Alright folks a few of our guys recently installed a 10 ton train vertical, will get model #s tomorrow if need be. They had the issue of condensate dripping off the evap before hitting the drain pan causing water issues downstairs. A week ago the installer went back for the same problem and swapped stages at the command of his boss and said the problem is fixed. Here I am today for the same issue. tomorrow I will check to make sure staging is right but even with 1st and 2nd stage running it still happens. I did add a little 410 to both circuits to get the sc to 10 degrees recommended on the cond name plates. They have two seperate 5 tons for this system. Anywho after correcting the charge the women in the office turned the stat off because it was too cold and they were getting ready to close. So I don't know if that helped the issue. I will have to continue tomorrow. Sorry for rambling but what else should I be looking at here?
Condensate dripping off coil....
thirdcoast361
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M#twe120e300ab let me see if I can post a vid we are gonna clean it Monday but this unit has been running for a little less than a year I dont see how it could just now be factory oil
I have several TTA120B's at one school. Side return, had to put a cookie sheet in them even though the coils were cleaned thoroughly. Didn't drip all the time, but often enough that it became a nuisance.
Our sheet metal shop made up some .067 aluminum cookie sheets and haven't had any repeat problems in 14 years.
Our sheet metal shop made up some .067 aluminum cookie sheets and haven't had any repeat problems in 14 years.
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Cleaning may cure it, but it could also be due to leaks in the coil. Oil from the system contaminates the fins and the water falls off. A quick scan with an electronic leak detector might save you some trouble. If you don't pick up anything then so be it, wash the coil and see what happens.
I am having this exact same issue on a Trane TWE150 vertical that we installed last week. Water drips off the return side of the evap and doesn't reach the drain pan. Coil was rotated 4 degrees. It might be worth looking at the staging of the evap again as explained by gravity but if this was something that affected condensate management, shouldn't Trane have wrote something about it in the install manual? I turned in the drive sheave from 6 turns out to 3 turns out thinking that increased air velocity would keep the water on the coil longer and allow it to run down to the drain. This didn't help. When you figure it out, let us know. I'll do the same.
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Gonna give it a good cleaning tomorrow but I doubt it is residual oil being it has been running for almost a year. If all else fails I'll install the "drip eliminator" untill I can figure it out.
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I have had this same issue with Trane commercial air handlers. As stated clean the coil with a detergent base cleaner like triple D. I have also installed a fan off time delay to run the blower 3-5 minutes after cooling shuts off to help dry the condensate from coil
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122 Posts
I stand corrected. Holy crap its like a night and day difference. A quick spray down with cal-spray no rinse and brush the coil down with a soft bristle brush and not one damn drop off the coil now even when it shuts down. Thank you guys very much for the info. Boss man still wants drip kit installed so I'll post pics of what that looks like when its done should be here around 1030 this morning. Thanks again guys!
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Tranes "drip eliminator" or glorified hail guard whatever...
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Doesn't look like any drip eliminator I've ever seen. I'm not understand how a louvered grille would prevent dripping. Am I missing something here? Something not seen in the picture?
Does changing the direction of the air right before the coil prevent drips?
It will add a bit of pressure drop to the return though.
Does changing the direction of the air right before the coil prevent drips?
It will add a bit of pressure drop to the return though.
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122 Posts
Nope thats what they shipped marked ah drip kit and installed as per instructions. Cleaning the coil worked like a charm though I'm not to worried about that stupid thing
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Yeah I was gonna leave it off but you know those boss types like to be all bossy and ****
yes.... CYA
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Ok we are back to square one. That same twe120 has water dripping off the coil again and the drip elimimator is garbage!! Now to add insult to injury the same place has 2 more twe90's both doing the same thing
Well.... If it's clean and it drips.............try a coat of good ol WD40 to see if it sheets down correctly again. As long as the detergent was on the coil the water could not develop surface tension that would let it bead. I'm not sure but a good old oily coil might not either. I've seen a lot of nasty coils that never drip, just the clean ones.
Just my observations and I'm not in favor of nasty coils.
Just my observations and I'm not in favor of nasty coils.
Have you checked your air flow? Whats the TESP of the unit? Check that against the fan curve and see what you are moving.
If your In a humid area and moving lower then the required air then you will have excess water being built up on the coils.
Any way of checking the FPM on the unit? Id confirm thats not out side the high end of the manufactures limit.
It seems like you have checked everything on the refer side and also cleaned the coil so you know ( Or hope ) their Isn't any oil left on it. Now I think you need to work on the air side of things to confirm your within spec.
If your In a humid area and moving lower then the required air then you will have excess water being built up on the coils.
Any way of checking the FPM on the unit? Id confirm thats not out side the high end of the manufactures limit.
It seems like you have checked everything on the refer side and also cleaned the coil so you know ( Or hope ) their Isn't any oil left on it. Now I think you need to work on the air side of things to confirm your within spec.
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Ok I'm trying to make time to get back over there we've been crazy busy. I'm gonna take the airflow hood and see about getting a monometer. We are having trouble locating the prints for this job and the estimator for this job quite a couple weeks before this problem
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