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  1. #14
    Join Date
    Sep 2007
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    NH
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    Good catch. I just assumed it had a distributor. Haven't seen a new WI evap without on in the last 20 years lol.

  2. #15
    Join Date
    Jul 2000
    Location
    Guayaquil, EC
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    Quote Originally Posted by Dchappa21 View Post
    Good catch. I just assumed it had a distributor. Haven't seen a new WI evap without on in the last 20 years lol.
    Typically an evaporator with a capacity less than 6000 Btuh or so won't use a distributor because one coil circuit is sufficient. Take a look at coils you're working on and count the number of circuits they have and compare that to the nominal capacity.

  3. #16
    Join Date
    Sep 2002
    Location
    Virginia
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    Thread Starter
    this walkin has 2 caps coming off distributor , so 2 circuits

  4. #17
    Join Date
    Jul 2000
    Location
    Guayaquil, EC
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    Quote Originally Posted by Snapperhead View Post
    this walkin has 2 caps coming off distributor , so 2 circuits
    Yes. Two circuits...so it needs a distributor...and so it also needs the external equalizer.

    What's the evaporator model number?

  5. #18
    Join Date
    Mar 2015
    Location
    Medford, N.Y.
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    Quote Originally Posted by icemeister View Post
    The determining factor on whether the evaporator needs an externally equalized TXV is if it has a distributor or not.

    If the coil has a distributor, then there will be roughly a 35 psi pressure drop across the distributor and distributor tubes, which is the reason an externally equalized valve is necessary. Whereas if there's no distributor...ie, a single coil feed and not multiple distributor tubes...then there will be no such pressure drop and so the externally equalized valve is not needed.

    I looked at the Trenton TLP low profile coils specs and it states the TLP-104M doesn't have a distributor nozzle and so that model doesn't need the external valve. If you have the TLP-106M, then it does need the externally equalized valve. (See p.29):

    http://docs.t-rp.com/1087151.pdf
    Is that "N/A" (pg #29)in reference to the "nozzle",mean that the nozzle has to be field installed vs "factory installed"? As in the nozzles that come in the clear plastic bag?

  6. #19
    Join Date
    Jul 2000
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    Guayaquil, EC
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    Quote Originally Posted by TechmanTerry View Post
    Is that "N/A" (pg #29)in reference to the "nozzle",mean that the nozzle has to be field installed vs "factory installed"? As in the nozzles that come in the clear plastic bag?
    It simply means that the coil model TLP-104M doesn't have a distributor to put the nozzle into. This is because the coil only has one circuit being fed, so no need for a distributor.

    These coils will usually come with a straight 1/2" OD coil inlet where the distributor normally would be. They used to be 1/2" flare connections until the industry became allergic to mechanical connections.

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