Common leak locations are?

• A. Coils
• B. Valve connections
• C. Pipe connections
• D. Coils, valve connections, pipe connections

Answer: (D)

Leaks most often occur at joints and connections in a system, and at components where the refrigerant travels, such as coils. Coils can develop leaks from pinholes, corrosion, or damage in the tubing or headers. Valve connections can leak through packing glands, O-rings, gaskets, or loose fittings. Pipe connections are prone to leaks at threaded joints, brazed or soldered joints, unions, and flanges. Because each of these areas represents a common weak point where pressure, vibration, and thermal cycling stress seals and fittings, all three locations are frequent leak sites. That’s why listing coils, valve connections, and pipe connections together best reflects where leaks are typically found.