Brazing and Pressure Testing in Air Conditioning Installation

The video tutorial covers the setup and brazing process of an HVAC system. It begins with setting up the outdoor unit and removing the Schrader valves. Nitrogen is flowed through the system to prevent oxidation during brazing. The tutorial then moves indoors to demonstrate brazing the suction and liquid lines, emphasizing safety precautions such as removing the TXV bulb and using a wet rag to prevent overheating. The video concludes with final brazing steps and safety tips to avoid triggering smoke alarms.

What is the first step after setting the outdoor unit?

• Removing the Schrader valves

• Covering smoke detectors

• Flowing nitrogen through the system

• Brazing the suction line

What should be done with the Schrader valves during brazing?

• Leave them in place

• Remove and set aside

• Cool them with water

• Replace with new ones

At what pressure is nitrogen flowed through the system?

• 10 psi

• 100 psi

• 3 psi

• 50 psi

What is the purpose of flowing nitrogen through the system?

• To cool down the system

• To test the system's integrity

• To remove oxygen and prevent oxidation

• To increase system pressure

What indicates the pressure at which nitrogen is flowing out of the flow meter?

• The temperature of the flow meter

• The sound it makes

• The position of a floating ball

• The color of the nitrogen

What is the main reason for using nitrogen during the brazing process?

• To increase the heat

• To clean the pipes

• To prevent oxidation inside the pipes

• To test the system for leaks

Where should the filter dryers be installed in the system?

• Outside the house

• Inside the house

• At the outdoor unit

• Near the nitrogen bottle

Why is it important to remove the TXV bulb before brazing?

• To improve the flow of nitrogen

• To prevent nitrogen leakage

• To make brazing easier

• To avoid damaging it with heat

What is used to cool the brazed area immediately after brazing?

• Nitrogen gas

• A wet rag

• Cold water

• A dry rag

What should be done if smoke detectors are present in the area where brazing is performed?

• Disconnect them

• Cover them with a plastic cover

• Leave them as they are

• Spray them with water