Max depth of condensate trap

Every other primary condensate line has multiple traps, this one has three. Obviously I don’t like that, but what about the trap depth. My understanding is a p-trap should be no greater than 4" depth, but what about a condensate trap? Is there a simple way to figure this or does it require in depth calcs of the blower and unit sizing? The photos are all the same line.

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I hope you also called out the direct tap to the sink drain.

I occasionally see 2 traps, which I thought was improper.
But here’s a good article about a vent being needed between multiple traps…
Which begs to question, why even have 2 traps?

The AHJ wants the condensate to terminate at the washer box or into the sink drains like they did here. From what I’ve seen this is ok as long as it is prior to the trap. They’ve been doing this for years here, but literally every one has two or three traps minimum. I’m not sure how they can calculate the trap size properly if they are just using the sink trap or of course installing several. Maybe because these traps are less likely to dry out? If you have any info otherwise please let me know. -Thanks

Interesting. I’ve always thought it had to be to an air gap regardless.

That article I posted mentions that the air between each trap can cause a vacuum, and cause it to drain slower,

Would like to hear from an hvac professional as well…

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I guess they do not mind s-traps either :man_shrugging:

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I don’t disagree with you at all. There’s a lot I disagree with the AHJ here. This would be an “air break” by my understanding and not an “air gap.” I’m just hoping to learn a little more on this setup, especially with the traps. The AHJ approves all of this, but of course that doesn’t mean it’s right. Hell, I called out 2040 windows for egress in bedrooms and the AHJ said it’s ok (edit to note this was new construction). Sure makes it hard sometimes.


lol, maybe this one is better!

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