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  1. #27
    Join Date
    Feb 2003
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    Wichita Ks
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    that's is what happens when you don't use a big enough fork lift.

  2. #28
    Join Date
    Aug 2007
    Location
    Southern NJ
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    You could check with Entech in Garland, Texas. They offer a variety of classes including overhaul of Trane Centravacs. If I remember correctly, they have a CVHE in the shop, you go through the classroom training and then you actually do the teardown. It is a great learning experience. You even come away with good service manuals. Take an extra suitcase fot the manuals you get. I took a class there 9 years ago and I would highly recommend them. As far as upgrading your chiller with controls, I would recommend leaving well enough alone as long as the existing controls are working well. I recently worked on a CVHE made in 1987 and it has the original controls. I had to replace the chilled water temp sensors and the controls work well. The machine runs like a champ.

  3. #29
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
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    Quote Originally Posted by gmanss454 View Post
    ... As far as upgrading your chiller with controls, I would recommend leaving well enough alone as long as the existing controls are working well. I recently worked on a CVHE made in 1987 and it has the original controls. I had to replace the chilled water temp sensors and the controls work well. The machine runs like a champ.
    keep in mind that your control panel is no longer available...if it goes bad during the operational season...you get to upgrade...not replace...unless you have a whole bunch of spare control panels laying around.
    "Right" is not the same as "Wise".

    Don't step on my favorite part of the Constitution just to point out your favorite part.

  4. #30
    Join Date
    Dec 2010
    Location
    San Bernardino, CA
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    49
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    Thread Starter
    I can't give the accounts away I was given several sites with CVHE's, I have a lot of experience with a wife variety of chillers, boilers, industrial refrigeration etc... The company lost a bunch of guys because a supervisor quit. They are putting there faith in me. The maintenance and service I just follow the Trane manual. I noticed today while I was there that one of the sensors on the purger appears to be off. My suction temp sensor was reading a few degrees less then my LL temp sensor. I'm in the process of rodding both condensers so I haven't had time to mess with it. Some of the leaks are visible at the gaskets on the shell small oil stains have developed and my sniffer goes off on the lowest setting. I haven't checked is there an auto-purger rebuild kit? I think I would have to recover it to change the sensor on the cylinder


    Sent from my iPhone using Tapatalk

  5. #31
    Join Date
    Nov 2008
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    435
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    Quote Originally Posted by whiteside2831 View Post
    I can't give the accounts away I was given several sites with CVHE's, I have a lot of experience with a wife variety of chillers, boilers, industrial refrigeration etc... The company lost a bunch of guys because a supervisor quit. They are putting there faith in me. The maintenance and service I just follow the Trane manual. I noticed today while I was there that one of the sensors on the purger appears to be off. My suction temp sensor was reading a few degrees less then my LL temp sensor. I'm in the process of rodding both condensers so I haven't had time to mess with it. Some of the leaks are visible at the gaskets on the shell small oil stains have developed and my sniffer goes off on the lowest setting. I haven't checked is there an auto-purger rebuild kit? I think I would have to recover it to change the sensor on the cylinder


    Sent from my iPhone using Tapatalk
    Do not be deterred.
    Get yourself a gantry, chain hoist and a few chains and the Trane CTV Service Guide 2.

    This will walk you through step by step with pictures.
    As for the time I recommend you to qoute.... I assume we all know you will not be making any money on this job. You do although need to put in reasonable quote if you plan to get the job. 80 hours is right out of the Trane Top Secret Quote Book.

    If you have the experience that you say you do it should not really be a problem. Be careful and don't tear anything up.

    If worst comes to worst you can always call someone to put it back together for you.

    To back track for a moment at that age the machine needs to be regasketed but if the truth be know you could probably achieve a decent purge rate by merely regasketing the economizer and replace the first stage tang operator.

  6. #32
    Join Date
    Oct 2006
    Location
    Central Texas
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    I'd be sure and get an overhaul form. Write down all measurements, compare them to Trane spec. Also record all measurements when you go back together to make sure you're in spec. Setting the oil seal is very important, also watch you're dowel pins.

  7. #33
    Join Date
    Dec 2008
    Location
    Dixiana, AL
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    2,625
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    Quote Originally Posted by triggerhappy View Post
    Do not be deterred.
    Get yourself a gantry, chain hoist and a few chains and the Trane CTV Service Guide 2.

