Question about Frigidaire Heating & Cooling

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I have a 4-ton Frigidfaire air conditioning unit on my 2400 square foot home, but I am not receiving the cooling I should receive. My split system model is #: FT4BF-048K. My air handlers Model is #:B4VM-X48K-C. I suspect my problem may be duct size. What should be the sizes of supply and return ducts on this unit? Phone 941-776-9270.

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Hi, the ducts are 18" round at the beginning and branch out to smaller sizes for other rooms. 10" for living areas, 8" for bedroom, down to 6" for bathrooms if they have them.If this unit was just installed, I would recommend getting the contractor out and do a balance of the duct work as they should have installed hand dampers to balance out the system, so you will have equal air distribution throughout. I would have went with a 5 ton unit for 2400 SQ.' home, but that's what the contractor recommended. If its only been there a short time, get them back out there as you may have other problems. If its not a new system, it may need to be serviced, outdoor coil washed, you may have a small freon leak, anything could be wrong. This is what I recommend, call out the contractor.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor

Posted on Oct 01, 2010

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