[skipperguy]

Thinking of using Goodman 42016 in a 4-ton split system. 3000 sq ft house, tree shaded, in CT.
Would like to ideally use this unit in a downflow application to preserve the remaining attic room space. (13' X 20' X 8' ceil).
anyone know of downflow disadvangages ????

thanks

skipperguy

 

[Swampfox]

Downflow in an attic?

can really put an overflow pan under that, I think you would eventually have some ceiling damage

 

[beenthere]

What does your contractor say about your idea?


Moved to residential.

 

[fritzhvac]

Is it a finished attic your trying to save space in. Is there a knee wall you could put unit in , So you can have drain pan with primary drain and secondary safety float switch. If you have the room you can possiby frame small knee wall around perimeter, and chase flex runs through there not sure what you got!

 

[skipperguy]

detail

two opposing walls are 32" knee wall potential. one is finished and one is gable. only the one opposite is finished. there is an appr. 24" square space for ducting available along both knee walls and the gable wall.
space and drainage for redundant drain pans is very good.

 

[skipperguy]

REAL detail

sorry, fingers working faster than brain.
4 walls total. one finished with 10' wide by 5' high loft above and beyond.
one is unfinished gable. two (opposed) are unfinished and have appr. 32" knee wall potential. the appr. 24" square space to run ducts is on the three unfinished walls.

 

[fritzhvac]

sorry, fingers working faster than brain.
4 walls total. one finished with 10' wide by 5' high loft above and beyond.
one is unfinished gable. two (opposed) are unfinished and have appr. 32" knee wall potential. the appr. 24" square space to run ducts is on the three unfinished walls.

Yea man, sounds good that should be pleanty of room in those knee walls, but before framing, make sure with H.V.A.C. CONTRACTOR on dimensions of unit,please make sure you use a drain pan, seen terrible water damage wihout drainage safetys. Is floor finished hardwood? If you have not made it that far, we have cut portions of sub floor and ran the runs through joists to other side , make dang sure they are insulated, make sure everything is well insulated!!!! Then you can put hardwood right over top. You may need a little more room for unit but you could frame a little offset around it. Like I said make sure with H.V.A.C. CONTRACTOR first!!!! And by all means give the service tech access panel large enough to (god forbid) pull the unit. Good Luck ! Let me know how it goes.

 

[skipperguy]

Trying again.........
Simply put: 4-ton , 16 seer Goodman, a/c only, upflow supply plenum 11" X 20" (matches a/h flange), return plenum 22" X 24", matches a/h frame. Filter slides into a/h, at top of return plenum and is sized 21.5" X 21.5" Branches and flex lines taken off within 8 Ft. of a/h. Supply plenum is reduced by 85% of each branch as it's taken off. Same for branch sizing as each flex is taken off.
Return ducts/branches and plenum are all increased by 110% as each flex or branch joins.
Is this start viable ???