Refrigerant Line Length / Charge Adjustment Calculator
Estimate additional refrigerant charge for line sets longer than the manufacturer baseline using a simple per-foot adjustment factor, with results shown in ounces and grams.
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Frequently asked questions
What does a refrigerant line length charge adjustment calculator do?
It estimates how much additional refrigerant charge may be needed when the installed line set is longer than the baseline length included by the equipment manufacturer.
What formula does this calculator use?
The calculator uses extra length = max(actual length minus baseline length, 0), then charge adjustment = extra length multiplied by the adjustment factor in ounces per foot.
Where do I get the adjustment factor?
Use the manufacturer installation instructions or service manual for the exact refrigerant type, line size, and charge factor for the equipment you are working on.
Can I use this instead of the manufacturer charging procedure?
No. This is a field estimate and sanity-check tool. Final charging should always follow the manufacturer procedure, including superheat, subcooling, weigh-in, and commissioning requirements.
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