Results 1 to 5 of 5
  1. #1
    Join Date
    Jun 2002
    Posts
    460
    I'm wondering if a TXV is required to prevent floodback to the condensor when you have a variable-speed blower (specifically when using the dehumidifying features of such systems like a period of slower fan operation at the beginning of the cooling cycle).

    In this case the condenser is a 2.5 ton XL1200 and the furnace is a Trane TUD080R9V3. I'm pretty sure it's a 3-ton Trane evaporator coil also.

    (Long story: Builder lost original coil during remodeling project and replaced it with a new one. I'm not sure if the original one was installed with a TXV or not but they definitely didn't put a TXV on when they replaced the coil and I'm trying to be sure this isn't a problem.)

  2. #2
    Join Date
    Jan 2002
    Location
    Ft.Worth,Tx
    Posts
    4,581
    I need model # of coil to answer if it came with TXV.

    Most Trane dealers do put txv's on variable drive systems.
    "Everyday above ground, is a good day".
    "But everyday that you have made a difference in someones life, may insure you stay above ground a little longer".<aircooled>

  3. #3
    Join Date
    Jun 2004
    Location
    4H: Hot, Humid Houston H.O.
    Posts
    3,304
    My dealer installed a similar VS furnace, AUD080R9V4 in the American Standard line, on each of my 2 AC systems. One had a TXV added on his recommendation, but he did not inform me it was a must. The other is a rather old Intertherm system due for replacement in the next year or two. It does not have a TXV. If this is mal-practice then I would like to know too.

    Best of luck -- P.Student

  4. #4
    Join Date
    Jun 2002
    Posts
    460
    Originally posted by aircooled53
    I need model # of coil to answer if it came with TXV.

    Most Trane dealers do put txv's on variable drive systems.
    I don't think the original coil was a trane coil, so if it had a TXV then it was added by the contractor who installed it. (The original coil model number was HCC-17HH52236, which doesn't look like a Trane number to me). It was originally installed about 4 years ago.

    Sorry for a dumb question, but you would presumably see the TXV in the liquid line just outside the coil, yes? (or do they make them integral with the coil now)


  5. #5
    Join Date
    Apr 2003
    Location
    Eugene, Oregon
    Posts
    1,209
    TXV's are always the better way to go.
    Proud supporter of Springfield Millers and Oregon Ducks.

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