Bill Kibbel Posted March 15, 2012 Report Share Posted March 15, 2012 I'm suspecting a mismatch (smaller evaporator coil) based on the model numbers of this Carrier system.. Outdoor: Click to Enlarge 18.74 KB Indoor: Click to Enlarge 21.82 KB I'd appreciate any comments from our HVAC experts (Terrence!). Quote Link to comment Share on other sites More sharing options...
John Dirks Jr Posted March 15, 2012 Report Share Posted March 15, 2012 I think the numbers indicate a 2 ton compressor unit and a 3 1/2 ton evap core. The 42 at the end in the evap # indicates 3 1/2 ton. That would make the evap significantly larger than the comp, not smaller. Of course I could be wrong. Furthermore, I don't know the effect of an over sized evap so I'm interested in hearing for experts as well. Quote Link to comment Share on other sites More sharing options...
John Dirks Jr Posted March 15, 2012 Report Share Posted March 15, 2012 Wait....the 48 in the comp # makes it a 4 ton. So, I stand corrected by myself. Quote Link to comment Share on other sites More sharing options...
HVACMASTER Posted March 15, 2012 Report Share Posted March 15, 2012 You got a 4 ton out and 3.5 in Mismatch Quote Link to comment Share on other sites More sharing options...
John Dirks Jr Posted March 15, 2012 Report Share Posted March 15, 2012 You got a 4 ton out and 3.5 in Mismatch Is that an absolute rule? I had heard of a rating standard that might allow such an arrangement in certain circumstances. Something about an AHRI listing. Quote Link to comment Share on other sites More sharing options...
HVACMASTER Posted March 15, 2012 Report Share Posted March 15, 2012 You got a 4 ton out and 3.5 in Mismatch Is that an absolute rule? I had heard of a rating standard that might allow such an arrangement in certain circumstances. Something about an AHRI listing. Mismatch meaning not the same size (smaller evap) as op stated. AhRi does 3rd party testing and certification of certain matchups and some "mismatch are certified". And yes it is acceptable not ideal in some circumstances but almost always an adjustment to the refrigerant charge would be required. Quote Link to comment Share on other sites More sharing options...
RSpermo Posted March 15, 2012 Report Share Posted March 15, 2012 I would ask Carrier if the coil and the condenser are allowed to be used (matched) together. The final answer rests with the manufacturer. Quote Link to comment Share on other sites More sharing options...
Marc Posted March 15, 2012 Report Share Posted March 15, 2012 RSpermo got it right. The tonnage isn't in the model number on Carrier residential units. It's the only brand in which you've got to call the manufacturer to get that info. Marc Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted March 15, 2012 Author Report Share Posted March 15, 2012 Thanks for the replies. My favorite HVAC expert emailed me this afternoon confirming it to be a 4 ton condensing unit and a 3.5 ton evaporator coil. Quote Link to comment Share on other sites More sharing options...
HVACMASTER Posted March 15, 2012 Report Share Posted March 15, 2012 Thanks for the replies. My favorite HVAC expert emailed me this afternoon confirming it to be a 4 ton condensing unit and a 3.5 ton evaporator coil. The tonnage isn't listed but the BtU code is on all carriers, 48 in model =48000 btu 12000 btu =1 ton 48000btu= 4 ton Same goes for all carrier coils and ahu It may be a certified matchup but it is never ideal to mismatch in my opinion Quote Link to comment Share on other sites More sharing options...
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