Plumbing codes

[Al_G.Liminator]

I’ve read many posts concerning A/C drain lines. Some folks say it is not legal to run the drain lines into a sewer vent line in the attic. Lots of folks post that their lines are running into a vent line. I know what the pro’s and con’s are but the plumbing codes must vary between states. Here in Louisiana the codes must allow the drain to go into a vent line. How many other southern states allow this? I know that it may only be allowed in the north with a certain type of heater and that the p-trap water evaporates but what do the codes say?

[escanlan (Emmanuel Scanlan, TREC# 7593)]

@Al G. Liminator

I’ve read many posts concerning A/C drain lines. Some folks say it is not legal to run the drain lines into a sewer vent line in the attic. Lots of folks post that their lines are running into a vent line. I know what the pro’s and con’s are but the plumbing codes must vary between states. Here in Louisiana the codes must allow the drain to go into a vent line. How many other southern states allow this? I know that it may only be allowed in the north with a certain type of heater and that the p-trap water evaporates but what do the codes say?

2003 IRC

M1411.3 Condensate disposal.
Condensate from all cooling coils or evaporators shall be conveyed from the drain pan outlet to an approved place of disposal. Condensate shall not discharge into a street, alley or other areas so as to cause a nuisance.

P3101.3 Use limitations.
The plumbing vent system shall not be utilized for purposes other than the venting of the plumbing system.

For special provisions in your area check www.municode.com and your local AHJ.