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  1. #1
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    Oct 2010
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    Coral Springs, FL
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    Confused High superheat TRANE Voyager (2006)

    I have been PMing some 20ton TRANE Voyager 2006 RTU's and have been high superheat readings and somewhat elevated subcools. I am in South Florida and at design conditions of 95* ambient/ 74* indoor drybulb/ 50% RH, I get a 59* supply air temp and a 72* return air temp (on average, I am dealing with multiple units in multiple buildings. My superheat can be 25-30* and a subcool of 15-17*. The automation space temp is set at and reading 74*. Any feedback on this? These units have DX coils that are metered by a distributor with a fixed bore in each tube at the evap inlet

  2. #2
    Join Date
    Nov 2006
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    Southeastern Pa
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    This is tech to tech RESIDENTIAL. (now moved by the mods to commercial)

    Voyagers are commercial equipment.

    Are you an HVAC technician by trade?
    Last edited by timebuilder; 07-04-2014 at 10:11 AM.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  3. #3
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    Oct 2010
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    Yes I am a tech by trade, however, I am not a website navigator by trade. If you would like to help me, I would be grateful. If not I guess I will need to speak to TRANE engineering & tech support. I just figured that I would throw this troubling question out there to this forum....figured it may help me and other techs. thanks for the help

  4. #4
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    Nov 2006
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    Southeastern Pa
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    Good. Allow me to give you some tips.

    When visiting a new website, clearly identify yourself and your experience level by posting an initial, "hi, I live in xxx city and state (province) and I work in the resi/commercial/industrial market."

    That way, we can know whether you are an amateur who should be posting in AOP, such as a DIY building guy who is trying to avoid hiring a contractor. It's good to know who is here, and whether they are following the rules.

    Now, back to why you are here.

    Is there a problem with the performance of these units that you wish to address?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  5. #5
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    Nov 2006
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    What target superheat have you calculated for the conditions?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  6. #6
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    Coral Springs, FL
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    Yes there is a problem with performance, and I apologize for the lack of forum etiquette. I have found the area to post. I have been in the trade for 18+, I live in south Florida. I work in heavy to light commercial RTU's & chillers.

  7. #7
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    Oct 2010
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    Coral Springs, FL
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    I have been adamantly told by my boss that the target SH is 12*. In watching these systems operate, I am beginning to question that target. could the target be more so towards 20?

  8. #8
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    when I do the formula, I get a 12* calculation

  9. #9
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    Oct 2010
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    Coral Springs, FL
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    3x 65*(WB) -80-95* ambient / 2. These units act as though there may be some sort of restriction, only in circuit #1 (there are 2 circuits with #1 running in both stage 1 & 2 cooling)

  10. #10
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    Good. It's not so much a case of etiquette, but one of controlling how much information gets posted in these open forums, since they get indexed by the search engines, and can be used for DIY purposes, which put the DIY practitioners in danger.

    If you are calculating a target of 12°, and you are getting as high as 30°, then yes, I would say that there is a Trane fixed orifice issue unless there is a dryer restriction. I have yet to find a dryer restriction relating to this particular Trane issue, but I have found a plethora of restricted orifices. Trane used to make a TXV conversion kit for this problem. One very clever guy has a video he made that shows him using access tubes he installed in holes he drilled in the manifold. Of course, you can identify clogged orifices by following the example he used in his video. I don't have the link handy, but I'll bet you can find it with a search.

    There is a lot of great help here. Most of the deeper technical chat happens in the Pro forums, because the search engines can't get to those areas. Pro membership is free, and it only takes 15 posts to apply. See the link in my signature block.

    You might consider filling out your profile in your user control panel area.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  11. #11
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    Coral Springs, FL
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    I can understand and appreciate the idea of protecting DIY. Your feedback affirms my diagnosis, now to fix the problem with out telling this poor customer that they need new units! I believe that there is a solution to the problem way before the need to sell a piece of equipment. I will definitely search for the suggestion you provided and will work my way to the professional member area. Thanks very much for your help. Have a safe holiday.

  12. #12
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    Nov 2006
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    You do as well.

    I agree that there is no need to replace a 10 year old Voyager.

    One way to reduce the chance of this problem happening on other units is to make sure the coils are as clean as can be. Split apart, cleaned with a strong cleaner, and rinsed thoroughly. It's the paraffin compounds that come out of the refrigerant oil that lodges in the orifices.

    But for right now, you should confirm no temp drop across the dryer, and then look after your orifice issue.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  13. #13
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    Oct 2010
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    Coral Springs, FL
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    Will do, thanks so much

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