Condensate Line

Should a condensate line discharge directly into the sewer line?

Thanks, for your input.

no, usually directed to a indirect waste with a 1 inch air gap or according to mfg. installation instructions never directly into a drain (sewer gas):slight_smile:

It can go to an “indirect waste receptor” but I don’t like that direct connection to what looks like the washing machine waste pipe. Also, there appears to be a sag in the line and it should have a continuous downward slope. I’d refer it to a HVAC contractor or plumber. They could add another standpipe and run the drain to it with a continuous slope and it would be OK. The size of the drain should not be less than 3/4 inch.

Here’s a thread that talks about indirect waste receptors.

Not “directly,” and certainly not like that. The connection requires proper fittings, and (as Joe stated) it should be an indirect connection.

I agree with everyone here.

Where’s the trap for the washer waste line?

Thanks! There was no trap on the washer drain line.

It’s required…

The pic is of a indirect condensate drain with a P-trap in the slab. The furnace is a upflow with the drain within the return air plenum behind the filter grill is it right or wrong

An open drain line in the return-air plenum :shock:? Hmmm, let me think about this. . .

Do I smell wood burning:mrgreen::mrgreen: I have to deal with these on a regular basis

I would call it unorthodox and refer it out.

If indeed it is wrong and I am not saying one way or the other why not just state what is wrong and put it on the repair list.

In the 2006 IRC (which is my primary guide) under Heating and Cooling Equipment (M1411), there are very specific instructions for auxiliary/secondary condensate drains, but practically nothing is said about the primary condensate drain for some reason. So I can’t say it’s wrong. But it is certainly ‘unorthodox’. I would let a “specialist” make the decision about whether or not it is wrong.

I don’t know about other areas but here the drain in the first pic is considered legal because of what you see in the second pic a high efficiency furnace which provides a wet trap in the slab during the heat season. The furnace had been recently updated from a 80% furnace. If the 80% furnace had still been in use this drain would be illegal due to no water production in the heat season and the trap in the slab would go dry allowing sewer gas into the air stream of the furnace. I agree it is a dumb place to put a drain but the powers to be allowed them here for years and years but the two inch riser from the slab was suppose to extend above the return air plenum and a lot of contractors did not extend them and I always wrote them up but now days with high efficiency furnaces they become legal.

I’d have a hard time with the acidic condensate from the Upflow Condensing (90%+) Furnace, being piped to an indirect slab drain within the R/A section of the furnace. I’d have a problem with any furnace potentially picking up condensate out of the drain an blending it back into the R/A airflow stream. Either way, a dumb design, I’d write it up too.