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Carrier air handler tonnage?

I apparently have a mismatched split system. The outside condenser unit was replaced with a 1 1/2 ton condenser. The original system is a Carrier, the inside air handler model number is FF1CNA030, which I take to be a 2 1/2 ton system, which needs a 2 1/2 ton condenser unit
Please help Mark

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That is a fairly large difference. It is usually ok to have the inside evap. coil and blower up to 1 ton larger than the outside condenser. That will make the unit slightly more efficient as well as less likely to freeze up on low airflow situations. It is not recommended to install a new condenser on an old evap coil. There has been a lot of changes to the design of the coils in the last little while. For example a 10 year old 2 ton coil may only have 3 cubic feet of volume but a new 2 ton coil may have 4 cubit feet of volume.

There are many factors that may have infulenced the decision on what size condenser to install. Many of which can only be done by visiting the home and doing alot of work, checking the duct sizing bioth supply and return, inspecting the insulation and windows of the home etc. etc. Most of the time that never gets done. You can blame the contractor for not doing a complete check, but at the same time you can blame the customer because many contractors that are that good loose the job to a cheaper bid that did not no any of the research. It is a catch 22 for everyone involved.

There is ALOT more to sizing equipment that many people think, sadly that also includes many HVAC contractors. Way too many people use "rule of thumbs" or flat out "guess".

Sorry for the rant but your queston can only be answered by a good well educated HVAC contractor visiting your home. That type of a contractor is getting hard to find these days in such a price competetive world.

Posted on Oct 14, 2008

  • utah300rum Oct 14, 2008

    If you would like to give me the state and town you live in I may be able to contact a Carrier representative, that may be able to recommend a good HVAC dealer.



    Good Luck

  • gtimm6915
    gtimm6915 May 26, 2012

    Are you still out there with info on Carrier HVAC dealers?? I live in 62206 zip code area.....know anyone that could help me find an air conditioner and have it installed? Sadly to say, but mine was stolen when the (prior) owners of the house went to FL for the winter ...so it was purchased by me with no air....NOW I need air in the house!!! Can you help? It is an older Crusader Carrier.

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Your outside condenser unit must be a 030 model. or 30000 btu

Posted on Jan 15, 2009

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