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Lennox Central Air Merit Series

I simply want to know how to add bleach to drain line to keep if free of baterial build up. The is a red hex plug in one side and solid PVC on the other. Do I remove plug and add bleach there?

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No,There should be a tee in the line with the opening on top for you to pour bleach.If not,you can cut the line and add a coupling with only 1 side glued.

Posted on Jul 29, 2008


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Your drain line is probably clogged. If you have shop vac, you can attach it to the drain outside. You may have to use tape to get a good seal and then use it to clear the clog. Also look in the air handler and see if there is a lot of build up in the pan under the coil. You can put a little Clorox bleach in the line a couple of times a year to help keep the drain line clear. Let me know if this helps.

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Make sure your condensate drain is clear of algae and other things that can clog the drain line plumbing. This can also lead to hard to control mold and mildew problems inside. Take a "wet or dry" shop vac to the end of the condensate drain line and vacuum out whatever is in the line until it is clear. The drain should flow well and not a occasional drip.

To control the build up of this gunk, about once a month, pour a cup of white vinegar into the drain line near the beginning of the line and the acidity of the vinegar will kill and prevent the regrowth of the drain clogging gunk without harming the environment outside.

If you still have problems, find and reduce sources of humidity inside the building. If the AC is too large for the building, it can fail to run long enough to extract moisture. If the blowers are partly in a hot space and partly in the cool room, the colder setting can cause the humidity to condensate on it as it does naturally in the AC unit and in our weather.

Hope this helps you get started. If not, consult your local HVAC company. See if you have an ARS service near you.

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1 Answer

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Sounds like ether you have a plugged condensate drain,or the drain pan is rusted out.If it it clogged you can squire a bit of water through to unclogg.If it is rusted youll have to wait it out.Good luck.

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Grab a small goldfish strainer / net and scoop out the moldy chunks.

Keep cycling the water until most of the chunks are gone.

Drain the rub, refill and add 1/2 cup bleach again, repeating the process.

The problem is caused by water left in the lines after use, and it turns moldy.

After each use...drain the tub completely, then turn on the jets for about 10 seconds. This will purge the lines of any standing water.

Fill the tub with clean water and cycle the jets with bleach once a week to prevent any further problem.

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The song "knock three times , on the ceiling if you need meeeee! This sounds like a slow drain or plugged drain line, just reverse the water flow with a water hose or preassure! (last if its an old system over 20 yrs old you could have a rusted drain pan. try introducing bleach into the system (clorox)!............Thank-you very much!

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