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Old 03-10-2020, 11:13 AM   #16
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Re: P-trap questions on HVAC systems. Steps to take prior to Cooling Season


I have never seen a job with the trap at the end of the line. Usually it is at the air handler/indoor unit.

However attic units are very rare where I am in Canada.

If it was my unit I would want the trap at the indoor unit and maintain it there.

Once again I don't see a lot of attic units like in Florida or Texas etc so there must be different ways to drain and trap them.

Vacuuming them out does not clear out the bacteria, it just unclogs them.

I like to flush the entire line from the indoor unit out with bleach. Lines where I am sit for 8 months with no use and stagnant water and bacteria grows in them and clogs them unless they have really good slope and drainage.
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Old 03-10-2020, 11:27 AM   #17
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Re: P-trap questions on HVAC systems. Steps to take prior to Cooling Season


That's how all the homes in my neighborhood are plumbed here in SC in our new neighborhood.....the attic unit condensate drain runs down within the outside wall of the house...and exits near grade level with an appropriately sized and configured trap there at the exit. That trap uses normal PVC pipie and socket fittings that aren't glued....making them removable to check for obstruction and for cleaning. The trap is not at the origination-connecting point to the unit in the attic. I see now (I guess) what you're suggesting..... that the trap, either field-built or EZ trap....is to beinstalled at the attic unit. The EZ trap has access caps where you can clean and add bleach. If done here....the bleach can continue to drain to the outside and all the piping would be contacted by the bleach and later water flush... got it. Thanks.
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Old 03-10-2020, 11:32 AM   #18
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Re: P-trap questions on HVAC systems. Steps to take prior to Cooling Season


Thats a big 10-4 Good Buddy.
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Old 03-10-2020, 11:42 AM   #19
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Re: P-trap questions on HVAC systems. Steps to take prior to Cooling Season


Thanks again....
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Old 03-10-2020, 11:57 AM   #20
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Re: P-trap questions on HVAC systems. Steps to take prior to Cooling Season


Yur Welcome
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Old 03-10-2020, 12:16 PM   #21
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Re: P-trap questions on HVAC systems. Steps to take prior to Cooling Season


Quote:
Originally Posted by IPSC View Post
@ cheeno.... for your furnace to produce a lot more water during the heating cycle compared to cooling...the only way this makes sense is if your furnace is a high-efficiency gas burning furnace, that has a secondary condensing heat exchanger in the design that draws out moisture to reduce flue temps.
Otherwise, that would make no sense ....... cold air cannot hold moisture as well as hot air, and the A/C cycle will be the only one that produces condensate...as is the case for an electric heating/Aircon system that I mention is what I have. Just trying to clarify....

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American Standard Freedom 90 Two-Stage Furnace


More condensate during heating season as mentioned.


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Old 03-10-2020, 12:27 PM   #22
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Re: P-trap questions on HVAC systems. Steps to take prior to Cooling Season


@ cheeno... no problem, just saying that from basic physics and thermal characteristics...this won't happen in heating season unless there is a high-efficiency gas furnace involved ( that typically uses a secondary condensing heat exhanger to create low flue temps and high heat recovery). From your description.....this seems indeed to be the case... a google search on the model you mention shows this--->
https://www.franksheating.com/webapp...0E3E7C8612B%7D... titled " Condensing Gas Furnaces"
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