Line-Set Length Refrigerant Charge Adder
The extra refrigerant a longer-than-factory line set needs, added to the nameplate base: 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.
Formula and source
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.
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