Refrigeration & Air Conditioning Mechanic Red Seal · Question
A technician is installing a new split air conditioning system and prepares to braze the liquid line. What is the maximum recommended pressure for the nitrogen flow during brazing to effectively purge the internal tubing without causing excessive turbulence or cooling?
During nitrogen purging for brazing, a very low positive pressure of approximately 5 kPa (0.7 psi) or 2-3 SCFH is sufficient to prevent oxidation. Higher pressu
Start free practice for Refrigeration & Air Conditioning Mechanic Red Seal
500 questions · no signup required · 40 free questions per day
Question: A technician is installing a new split air conditioning system and prepares to braze the liquid line. What is the maximum recommended pressure for the nitrogen flow during brazing to effectively purge the internal tubing without causing excessive turbulence or cooling?
Answer options: ✅ 5 kPa (0.7 psi)
- 20 kPa (2.9 psi)
- 100 kPa (14.5 psi)
- 500 kPa (72.5 psi)
Correct answer: 5 kPa (0.7 psi)
Explanation: During nitrogen purging for brazing, a very low positive pressure of approximately 5 kPa (0.7 psi) or 2-3 SCFH is sufficient to prevent oxidation. Higher pressures are unnecessary and can cause excessive cooling, making brazing more difficult, or lead to gas turbulence that is less effective for purging.
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.