector to identify pressure drops.
Correct answer: A oxygen depletion or CO2 specific detector to monitor asphyxiation hazards.
Explanation: R-744 (CO2) is a non-flammable, non-toxic refrigerant at low concentrations, but it is an asphyxiant. Thus, the primary hazard is oxygen displacement. CSA B52 Section 8.11.3 specifies that CO2 detection systems must activate an alarm at the TLVW-TWA (5000 ppm) or when 18% oxygen depletion occurs.
Start free practice for Refrigeration & Air Conditioning Mechanic Red Seal
500 questions · no signup required · 40 free questions per day
More about Refrigeration & Air Conditioning Mechanic Red Seal
Related Questions
- 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
- Which type of electric motor requires a capacitor for starting and running, offering higher efficiency and bet
- When evacuating a refrigeration system, what is the recommended deep vacuum level, typically measured in micro
More for Refrigeration & Air Conditioning Mechanic Red Seal candidates
FAQs
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
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Refrigeration & Air Conditioning Mechanic Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.