Refrigeration & Air Conditioning Mechanic Red Seal · Question
What is the main safety concern when working with R-744 (CO2) refrigerant systems?
CO2 refrigeration systems operate at significantly higher pressures than traditional systems, requiring specialized components and safety procedures.
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Question: What is the main safety concern when working with R-744 (CO2) refrigerant systems?
Answer options: ✅ Extremely high operating pressures
- Flammability hazards
- Ozone depletion
- Toxicity at low concentrations
Correct answer: Extremely high operating pressures
Explanation: CO2 refrigeration systems operate at significantly higher pressures than traditional systems, requiring specialized components and safety procedures.
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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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