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    llama's Avatar
    llama Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Jan 23, 2009, 09:10 AM
    Oversized evaporator air conditioning coil
    Hi,

    I have a used furnace with a 5 ton evaporative coil on it. I want to connect it to a 3.5 ton compressor. Any potential problems? Seems like it would be slightly more efficient.

    llama
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 23, 2009, 03:51 PM
    There are many potential problems but they can be overcome with the proper parts and a professional service person in the HVAC trade.

    The unit will need a expansion valve installed on the coil. The TXV should be externally equalized and adjustable. It would also be good if it has a built in pressure balance circuit so additional start components will be kept to a minimum.

    Once in operation then the TXV will need to be adjusted to the correct super heat setting. The pressures will be a bit different that a matched evaporator but the larger coil surface of the bigger coil will allow more moisture removal and slower blower motor speed if desired.
    llama's Avatar
    llama Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Feb 20, 2009, 02:32 PM
    HVAC 1000,

    Thanks for your input.

    Quote Originally Posted by hvac1000 View Post
    There are many ....... speed if desired.
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