AC on a downflow help

GW

Hi,

I'm tyring to get an AC coil on a downflow furnace- is there any issues concerning excess moisture, or anything of the sort, if the A coil was mounted on the top/return? Thanks for any help,

gary

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D lux_2

A coil has to go

under the heat excanger you dont want to blow cold air a cross the excanger . It will condense humidity in the h/c and rust it out .

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harvey

Most commercial rooftop units use a draw thru coil. If you have a standing pilot furnace condensation might be an issue.Don't forget to put the filter on the intake side of the coil and put a trap in the drain piping. All in all it will work fine.

clammy

down flow w/ coil

done a few of these in the past they always seem to be a pblem here and there with them here's a few things to keep in mind
make sure you raise your coil off of the ground so you can get atrap on your pan and have you considered using a up flow furnace and just re do some sheetmetal done it alot save alot of hassle and make servicing the coil and cleaning it easier remenber if you do the down flow to re enforce that case coil or the metal will get crushed.a few times we have just reversed the flow and design of the system because most down flow supplies where just duct title in the slab and most where filled with mold and moisture plus usally sized just for heat and when you put a/c on them they don't work as well as you might except.there alot of o[itions with a down flow so takea good look before you leap into it lost one couple months back because we noticed it while other contractors didn't home owner didn't even know there unit was a down flow and niether did the other guys who gave her quotes i guess they found out the hard way good luck

John Mills_3

That's right

most packaged units have coils in the return. Their heat exchangers rust out in no time. Typical life seems to be under 10 years on many of them.