Line-Set Length Refrigerant Charge Adder
The extra refrigerant a longer-than-factory line set needs, added to the nameplate base.
Example
You enter
- Actual line-set length (ft) 60
- Factory pre-charge length (ft) 15
- Charge rate (oz/ft) 0.6
You get
- Refrigerant to add 27
- Extra (lb) 1.6875
Details, formula, and sources
extra = max(0, actual - factory) x rate (oz/ft). A 60 ft line set on a unit pre-charged for 15 ft, at 0.6 oz/ft, needs 27 oz (1.69 lb) added; a run at or under the factory length adds nothing, and a 100 ft run adds 51 oz. The rate and factory length come from the nameplate; getting it wrong is a low-capacity callback. The total is weighed in.
extra_oz = max(0, lineset_length_ft - factory_charge_length_ft) x rate_oz_per_ft; extra_lb = extra_oz / 16.
Line-set charge-adder identity by name (extra past the factory pre-charge length, at a per-foot rate); first-principles arithmetic.
The linear charge-adder arithmetic is public first-principles; the per-foot rate and factory length come from the equipment nameplate.
Estimate. AHJ and licensed professional govern.
Field names used by the API: lineset_length_ft, factory_charge_length_ft, rate_oz_per_ft, extra_oz, extra_lb
- Per-foot rate from the nameplate; ~0.6 oz/ft for R-410A on a 3/8 in liquid lineequipment nameplate
- Factory length the factory pre-charge line-set length from the nameplate (~15 ft typical)equipment nameplate