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Home / Calculators / Line Set Refrigerant Charge Addition
Refrigeration & Diagnostics โœ“ ISO/ASHRAE Thermodynamic Math โ€ข Calibrated for 42ยฐC Tropical Ambient

Line Set Refrigerant Charge Addition

Calculate exact grams and ounces of refrigerant to weigh in for split AC and VRF systems with extended pipe runs beyond factory charge.

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Extra Gas to Weigh In
400 grams (0.40 kg)
14.1 oz Virgin Refrigerant
Factory pre-charge covers first 15 feet (5m). Always weigh in with digital scale.
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Governing Formula:
Additional Refrigerant = (Total Line Length - Factory Precharged Length) ร— Rate per Foot
Pune Field Notes & Environmental Standards:

Standard factory charge covers 15 ft (5m). Extra liquid line requires ~15g/ft for 1/4" and ~20g/ft for 3/8" OD.

Technical Engineering Guide & Field Diagnostic Practices

Air conditioner outdoor condensing units come pre-charged from the factory for a standard piping length (typically 15 to 25 feet). Whenever piping length exceeds factory limits, additional virgin refrigerant must be weighed in using a digital scale to prevent evaporator starvation and compressor overheating.

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