Refrigerant Pipes

Function

- Transmit refrigerants to achieve heat exchange between indoor and outdoor units.

- High-pressure pipes carry high-temperature, high-pressure refrigerant gas; low-pressure pipes carry low-temperature, low-pressure refrigerant liquid.

Materials

1. Copper Tubes

- Advantages: Excellent thermal conductivity, corrosion resistance, and easy to bend. Widely used in most AC systems.

- Types: Regular copper tubes (for household AC) and degreased copper tubes (for high-precision inverter systems).

2. Aluminum-Plastic Composite Tubes

- Advantages: Lightweight, low cost, and vibration-resistant. Suitable for specific applications (e.g., central AC branch pipes).

Installation Tips

- Insulation: Wrap pipes with rubber-plastic insulation (thickness ≥9mm) to prevent condensate and energy loss.

- Leakage Prevention: Use flared connections or welding; purge pipes with nitrogen and test pressure (≥2.8MPa).

- Routing: Avoid excessive bending (bend radius ≥4×pipe diameter); maintain a 1% slope for horizontal pipes (toward the outdoor unit).

Maintenance

- Check insulation for damage and pipes for abnormal frost/condensation (may indicate leaks or blockages).

- Test outdoor pipe joints for leaks (apply soapy water to check for bubbles).

Condensate Drain Pipes

Function

- Drain condensate water from the indoor unit's evaporator to prevent water leakage.

Materials

- PVC pipes (corrosion-resistant, for household AC) and galvanized steel pipes (high-strength, for commercial systems).

Installation Tips

- Slope: Maintain a slope of ≥3% for horizontal pipes to ensure smooth drainage.

- Anti-backflow Design: Install a "U-shaped water trap" to prevent air backflow when connecting to main drains.

- Testing: Conduct a water flow test after installation to check for blockages.

Maintenance

- Clean pipes regularly to remove debris and algae (use specialized cleaners).

- Inspect drain pumps (if installed) for proper operation to avoid water accumulation.