Refrigeration & Air Conditioning Mechanic Red Seal · Question
When brazing refrigerant lines, what is the primary purpose of flowing nitrogen through the tubing?
Nitrogen prevents the formation of copper oxide scale inside the tubing, which can contaminate the system.
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Question: When brazing refrigerant lines, what is the primary purpose of flowing nitrogen through the tubing?
Answer options: ✅ To prevent oxidation (scaling) on the inside of the tubing
- To cool the tubing rapidly after brazing
- To purge out any residual refrigerant
- To increase the strength of the braze joint
Correct answer: To prevent oxidation (scaling) on the inside of the tubing
Explanation: Nitrogen prevents the formation of copper oxide scale inside the tubing, which can contaminate the system.
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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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