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Old 12-01-2012, 05:12 AM   #16
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20yr old Keeprite question


As others have said, A/C coil needs checked. Its one of the things that often gets over looked as a cause of poor air flow during the heating season.

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Old 12-01-2012, 10:20 AM   #17
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20yr old Keeprite question


Ok I would like to try and clean the 'A' coil but there is no access so where do I make the opening at the front of the plenum?

Thanks guys
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Old 12-01-2012, 11:37 AM   #18
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20yr old Keeprite question


Take a few pictures of the inside unit and post them.
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Old 12-01-2012, 12:35 PM   #19
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20yr old Keeprite question


At best, if your lucky and careful, you'll be able to pull the Plenum apart, maybe by expanding a Pittsburgh joint. Slide the acoil off the furnace, should the lineset permit, on to some saw horses. This would give 100% access to clean the crap out of it.
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Old 12-13-2012, 08:35 AM   #20
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20yr old Keeprite question


I was finally able to take a few pictures of the unit and here they are. I took some tape off from around the a coil lines and drain and it seems there's more to just cutting a hole. There seems to be a plenum inside a plenum???
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Old 12-13-2012, 10:22 AM   #21
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20yr old Keeprite question


Having seen those pics I can safely tell you that furnace has obsolete burners,the exhaust fan is next to obsolete and VERY expensive if you can find one. If you can find those parts they now cost 2-3X what they used to retail for due to the rarity. Your choice whether to delay the ineveitable. Your AC coil is down against the top of the furnace and there is no access to the underside of it for cleaning. Even with a good filter properly maintained after 20 yrs dirt will still get into it and plug it up. If the AC is that age too it is on its last legs or can be. The AC coil can be cleaned when the furnace is removed for replacement. The freon level should be checked in the Spring. If it is low and the coil freezes and then leaks water into your brand new furnace then $1000 or more damage can occur.
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Last edited by yuri; 12-13-2012 at 02:21 PM.
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Old 12-13-2012, 11:04 AM   #22
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20yr old Keeprite question


First of all, I for one am constantly amazed at the level of knowledge that Yuri Posseses, Doc Too. Thanks to both of you.

Second of all, ATTEMPTED is not the same as cleaned, And if the evaporator coil has not been cleaned I completely agree with the poster that said the coil might be clogged with gunk.

If she pulled out the blower and the wheel and soaked and cleaned the vanes with a wire brush OK, then she cleaned it.

If that was all done then it is time for an upgrade to something more efficient.

My 2 cents. Not that it equals Yuri or docs 10 bucks.
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Old 12-13-2012, 11:07 AM   #23
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20yr old Keeprite question


Thats a lot newer than my Dads, which we replaced about 20 years ago. His looked like a 40 Ford Sedan. Trim and All
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Old 02-07-2014, 11:21 AM   #24
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20yr old Keeprite question


Does anyone know if this furnace has a flame sensor and if so where would it be?
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Old 02-07-2014, 11:31 AM   #25
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20yr old Keeprite question


The pilot burner does both spark and flame sensor off the one electrode.
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Old 02-07-2014, 01:27 PM   #26
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20yr old Keeprite question


Yuri thanks so much!

Is it good practice on these furnaces especially to routinely clean this electrode?
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Old 02-07-2014, 05:09 PM   #27
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20yr old Keeprite question


No. Unless you are a Pro and understand the grounding aspect and problems that can happen you should leave it alone.

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