Refrigeration & Air Conditioning Mechanic Red Seal · Question
When brazing refrigeration tubing, what safety precaution is essential to prevent internal oxidation?
Purging with nitrogen displaces oxygen, preventing the formation of copper oxides (scale) inside the tubing during brazing.
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Question: When brazing refrigeration tubing, what safety precaution is essential to prevent internal oxidation?
Answer options:
- Using a high-temperature flame ✅ Purging with nitrogen
- Cooling the joint rapidly after brazing
- Using a flux containing silver
Correct answer: Purging with nitrogen
Explanation: Purging with nitrogen displaces oxygen, preventing the formation of copper oxides (scale) inside the tubing during brazing.
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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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