Replyit needs a transition to be correct. a lazy installer would tell you otherwise. i'd think about replacing the furnace too unless it's really new.
New Guest
Hi all,
I'll be purchasing a new A/C split system. The furnace is horizontal in the attic and is 14.5" wide. The new evap coil case is 17.5" wide. My guess is that you'd want a transition adapter from the furnace to the coil. But space may be an issue.
What if the installer wants to attach the coil case directly to the furnace and just cap the overhang. Is that an acceptable way of doing things? The A-coil opening is around 9".
Thanks for any opinions.
Professional Member
it needs a transition to be correct. a lazy installer would tell you otherwise. i'd think about replacing the furnace too unless it's really new.
New Guest
Thanks for the input! That's what I figured. The furnace is a 12 year old
XE80 in good shape (mild winters). I'd love to go with a new variable speed unit but it's hard to justify the cost as we'll be moving in 2-5 yrs.
Global Moderator
Those are a good furnace. I'm with Horsey, a good installer can make a nice transition to the wider coil. More work but the right way.
Professional Member*
Our guys carry what they call 'blanks' on their trucks.
Plain sheetmetal strips..and insulated sheetmetal strips.
If they use an uninsulated blank they insulate it externally.
All seams & joints are mastic sealed.
I've seen the oversized openings closed off with duct tape and
foil tape. Neither last long.
Best of luck to you.
The cure of the part should not be attempted without the cure of the whole. ~Plato
Professional Member*
hack-olicous.Originally Posted by energy_rater_La
FILL OUT YOUR PROFILE!!
Regular Guest
hack-olicous.
Yeah,its called metal board. we just stick the corners together and stick some tin tape to connect it. But its kind of embarassing telling the builder he cant pressure test
Professional Member*
Yeah,its called metal board. we just stick the corners together and stick some tin tape to connect it. But its kind of embarassing telling the builder he cant pressure test
sweet......my job is safe.
FILL OUT YOUR PROFILE!!
Professional Member
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Professional Member*
get the right coil size . i don't think the openings have changed size.
Professional Member*
The coil should have recommended installation instructions and how to handle this situation. Given that you have stated there is limited space. A small transition probably will not make any difference. It's like an upflow furnace and coil that do not match. You do not build a transition for that, but there are instructions that deal with the manufacturer's recommended way to handle this. The coil might be shifted to the left or right. The same with the horizontal. It might hang a little low or sit a little high. Just do as the instructions say and all should be well.
Professional Member*
It seems to be standard procedure for the crew...
2 of the crew make the transitions in the sheet metal shop.
I think the 'blanks' are for unforseen issues.
I do know that they screw them in place & mastic seal.
Would this be consitered hacking??
I test the ductwork when the work is done.
Total duct leakage (return leakage also) is within Energy Star allocation.
The cure of the part should not be attempted without the cure of the whole. ~Plato
Professional Member*
yes ....it would.
FILL OUT YOUR PROFILE!!
Regular Guest
if u cant make a quick 6" transition for that on site with some flat stock and a bar folder, come on now..
Professional Member*
Just read the instructions in the box that the coil comes in. Most are fairly descriptive on how mount their coils. It's not like you need a book if you've done it before.
Professional Member
Everyone already knows a transition is the right thing to do, why argue over how to cut the corner?
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