R407C Lineset Charge — 3/8" Line, 60 ft
How This Was Calculated
Additional charge = (lineset length - factory charge length) × charge rate per foot. Rate for R407C at 3/8": 0.5 oz/ft.
- Length_ft
- Actual lineset length: 60 ft
- Factory_ft
- Factory pre-charge length: 0 ft
- Rate_oz_per_ft
- R407C 3/8" charge rate: 0.5 oz/ft
- Charge_oz
- Additional charge: 30 oz
Important Considerations
Charge-per-foot values shown are general reference estimates based on typical published data. Always refer to the specific equipment installation manual for the exact charge rate for your system model. Charge rates vary by manufacturer, compressor type, and system design. Incorrect charging — over or under — reduces efficiency and can cause compressor failure.
Additional lineset charge should be added after verifying factory charge is complete. The most accurate method for variable refrigerant systems is weighing in charge on a calibrated scale. For fixed-orifice systems, superheat and subcooling measurements verify total system charge after adding lineset correction. Never charge by pressure alone — always use superheat/subcooling as a final verification.
Most residential split systems have a published maximum lineset length (typically 50–100 ft horizontal equivalent). Exceeding this limit requires manufacturer-approved correction procedures beyond simple charge addition, including verification of oil return velocity, suction line sizing, and trap installation. Check the equipment specification sheet for maximum allowable lineset length before installation planning.
Charge-per-foot values derived from major manufacturer installation manuals (Carrier, Lennox, Trane, Goodman). Actual charge rates vary by manufacturer and system model. Always refer to the specific equipment installation manual for exact charging instructions. Factory charge length is typically 15 ft (window/PTAC) or 25 ft (split systems).