Where are my evaporator coils?


  #1  
Old 08-17-22, 08:56 PM
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Where are my evaporator coils?

Went into the attic and couldn't figure out where they are.
See attached photos and here's a video: Video



Thanks!
 

Last edited by PJmax; 08-18-22 at 10:38 AM. Reason: enhanced/labeled pics
  #2  
Old 08-18-22, 05:24 AM
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Hi, did you pull that front cover off, probably under there
Geo🇺🇸
 
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Old 08-18-22, 08:19 AM
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The two freon pipes should lead to the coil.
 
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Old 08-18-22, 10:40 AM
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Those look like sealed duct units which means there may not be a removable cover to get to the coil. The part of the coil you need to get to is the return side (facing the furnace) as this is the side the dust enters. No visible filters at the furnace which means they are probably behind the return grilles in the hallway. Make sure they're clean. Don't change them with the blower running.
 
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Old 08-18-22, 12:40 PM
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LOL did someone edit my pictures?

If the coils are there then I wouldn't know how to reach them without disassembling the apparatus. I'm better off waiting until summer is over before trying to screw with them.

There are a few return grilles on the first and second floors but it just shows a conduit that leads up to I'm guessing the units. Nothing there to clean as the conduits look really clean themselves.

Beyond that plate is the unit circuit board. I recently changed one of the transformers on it but didn't notice there being any serviceable parts behind it.

Any other thoughts?
 
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Old 08-18-22, 09:22 PM
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There are a few return grilles on the first and second floors but it just shows a conduit that leads up to I'm guessing the units. Nothing there to clean as the conduits look really clean themselves.
Not quite following you. Do you mean there are no filters at the grill locations ?
I don't see them at the furnace so if there are no filters at the intake grilles.... your coils will need to be cleaned.
 
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Old 08-19-22, 08:48 AM
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PJMax,

There are filters there. I changed them at least twice since March.
 
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Old 08-19-22, 01:46 PM
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Ok.... that's a good thing.
 
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Old 08-19-22, 08:18 PM
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So, should I disassembly the attic units? I've never done that before. Someone told me to remove the two air ducts but not sure what I'm up against.
 
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Old 08-19-22, 10:50 PM
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Why do you need to get to the coils ?
Is there a problem or do you just want to clean them ?

I can't tell you how to proceed. Removing the ducts will give you access to the wrong side of the coil. You need access to the side that faces the furnace. From what I see it looks like you'd need to disconnect the supply plenum from the furnace, That would mean messing with the refrigerant lines. That's not a job I'd want to do and would not consider it a DIY job.

When the coil was attached to my furnace it was in a similar plenum. I never had it apart in over 30 years. When I recently replaced the A/C system the coil was clean. I kept the filters clean,
 
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Old 08-20-22, 09:02 AM
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I'm just assuming that they do need cleaning. The last homeowners didn't seem to take good care of the house. When I moved in, the AC filters were filthy as hell.

But if it's too much of a task then I'll sit tight for the time being.
 
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Old 08-20-22, 01:55 PM
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The service side is usually the top on those Allstyle Plenum coils.
If the top is metal then I would epect to see screws on the perimeter of the top.
If the top is ductboard then a knife will get you into the top.

This picture shows the modern models with a V shaped coil but the older models have a U shaped coil.
Watch out for the drain connection. The pan is made of easily broken plastic on some older models.



 
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