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  1. #1
    Join Date
    May 2003
    Posts
    6
    If one decides to lower the cfm per ton in hope to achieve better humidity removal (say from 400 to 325cfm per ton), should the charging system be rechecked/adjusted to manufacturers spec afterwards or do you leave it at its defaulted original setup (400cfm)...unit 14seer Ruud w var speed fan coil w/txv....

    Respectfully yours,

  2. #2
    Join Date
    Apr 2004
    Posts
    7,680
    Altering the airflow generally alters the charge. If you have a TXV its probably not a problem. Remember the factory charge is for the unit, 25' of lineset, the coil and 400 CFM. A piston system should be safe but should be checked.

  3. #3
    Join Date
    Jul 2005
    Location
    south
    Posts
    602
    try addinng a humidistat to maintain humidity. humidistat can be wired to turn on 1 stage of electric heat to force ac operation withot overcooling space temp. i have done this in several commercial applications and it works great

  4. #4
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    5,034
    Originally posted by xbcm
    If one decides to lower the cfm per ton in hope to achieve better humidity removal (say from 400 to 325cfm per ton), should the charging system be rechecked/adjusted to manufacturers spec afterwards or do you leave it at its defaulted original setup (400cfm)...unit 14seer Ruud w var speed fan coil w/txv....

    Respectfully yours,
    The proper sizing of the A/C system is the most critical factor to achieve sufficient runtime to bring humidity down.
    With adequate runtime 350-cfm per ton should do the job.

    No problem with the charge with the TXV, as you may want to ramp up to 400-cfm per ton again.

    http://www.udarrell.com/ac-trouble-s...ubcooling.html

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