Proper Coil Placement - Before or After Furnace?


T

Taylor

I have a crawlspace with a horizontal furnace -> coil placement. The coil needs to be replaced, but the tech cannot find any on the market the same size (the coil is an A-type, 20 yrs old).

Current Config: Horizontal
Return -> Filter -> Furnace -> 90 degree Bend -> A Coil
(Link to Image of Config: http://prntscr.com/1arrck)

I had one tech come in and say that he can alter the configuration to be horizontal "pull-through".

Return -> Filter -> Flat Coil -> Furnace -> 90 degree bend
(Link to Image of New Config: http://prntscr.com/1arrnx )

So, my question is: Will this new config cause problems? I've read a couple conflicting statements like:

"The evaporator coil must be installed in the discharge
(supply) air of a gas or oil furnace. Do not install an
evaporator coil in the return air, or excessive condensation
will occur within the furnace."

Then the second image was taken from a site that recommends the new setup for better "thermodynamics" of pulling moisture from the air via a "pull-through" method.

Any help would be appreciated. I've gotten two quotes for fixing my unit:

1. Pull-through - $900
2. Full replacement of furnace + coil (bc they can't fit a coil after furnace) - $3,700

Thanks!
 
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T

The Daring Dufas

I have a crawlspace with a horizontal furnace -> coil placement. The coil needs to be replaced, but the tech cannot find any on the market the same size (the coil is an A-type, 20 yrs old).

Current Config: Horizontal
Return -> Filter -> Furnace -> 90 degree Bend -> A Coil
(Link to Image of Config: http://prntscr.com/1arrck)

I had one tech come in and say that he can alter the configuration to be horizontal "pull-through".

Return -> Filter -> Flat Coil -> Furnace -> 90 degree bend
(Link to Image of New Config: http://prntscr.com/1arrnx )

So, my question is: Will this new config cause problems? I've read a couple conflicting statements like:

"The evaporator coil must be installed in the discharge
(supply) air of a gas or oil furnace. Do not install an
evaporator coil in the return air, or excessive condensation
will occur within the furnace."

Then the second image was taken from a site that recommends the new setup for better "thermodynamics" of pulling moisture from the air via a "pull-through" method.

Any help would be appreciated. I've gotten two quotes for fixing my unit:

1. Pull-through - $900
2. Full replacement of furnace + coil (bc they can't fit a coil after furnace) - $3,700

Thanks!
The pull through would be fine if your furnace had a stainless heat
chamber like a condensing furnaces but I wouldn't do it on an older
steel heat chamber furnace. Price looks kind of high to me. You might
try to find someone who can build an adapter. ^_^

TDD
 
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J

jamesgangnc

I have a crawlspace with a horizontal furnace -> coil placement. The coil needs to be replaced, but the tech cannot find any on the market the same size (the coil is an A-type, 20 yrs old).



Current Config: Horizontal

Return -> Filter -> Furnace -> 90 degree Bend -> A Coil

(Link to Image of Config: http://prntscr.com/1arrck)



I had one tech come in and say that he can alter the configuration to be horizontal "pull-through".



Return -> Filter -> Flat Coil -> Furnace -> 90 degree bend

(Link to Image of New Config: http://prntscr.com/1arrnx )



So, my question is: Will this new config cause problems? I've read a couple conflicting statements like:



"The evaporator coil must be installed in the discharge

(supply) air of a gas or oil furnace. Do not install an

evaporator coil in the return air, or excessive condensation

will occur within the furnace."



Then the second image was taken from a site that recommends the new setup for better "thermodynamics" of pulling moisture from the air via a "pull-through" method.



Any help would be appreciated. I've gotten two quotes for fixing my unit:



1. Pull-through - $900

2. Full replacement of furnace + coil (bc they can't fit a coil after furnace) - $3,700



Thanks!
I would not put it ahead of the furnace. A cased horizontal flow A coil is not hard to come by. Worst case you could mix brands. Is the outside unit 20 years old as well?
 

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