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consultant 08-07-2010 02:53 PM

Fan blowing water out of drip pan
New home. Out HVAC system that services two zones upstairs is leaking water through the ceiling below. It is a Rheem Classic system and installed on it's side. The ductwork splits at a T right after the A/C coils going left to one zone and right to the other. What is happening is when the A/C is in heavy use (set to 71 -72 degrees and it is about 85-90 out) and a lot of water starts dripping into the pan, the fan blows the water to one side away from the drain so it fills up and the fan begins to blow water into the duct which of course isn't water tight.

Is the problem possibly that the drain needs to be moved from the side of the pan closest to the fan to the other side, or maybe some sort of baffle can be installed?

Our HVAC people though there was a problem with static pressure and another return duct needed to be added. However, he took the cover off the filter housing so the system could pull more air in from the attic and at first we thought that fixed it as we didn't have the problem after running the A/C hard for about 4+ hours. But then last night the water leak was the worst ever (after the A/C had been running for a day and half) and it was even a little cooler last night.

The tech did open it up and pour water into the pan with fan off to make sure the drain and pump were working okay and it pumped water out as fast as he could pour it in.

I'd like to give my HVAC guys some more ideas to investigate. Any suggestions are appreciated.

yuri 08-07-2010 04:08 PM

Too much static pressure in the duct. I have had to put an open tee on the drain line where it leaves the cabinet to relieve the pressure and allow the drain to siphon properly. VERY common problem with horizontal air handlers. The fan may be set too high of a speed and if it is a zoned system when one zone closes it will buildup more back pressure and cause that problem. The open tee loses a bit of air to the attic but sometimes it is the only solution.

NitroNate 08-08-2010 10:56 AM

isn't an open T supposed to be installed on any drain? it allows access and overflow. also, couldn't you just angle the air handler slightly toward the drain side so gravity helps you out?

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