So after getting a new coil last winter I am now getting lots of condensation on the basement floor. The owner came out on Friday (low humidity day and dry basement floor) but you could see water spos on the blower shroud and right below the blower. It then runs right down the middle into the lower section then out around the base. I was told the blower was at 1300 cfm (3 ton Envision), normal is at 1200, owner lowered it 1200 via dip switch. This is all at stage one, have not idea what will happen at Stage 2. To me it seems like the new coil is not allowing the condensation to run down into the drip tray. This is the 4th Summer of usage and the only difference is the new coil. Unit is running normal otherwise. The owner mentioned there is some sort of shield/funnel. I'm concerned it would decrease efficiency or cause the lower blower lifespan. Anyone heard of this issue? CEH in MD

lotsa reasons for condensate collection, hard to help with out more intel

I would ask them to check the cfm at the 1st stage that my be to low.

jlasater, I'm not sure I follow the physics. If the CFM is high would it not pull the water off the coils? If i was low if should allow the water the flow down.

What other info would help?

CEH

Sometimes the blower cfm's drop to low and the coil temp drops with it. Its part of the reason it is able to remove so much humidity. It can saturate a coil with water if its not working right.

Setting the blower speed for each stage can have some complexity.

The obvious consideration is the velocity of the air coming out of the duct registers.

But another important consideration is making sure the speed is fast enough to ensure LAT (Leaving Air Temp) is 50° (F) or higher.  The coil generally freezes up at LAT = 42° (10° above 32°). Staying at an LAT of 50° or warmer ensures not freezing up the coil.

If one has a monitoring system, this is something that can be monitored and/or alarmed on.  For example, in my case, the dashed brown line in this graph,

http://www.welserver.com/perl/plot/...rTemps.png

represents LAT from my 3 ton WaterFurnace Envision unit, running in 1st stage.  I have my CFM set such that the LAT 'hugs' at around the 50° line.

Best regards, Bill

"Saturating" a coil with water by operating it at 0.01*F above the water freezing point has zero, zip, nada to do with the coil's ability to direct water to the condensate drain. Way too high CFM will blow condensate off the coil and onto downstream ductwork, but that result should NOT follow from operating at 425 vs 400 CFM / ton via dipswitch selections.

Something else is going on here, and I doubt it relates to either CFM or coil temperature.

....for instance sweaty supply plenumn could drain back through blower.

The coil is on the return side of the blower, making it very hard to "pull" water from the coil. I have only seen water comming off coils on the supply (Pressurized) side.

Bergy

After some thought..could it not be a drip tray with a crack?
CEH

SOLVED -- Just wanted to let folks know it was the drip pan. The back wall that is next to the coiil had a 4 inch crack. You could only see it when the coil was removed.

CEH

Yay - good on you!