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Refrigerant Pipe Size Calculator
Determine the correct liquid and gas line pipe diameters for your split AC system based on cooling capacity and refrigerant type. Correct pipe sizing ensures proper oil return and system performance.
How to Size Refrigerant Pipes
Refrigerant pipe sizing depends on the cooling capacity, refrigerant type, and allowable velocity. Pipes that are too small cause excessive pressure drop and oil return problems; pipes that are too large reduce gas velocity below the minimum needed for oil return.
Always use the manufacturer's specified pipe sizes for your model. This calculator provides general guidance based on common industry practice.
Frequently Asked Questions
What happens if the refrigerant pipe is too small?
Undersized pipes cause high pressure drops, reduced capacity, and poor oil return to the compressor, which can lead to compressor failure.
What happens if the pipe is too large?
Oversized gas lines reduce refrigerant velocity below the minimum needed for oil return (typically 4 m/s), causing oil to pool in the evaporator and starving the compressor of lubrication.
Can I use different pipe sizes than the manufacturer specifies?
No. Always use the exact pipe sizes specified by the manufacturer. Different sizes change the system's pressure drops and charge requirements, potentially voiding the warranty.
Refrigerant Pipe Size Calculator
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