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Compressor went out on 4 ton unit. want to upgrade to 5 ton A/C. Have been told need bigger blower unit. Can I exchange to blower unit that will handle 5 ton A/C?

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Hi mans1930. You need to replace the whole inside blower unit, the coil as well as the blower. If not, there would be a very good chance of damaging your outdoor unit, namely by ruining your new compressor.

Greg.

Posted on Aug 18, 2008

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What is the HP rating if a 3 ton air conditioner?


Hi, this depends on the compressor that is installed in this unit. It may be a Copeland scroll, a Tecumseh, its hard to say. Most compressors are around 2 hp for a 3 ton unit. On the data plate it will tell you the h.p. of the blower and condenser fan motors such as 1/4 h.p., or 1/3. If you can get the name and model numbers from the top of your compressor, you can call a a/c, Refrigeration parts house, wholesale and they will have it in there manuals. The B.T.U. rating for your compressor is 36,000. There are 12,000 BTU's per ton of cooling, this is something that almost no one knows, but now you do. If it were a smaller unit such as a 2 and 1/2 ton, it would be 30,000 B.T.U.'s. You can look at the model number of a unit and you will see numbers like this, 024, 2-ton, 030, 21/2 ton, and 036 a 3 ton unit and so on. Your compressor alone will be in the range of a 2 horse unit, which ever the brand of compressor they installed in it. Please don't forget to rate me on this as I know you will be kind. I will be here if you ever need help on repairs or trouble-shooting your unit in the future, just use my user name below.
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1 Answer

My weatherking outside compressor isn't big enough to handle my cooling needs. It is 1.5 ton unit, can I put a bigger ac unit onto this one without changing my heating system which is sufficient?


if your indoor unit is 1.5 ton the answer is no
if your indoor unit is 2.0 ton then you can jump to that size.
Note :your duct system may have been designed for a 1.5 ton and may need to be reconfigured for a size increase.
Your hvac contractor should know this?

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I have a Lennox CH23.51 series coil unit using R22 freon installed one year ago. Compressor is 9 years old. Down the road when replacing compressor (R410A ), will CH23.51 unit be compatible after changing...


This evaporator core is R-22 / R-410A compatible. The Thermostatic Expansion Valve (TXV) is for R-22. If retrofitting to R-410A, a new TXV metering device would be required, but the evap. core itself could be re-used (as long as you stick with the same Tonnage you have now). If upgrading to a higher tonnage system (like going from 4-Ton to 5-Ton), then you would need a totally new evaporator core.

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1 Answer

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Check the fan relay switch in the air handler.
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Check the fan blower wheel for binding.

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1 Answer

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If your outdoor fan is a vertical discharge in other words if the fan blows the air up from the top of the unit then one foot from house is fine, but if it is horizontal discharge or blows it out the side then the airflow needs to be directed away from the house or the unit needs to be moved away from the house far enough that it doesn’t restrict the airflow.
For the blower running on high speed a 4 ton unit is usually 1600 cfm so on low cfm it may seem like high speed. There should be some speed taps on the indoor pc board and if you look in your installation guide it should tell you what taps you need to get the lower airflow if its not correct.
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