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Trane air handlers leaking water

We are having an issue with the Trane TWE (the odyssey model) air handler. 7.5 and 10 ton models. The issue is the water is falling directly down off of the evaporator coil, rather then following
the coil down and into the drain pan. I know this Normally means that the coil needs to be cleaned, but the units are less then 6 months old, and the coils are spotless they were installed over the winter and now that it is summer, they are leaking water. We installed six of these, and three are leaking. The drain lines are clear, and the traps are primed and deep enough. You can see water flowing through the condensate line. The unit is draining, it’s just that the water is falling off the coil. Any assistance would be much appreciated. Thanks to all.

Comments

  • ChrisJChrisJ Member Posts: 11,075
    edited July 21
    When they say clean the coil it means of oil left behind from manufacturing. Not really dirt from use.

    I would try cleaning them really well.
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
    ratiozepfan
  • pecmsgpecmsg Member Posts: 1,450
    zepfan said:

    The drain lines are clear, and the traps are primed and deep enough.\

    Checked by Eye or static pressure?

  • clammyclammy Member Posts: 2,505
    Are these air handlers horizontal or vertical ? I know on some carrier units in vertical applications the pan can be pitched by removing two screws allowing the pan to be slightly pitched. If horizontal are the unit level or slightly pitched towards the drain. How is the air flow ? As other have stated in the past it may be a small layer of manufacturing oils on the coil not lettting the condensate adhere to the coil and drop off . Are these single or two stage units if 2 stage where the coils piped correctly 1 stage lower coil 2 Nd stage top I ve seen in the past where they where set up oppisite and had this issues more so w vertical units then horizontal set units but have seen it happen . Peace and good luck clammy
    R.A. Calmbacher L.L.C. HVAC
    NJ Master HVAC Lic.
    Mahwah, NJ
    Specializing in steam and hydronic heating
  • zepfanzepfan Member Posts: 298
    Thanks for all the responses. The air handlers are all horizontal. Yes we have checked the traps both by eye and static pressure. They each go into their own condensate pump which you can see the water level in the pump rising fast while the unit is running, and also see water leaving the drain pan. It’s just that some of the condensate falls directly down off the coil. I have a video of the condition, but for some reason I can not upload to this post. Thanks to all
  • Jamie HallJamie Hall Member Posts: 12,956
    ChrisJ said:

    When they say clean the coil it means of oil left behind from manufacturing. Not really dirt from use.



    I would try cleaning them really well.

    Brake clean?
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
    zepfan
  • ChrisJChrisJ Member Posts: 11,075

    ChrisJ said:

    When they say clean the coil it means of oil left behind from manufacturing. Not really dirt from use.



    I would try cleaning them really well.

    Brake clean?
    I'd use foaming evaporator cleaner made for aluminum evaporators assuming that's what it is.

    I suspect brake clean wouldn't smell very good indoors.
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
    zepfan
  • unclejohnunclejohn Member Posts: 1,572
    Low air flow or low charge. Not enough air to keep the water on the coil. Not enough charge leaves the bottom of the coil dry and the water just drops off.
    zepfan
  • JUGHNEJUGHNE Member Posts: 6,985
    For me, a problem like this was solved by spraying a soapy mixture of Dawn dishwasher soap and water on the both sides of the coil.
    This gives you "wetter water" and it tends to cling to surfaces.
    May also remove any oils.

    Might work, cheap to try.
    No smelly chemicals or rinsing.
    zepfan
  • EBEBRATT-EdEBEBRATT-Ed Member Posts: 7,099
    Are the AHUs 2 stage cooling or single stage?

    The first stage has to be pipe to the lower coil unless they are intertwined coils
    zepfan
  • zepfanzepfan Member Posts: 298
    Thanks to all that responded. The 10 ton units are two stage with intertwined copper coils, first stage piped to the bottom. The 7.5 are single stage, one circuit
  • ratioratio Member Posts: 2,496
    I use one of these, aerosol for a small job, pump sprayer for a larger job.
  • ChrisJChrisJ Member Posts: 11,075
    ratio said:

    I use one of these, aerosol for a small job, pump sprayer for a larger job.

    This is the one I used.
    Seemed ok.....

    https://www.nucalgon.com/products/coil-cleaners-sprayers/evaporator-cleaners/evap-foam-no-rinse/

    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • ratioratio Member Posts: 2,496
    That one's closer to the door at Johnstone, so I end up with that one pretty often, too. :smiley:
  • hvacfreak2hvacfreak2 Member Posts: 481
    I had a problem last year with these ahu's doing this as well. They do make a drain pan " accessory " for this but we found that they would drain correctly if we increased the fan speed. Heck of a way to to balance a system ... increase airflow until water stops falling out of the unit.
    hvacfreak

    Mechanical Enthusiast

    Burnham MST 396 , 60 oz gauge , Tigerloop , Firomatic Check Valve , Mcdonnell Miller 67 lwco , Danfoss RA2k TRV's

    Easyio FG20 Controller

  • ratioratio Member Posts: 2,496

    I had a problem last year with these ahu's doing this as well. They do make a drain pan " accessory " for this but we found that they would drain correctly if we increased the fan speed. Heck of a way to to balance a system ... increase airflow until water stops falling out of the unit.

    Thanks, I'll keep this in mind, as we install Tranes from time to time.

    @zepfan, was an air balance done? Is the unit at design airflow, or under?

  • zepfanzepfan Member Posts: 298
    Thanks again for all the responses. No a certified balance was not done, this is a replacement job, but we own a balance cone and I think I need to go back to the job with it.
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