Pipe installation involves placing copper, PVC, or polyethylene tubing for refrigerant, water, or drainage applications in HVAC systems. Refrigerant pipes require special handling for pressure ratings and contamination prevention, while water pipes handle chilled water in larger systems. All piping must be properly sized, supported, and insulated to prevent efficiency losses and system failures.
Technical Details
Refrigerant pipes use copper tubing with flare or solder connections, sized per EPA guidelines based on tonnage and line lengths. Pressure drop in refrigerant lines must not exceed 2 degrees Fahrenheit equivalent for subcooled liquid or 5 degrees for superheated vapor. All copper lines require nitrogen purging during brazing to prevent oxidation. Condensate drain pipes slope minimum 1/4 inch per 12 feet to ensure proper drainage and prevent mold growth.
Practical Significance
Correct pipe sizing and installation maintains refrigerant velocity and system efficiency. Improperly sized pipes cause compressor oil return problems and reduce capacity by 5 to 10 percent. Quality installation prevents leaks that release refrigerants and harm the environment.