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Old 05-04-2020, 03:21 PM   #1
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Slab Evaporator in an upflow furnace


All,
Can I use a slab Evaporator in an upflow furnace? (laying it flat, not "vertical" like photos I see online of horizontal attic furnace installations) I have a very tall furnace with only about 13-14" between the top of the furnace and where the two trunks T off. (furnace in center of basement - Ranch home) Most(all) of the A-coils I have found are too tall. And if not too tall (height wise), they're too large (dimensional) without a complete re-work of the main trunk and secondary trunks. I have found a few slab coils that are about 10-12" "thick" and I can make work without trashing the entire trunk. (assuming a flat/horizontal configuration is acceptable)
Thank you
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Old 05-04-2020, 03:31 PM   #2
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Re: Slab Evaporator in an upflow furnace


No you can't use a slab coil flat because the condensate would leak into the furnace.
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Old 05-04-2020, 03:35 PM   #3
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Re: Slab Evaporator in an upflow furnace


ok thank you. Is that the function of the "A" in A-coil? the coils are angled in such a way that the condensate drips down to the sides and is funneled away in the bottom tray?

Any suggestions for this particular issue or am I stuck gutting/reworking my whole main trunk to fit a standard A-coil?
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Old 05-04-2020, 04:07 PM   #4
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Re: Slab Evaporator in an upflow furnace


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Originally Posted by swamper8 View Post
Any suggestions for this particular issue or am I stuck gutting/reworking my whole main trunk to fit a standard A-coil?

Good opportunity to upgrade your furnace. Most new upflow 92% + furnaces are about 33" high leaving plenty of room for a standard "A" coil. Probably a lot easier too.
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Old 05-04-2020, 04:18 PM   #5
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Re: Slab Evaporator in an upflow furnace


It is a prime opportunity but I just hate getting rid of this furnace. It's been very dependable and honestly my heating bill is never more than $150 a month even in the dead of winter. I suppose if I were getting 300-600 heating bills, upgrading to something more efficient would be a motivator.
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Old 05-04-2020, 05:15 PM   #6
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Re: Slab Evaporator in an upflow furnace


Rheem Multiflex Coil 2.5 and 3 Ton are 13.8" tall. Don't know what capacity you need.



https://www.gemaire.com/rheem-rcba-3...specifications
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Old 05-04-2020, 05:22 PM   #7
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Re: Slab Evaporator in an upflow furnace


Looks like the Rheem 3.5 and 4 ton coils are 13.8" too. Might be tough to fit on top of your furnace without some sort of transition though.


https://www.gemaire.com/rheem-rcba-4...specifications
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Old 05-04-2020, 06:04 PM   #8
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Re: Slab Evaporator in an upflow furnace


Quote:
Originally Posted by 57TinkerMan View Post
Rheem Multiflex Coil 2.5 and 3 Ton are 13.8" tall. Don't know what capacity you need.



https://www.gemaire.com/rheem-rcba-3...specifications
Having the top of the coil too close to the top of the plenum may cause airflow issues.
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Old 05-05-2020, 08:50 AM   #9
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Re: Slab Evaporator in an upflow furnace


Thanks for the suggestions. I need to be in the 1.5-2 ton range. Presumably smaller so you'd think it'd be no problem to find a more compact evaporator. I will check out those companies other offerings though.
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Old 05-05-2020, 01:22 PM   #10
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Re: Slab Evaporator in an upflow furnace


All the coils have gotten bigger to meet minimum efficiency requirements.
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