View Full Version : Inside coil verus outside a/c unit debate???
09-27-2011, 07:01 AM
Inside coil is a 3 ton and outside a/c unit is 3.5 ton. My question is what advantages if any will this allow? I have always thought that outside a/c could be smaller and inside coil could be bigger size wise for added efficienty. If I am not mistaken, I read that some pros have installed a smaller coil with larger outside a/c for better humidity control in another thread bit there was a big debate on the topic. I was just wondering what you all think?
The inside coil is TXC036 from 1999 with a 2TTR03042A1000A installed in 2006 . As you might can read from model number both are Trane. So what is the truth about doing such a match up? All AHRI match ups that I find never show a smaller coils with bigger a/c unit but the opposite with a bigger indoor coil for efficenty purposes and in some cases added capacity. Will someone please make some since out of this.
09-27-2011, 08:08 AM
There will always be debate on this one. But how how it been working for you? Your location says a lot. I believe that model coil at that time had a TXV in it.
What does the installing contractor have to say about it? Or find a good one that can do some air diagnostics and take other measurements and calculations and figure out how it is working for you.
09-27-2011, 08:30 AM
Just curious. After so many years, why the ? at this point in time?
How is the system's dehumidification and home's indoor humidity especially for hot humid Louisiana? Any cooling/comfort issues?
09-27-2011, 12:40 PM
A TXC036 is a piston unless it is the high zoot S model high efficiency coil that would have been used with a XL1400 or above. You are far from 13 SEER with the undersized coil and no TXV. The 3042 outdoor unit should have been on a TXV coil. Trane is 1 brand that often listed matches with the evap 1/2 ton smaller but always with appropriate matches and metering devices. The 2TXCB036 is physically larger than the one you have and has a TXV that the entire Trane line wants.
09-27-2011, 01:35 PM
Sounds like "someone" put a larger replacement unit on your 99 coil when the newer AC was installed. As for the efficiency of such a mis-match, it would be hard to tell but probably lower than a "matched" system would have been. I'm assuming you did not own the home in 2006 when the new AC was installed however the previous owner evidently did not want to spend the money needed to replace both inside and outside units and make a truly matched system. I'd definitely recommend keeping the air filter clean and make sure air flow is maximum to keep the indoor coil from "freezing" up. You are probably getting good dehumidification anyway!!:.02:
09-28-2011, 05:07 PM
It was my wife's bosses house that she ask me to go look at. Home is 12 years old, she has had for 2 years with no problems other then bad duct work design and a noise from furnace. I guess the real question that I should have asked was if she has (3) ton inside and a (3.5) ton outside how many btus will this system push as to there is no ahri/trane match that I can find. Does she have a (3) ton or (3.5) ton system?
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