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Old 07-15-2020, 10:38 PM   #1
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Drain Line | HVAC | Cleaning


Hey all,

I have an HVAC and I'm 3 years into use and it's probably time (over time) that I clean the drain line.

There's an image attached.

I'm wondering about best practice to clean this drain line?

The opening ("1" in the photo) is where I'd expect to lightly blow and put cleaning solution in but, how in the heck do I reach the elbow ("2" in the photo)??? It's on a 90 degree from the open topped pipe.

Tips and recommendations please! Thanks. ))

P.S. That "Open Top" isn't capped off ... should it be???


Last edited by vitamin; 07-15-2020 at 10:48 PM.
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Old 07-16-2020, 08:51 AM   #2
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Re: Drain Line | HVAC | Cleaning


My system has been running more than 16 years without a problem with drain pluggage so I suppose it's dependant on some factors that vary from one installation to the next.

That aside and to address your concerns, I would recommend removing the ell from the dain overflow and replacing it with a tee. Perhaps then adding a length of pvc and fittings to the tee as a riser to make access for a funnel insertion when the time came to flush the drain with some disenfectant. You would then plug the bottom of the tee temporarily and pour the stuff into the riser so it would flow back into the drain pan under the evaporator coils and on out through the connected drain.

As mentioned, it may not actually be necessary but chicken soup is always good.

I can't tell clearly from the picture but I hope I see an overflow pan with a switch mechanism that shuts down the system when the coil drain pan overflows.
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Ah, but I was so much older then...I'm younger than that now

Last edited by surferdude2; 07-16-2020 at 08:54 AM.
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Old 07-16-2020, 02:20 PM   #3
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Re: Drain Line | HVAC | Cleaning


Replace the 90 degree elbow above the P-trap with a T. or if you are lazy like me, simply drill a hole on the top of the 90 degree elbow, tape it after the cleaning.
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Old 07-16-2020, 09:56 PM   #4
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Re: Drain Line | HVAC | Cleaning


I did not know or think about AC much till I moved to Florida. My first house the AC system was put in by an AC contractor who owned the house and I never had any issues. AC was over 20 years old when I sold house and still working.



The second house 25 years old was a spec built house and the AC system showed it, crappy job, installed by lowest bidder. Anyway one day my wife said there was water dripping from the light in the closet, directly under the air handler in the attic. We have a coal fired plant not hydro so I knew electric was not the problem.


Long story short, I learned about vacuuming out the drain line a couple times a year to keep it clean. Bunch of You tube videos about it.
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Old 07-21-2020, 08:34 AM   #5
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Re: Drain Line | HVAC | Cleaning


Thanks all for the suggestions and insight. Cheers.
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