Refrigeration & Air Conditioning Mechanic Red Seal · Question
Which material is NOT generally compatible with R-290 (Propane) refrigerant systems?
Flexible PVC tubing is not suitable for R-290 systems due to its flammability, permeability, and potential for degradation.
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Question: Which material is NOT generally compatible with R-290 (Propane) refrigerant systems?
Answer options:
- Copper
- Aluminum
- Brass ✅ Flexible PVC tubing
Correct answer: Flexible PVC tubing
Explanation: Flexible PVC tubing is not suitable for R-290 systems due to its flammability, permeability, and potential for degradation.
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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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