randynavarro Posted February 21, 2007 Report Share Posted February 21, 2007 Ok, for the guys that see these everyday. I see five air conditioners a year and usually all five have the front of the evaporator cabinet totally sealed and inaccessible. Finally got an accessible one today. Is this 'normal' corrosion on the bottom tray of these coils? Quote Link to comment Share on other sites More sharing options...
randynavarro Posted February 21, 2007 Author Report Share Posted February 21, 2007 Download Attachment: EvapCoil.jpg.JPG 34.45 KB Download Attachment: EvapCoil2.jpg.JPG 30.41 KB Quote Link to comment Share on other sites More sharing options...
Brian G Posted February 21, 2007 Report Share Posted February 21, 2007 Buster, I really can't tell a lot from the photos, but here in AC land a small amount of rust or corrosion is very normal at the evaporator (end brackets, etc.). I once saw a system that was less than a month old with more than that. I don't understand why they don't use aluminum or some alloy for those parts, unless it's planned obsolecense or cheapo-ism. Somewhere between 1/2 and 2/3rd's of those I see are also sealed up and inaccessible. I wish they couldn't do that. Brian G. Love That AC [:-love] Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted February 21, 2007 Report Share Posted February 21, 2007 Originally posted by randynavarro Ok, for the guys that see these everyday. I see five air conditioners a year and usually all five have the front of the evaporator cabinet totally sealed and inaccessible. Finally got an accessible one today. Is this 'normal' corrosion on the bottom tray of these coils? The corrosion on the coil doesn't look unusual. But it shouldn't be spilling onto the lower plenum like that. - Jim Katen, Oregon Quote Link to comment Share on other sites More sharing options...
Terence McCann Posted February 21, 2007 Report Share Posted February 21, 2007 Randy, explain the view on the first picture for me. Are you looking at a horizontal furnace? Is it a counter-flow (down-flow furnace) designed for a slab home? I'm trying to figure out if the evap coil is installed upside down. Typically they need to be installed upright as shown in picture. Quote Link to comment Share on other sites More sharing options...
randynavarro Posted February 21, 2007 Author Report Share Posted February 21, 2007 Originally posted by Terence McCann Randy, explain the view on the first picture for me. Are you looking at a horizontal furnace? Is it a counter-flow (down-flow furnace) designed for a slab home? I'm trying to figure out if the evap coil is installed upside down. Typically they need to be installed upright as shown in picture. Yes, it is a downflow. Here, most are as the supply ducts run through the crawlspace under the home. Very few slabs here. Quote Link to comment Share on other sites More sharing options...
randynavarro Posted February 21, 2007 Author Report Share Posted February 21, 2007 Originally posted by Jim KatenThe corrosion on the coil doesn't look unusual. But it shouldn't be spilling onto the lower plenum like that. - Jim Katen, Oregon Thanks Jim. Sounds reasonable. Quote Link to comment Share on other sites More sharing options...
randynavarro Posted February 21, 2007 Author Report Share Posted February 21, 2007 Originally posted by Brian G. Buster, I really can't tell a lot from the photos, but here in AC land a small amount of rust or corrosion is very normal at the evaporator (end brackets, etc.). I once saw a system that was less than a month old with more than that. I don't understand why they don't use aluminum or some alloy for those parts, unless it's planned obsolecense or cheapo-ism. Somewhere between 1/2 and 2/3rd's of those I see are also sealed up and inaccessible. I wish they couldn't do that. Brian G. Love That AC [:-love] Thank you kindly Brian. Thats helpful. But . . . who's Buster? Quote Link to comment Share on other sites More sharing options...
Terence McCann Posted February 21, 2007 Report Share Posted February 21, 2007 Who's the manufacture Randy? I'd check with them about coil installation. Wouldn't be this first time I saw it bassackwards. Biggest problem when they do this is condensation carry over. Quote Link to comment Share on other sites More sharing options...
randynavarro Posted February 21, 2007 Author Report Share Posted February 21, 2007 Terry, I'm confused. Are you saying the coil is upside down even though it is a down draft unit? What is "condensation carry over". Quote Link to comment Share on other sites More sharing options...
Terence McCann Posted February 21, 2007 Report Share Posted February 21, 2007 Yes, it could be installed upside down. The only way to be 100% sure that it is correct/incorrect is to get model & serial numbers and check with the manufacture. A coils are typically installed in the A fashion, not a V fashion. Did the condensate pan look like it was a factory thing or something that might have been banged out in the field? Condensation carryover is when the condensate does not drain to the condensate pan correctly and ends up getting in the duct work. This can happen for a few reasons, installing the coil incorrectly is one of them. It can also happen with a high delta P across the coil. In the commercial equipment, where you can change pulleys on the fan and motor, you can actually speed up the fan to a point where it will blow the condensate off the coil (or pull it off if the coil is on the negative side of the fan). This happens more with vertical coils on builtup or package systems. Example might be where an HVAC company speeds up the fan to try to get more air flow and ends up creating this problem. Quote Link to comment Share on other sites More sharing options...
Brian G Posted February 22, 2007 Report Share Posted February 22, 2007 Originally posted by randynavarro But . . . who's Buster? Pay no attention Randy...it's the drugs. [:-boggled Brian G. It's Just The Man, Keepin' Me Down [^] Quote Link to comment Share on other sites More sharing options...
Terence McCann Posted February 22, 2007 Report Share Posted February 22, 2007 Randy, One other thought on this, it might be a N coil. If so that should be OK. Did you see another tube sheet that wasn't visible in the picture? Something like this? Quote Link to comment Share on other sites More sharing options...
randynavarro Posted February 22, 2007 Author Report Share Posted February 22, 2007 Terry, You're the best. Sorry I didn't follow up when I got the info 2 days ago. Yes, in fact it is an "N" coil. Called Carrier and they helped me with the specs. Where are you getting your little pics to post? Quote Link to comment Share on other sites More sharing options...
Terence McCann Posted February 22, 2007 Report Share Posted February 22, 2007 Originally posted by randynavarro Where are you getting your little pics to post? Google my good man, Google. Quote Link to comment Share on other sites More sharing options...
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