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  1. #1
    Join Date
    Aug 2008
    Location
    San Clemente, CA
    Posts
    1,423
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    How "not" to install a condensate drain line

    No trap clean-out, no vent. This drain deserves an "F". It can "Air Lock" because there is no vent after the trap. With no overflow safety switch, no clean-out and no vent one is just asking for several thousand dollars of damage due to condensate water backing up and overflowing the cooling coil drain pan flooding out this interior furnace closet. I was giving an estimate to replace this system as it was not operating, but had it been operating and this was a service call I would have not left it running in this condition. I would have made corrections unless the customer refused to and signed off on this statement.

    "Install not up to industry or manufacturer standards, not responsible for any water damage due to installation conditions."

    How many years has this been like this? 20 or so and no one sees this? What an industry. I think plumbers know they need to vent drain lines that is like 101 plumbing.



    Water liability now days is such a huge problem with mold and everything else that can happen there is no short cut to how we do it. Per Lennox factory specs I helped to design and illustrate I know how to do it right. Do this and condensate problems will be just about nil as long as you glue up the fittings and properly route the piping. If anyone is questioning the Rubitex insulation around the trap it is because the water in the trap is very cold and the trap would condensate being it is located in unconditioned space. The clean-out tee is one-inch so the Gallo Gun cone fits easily into the tee. See we have thought of everything.

    John




  2. #2
    Join Date
    Jan 2011
    Posts
    1,080
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    Why does it need a trap at all? We seldom trap a coil drain in a positive pressure instance. Fan coil always gets trapped.

  3. #3
    Join Date
    Mar 2002
    Location
    fort walton beach fl.
    Posts
    795
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    Quote Originally Posted by jimmyed View Post
    Why does it need a trap at all? We seldom trap a coil drain in a positive pressure instance. Fan coil always gets trapped.
    Same here. On Gas furnaces I normally just have a T for a vent and clean out.
    http://acfwb.com/

    "The best preparation for good work tomorrow is to do good work today"

  4. #4
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,418
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    I AGREE the local utility makes us do things a normal human would not......what happened to air behind water... worked the last 35 years for me
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  5. #5
    Join Date
    Mar 2019
    Posts
    3
    Post Likes

    T vent for A-Coil

    Quote Originally Posted by smurphy View Post
    Same here. On Gas furnaces I normally just have a T for a vent and clean out.
    The t-vent for my A-Coil drain pan is 3/4". I am not sure why it is so big. Is it is a small residental system. The top of the "T" gushes hot air when the furnace is running. I don't want that kind of warm air in my basment. Can I put a cap on the A-coil drain pan condecnsate line?

    thank

  6. #6
    Join Date
    May 2006
    Posts
    3,508
    Post Likes
    You do realise the first drain looks big time like a home owner speical to me

  7. #7
    Join Date
    Mar 2016
    Location
    Pahrump, NV
    Posts
    2,175
    Post Likes
    Quote Originally Posted by hardtolee View Post
    The t-vent for my A-Coil drain pan is 3/4". I am not sure why it is so big. Is it is a small residental system. The top of the "T" gushes hot air when the furnace is running. I don't want that kind of warm air in my basment. Can I put a cap on the A-coil drain pan condecnsate line?

    thank
    hardtolee, it would be best for you to start a new thread in the AOP Section for this question.

    This thread is more than six years old. Not many people will read it.
    It's an upside down world we live in.

  8. #8
    Join Date
    Nov 2008
    Location
    DFW,TX
    Posts
    4,090
    Post Likes
    Quote Originally Posted by JKopp View Post
    No trap clean-out, no vent. This drain deserves an "F". It can "Air Lock" because there is no vent after the trap. With no overflow safety switch, no clean-out and no vent one is just asking for several thousand dollars of damage due to condensate water backing up and overflowing the cooling coil drain pan flooding out this interior furnace closet. I was giving an estimate to replace this system as it was not operating, but had it been operating and this was a service call I would have not left it running in this condition. I would have made corrections unless the customer refused to and signed off on this statement.

    "Install not up to industry or manufacturer standards, not responsible for any water damage due to installation conditions."

    How many years has this been like this? 20 or so and no one sees this? What an industry. I think plumbers know they need to vent drain lines that is like 101 plumbing.



    Water liability now days is such a huge problem with mold and everything else that can happen there is no short cut to how we do it. Per Lennox factory specs I helped to design and illustrate I know how to do it right. Do this and condensate problems will be just about nil as long as you glue up the fittings and properly route the piping. If anyone is questioning the Rubitex insulation around the trap it is because the water in the trap is very cold and the trap would condensate being it is located in unconditioned space. The clean-out tee is one-inch so the Gallo Gun cone fits easily into the tee. See we have thought of everything.

    John



    this really isnt wall of shame material but we get your point lol we do this more in attics per code because of the temp differentials but closets are rarely much different then home ambient..also a T vent not needed for short runs into a condensate pump or huge line under the return..vents are typically for long runs with a lot of turns etc, helps promote better draining for sure but picking on a 15 yr old install makes me giggle as you are comparing it to brand new one

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