Condensate Rate and Drain Size
The gallons per hour a coil sheds from the tonnage, the minimum drain-line size by IMC 307.2.2, and the fall over a run at the code slope. The per-ton rate is an editable field estimate, since condensate tracks the latent load.
Formula and source
rate_gph = tons x pints_per_ton_hr / 8. Drain size by IMC 307.2.2 capacity steps (3/4 in to 20 tons, then 1, 1-1/4, 1-1/2, 2 in). fall = run x slope (>= 1/8 in/ft per 307.2.5).
IMC 307.2.2 (drain size by capacity) and 307.2.5 (slope) (by name).
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