trane XL13i 2 ton question...

[selim]

I bought a 2 ton trane, the 13 seer unit condenser, but for this model it calls for fixed orifice, I put in the TXV a-coil from the newer XL14i. theoretically speaking would this now be a 14 seer? If the rating plate specs are the same, might I assume that the extra seer would have come solely from the txv? thanks

[BaldLoonie]

What's the indoor unit model #?

[selim]

model 4cxaa024ac3cuaa

[BaldLoonie]

Won't find ARI data on that match.

GENERALLY, anything Trane to get even 12 SEER has to have a TXV coil. GENERALLY to get OVER 12 SEER requires a variable speed indoor unit. Even then getting SEER out of a Trane is hard. There are some cases where the XR13/Allegiance 13 gets higher SEER with standard blower than the XL14i/Allegiance 14. And it seems the R22 models do better than the R410a models

My GUESS is you are running 12ish SEER with your system without variable speed blower. With it, probably 12.75-13.00 but no way to know for sure.

[selim]

i guess my variable speed blower and programmble stat will help things....
what's your opinion on oversizing the condensor? I heard that if you oversize the condenser by a half ton, you'll get a bit more efficiency out of it. thanks

[comfortdoc]

That's a new one. There are some matchups that go the other way with the coil a full nominal ton oversize. This is just playing with nomenclature. The indoor coil was sized and named originally when rated with a 10 SEER condenser. Now that same indoor coil does not have a large enough surface area for the same sized 13+ SEER condenser so a "larger" coil must be used.

Over the next 12-18 months I expect the manufacturers to change the nomenclature so the numbers are more easily recognized as a match. But that is just my personal opinion.