    This will walk you through step by step with pictures.
    As for the time I recommend you to qoute.... I assume we all know you will not be making any money on this job. You do although need to put in reasonable quote if you plan to get the job. 80 hours is right out of the Trane Top Secret Quote Book.

    If you have the experience that you say you do it should not really be a problem. Be careful and don't tear anything up.

    If worst comes to worst you can always call someone to put it back together for you.

    To back track for a moment at that age the machine needs to be regasketed but if the truth be know you could probably achieve a decent purge rate by merely regasketing the economizer and replace the first stage tang operator.
    I'm not an advocate of some folks theory that these things have plutonium in them and can kill you with the slightest indiscretion, but surely you're saying this "tongue in cheek"? Please tell me that there's more to this than "get yourself a gantry, a chainfall, and a few chains"......

    "Careful and don't tear anything up"????? Tell me it ain't so!!!

  8. #34
    Join Date
    Nov 2008
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    He claims to have quite a bit of experience in the industry. Although alot of things he has said do not make alot of sense to me.

    So taking him at his word I was no farther along when I started doing teardowns.

    I was in quite the similar situation. Working for a contractor. I got a teardown manual and that is how I did my first machine with a helper that was no more than a pair of hands.

    Still doing it today. Working for Trane when the first 19XL came out I got the manual and did first teardown on that machine with no formal training.

    If you remember back to the old CTV-SG2 it tells you how to do it step by step pictures and all.

    If he is telling the truth about his experience he should be able to do it. I am sure he will not make money although.

  9. #35
    Join Date
    Feb 2005
    Location
    Florida
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    My question is why does anyone want to do tear downs? I worked for Trane in the 70's and got my fill, no thank you.

  10. #36
    Join Date
    Aug 2006
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    Mixing oil and fire with a big spoon.
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    Quote Originally Posted by jimp View Post
    My question is why does anyone want to do tear downs? I worked for Trane in the 70's and got my fill, no thank you.
    would you want a doctor working on you that has never seen the inside of a body?

    sure, i am finished with tear downs too (i hope) but i did quite a few (not Grahams quantities, but enough). i liked doing them. i felt great when the chiller had 2 purge minutes a year and most of that is from changing filters and such. i think that it makes you a better tech knowing how it works...from the inside-out.
    "Right" is not the same as "Wise".

    Don't step on my favorite part of the Constitution just to point out your favorite part.

  11. #37
    Join Date
    Mar 2004
    Location
    ottawa canada
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    3,292
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    Quote Originally Posted by jimp View Post
    My question is why does anyone want to do tear downs? I worked for Trane in the 70's and got my fill, no thank you.
    Teardowns once you have done a few are easy , figuring how you are going to rig everything safely is the hard part depending on the installation . You have to work smarter not harder . I rarely physically lift anything once everthing is in the chiller room thats what the gantry and surrounding piping etc if needed is for .
    When I do a teardowns its usually off season . It gets freakin cold up here . I know I would much rather be in a warm quiet chiller room with the tunes on than freezin my ass off up to my ass in snow on some roof changing ventor motors and heat exchangers on rooftop units that should have been blown off the roof years ago but people are too cheap to invest in replacement ,been there done that and had my fill of it .
    I know everyday where Im going to be and I get left alone to do it , no dispatcher asking me to go from here to there and back again and how long before you can go here again etc etc etc .
    I dont just do teardowns , its just my niche. I originally apprenticed as a Millwright in a brewery so big equipment is my thing . I enjoy doing start ups and installs,panel upgrades starter retrofits etc and dont mind doing rooftops in the summer if needed .
    But given the choice give me a chiller to work on anyday of the week . 99% of the time they just want you to fix it as they have a whole pile of people waiting for you to get it running .
    No "El Cheapo" equipment owner watching the clock and questioning your every minute and why and when and........ how much is this costing etc etc .
    And finally yes like Jay said .. When you have just spent 3 weeks doing a total rebuild and you push the button and it winds up transitions and purrs it really feels pretty damn good .
    A few years back I did a conversion on a big CV12 . They had a whole dog and pony show of engineers and suits etc show up for the button pushing . Once it started and loaded up a bit and calmed down I climbed up on that long vane operator bar on the front and balanced a Canadian dollar coin on edge on top of the motor and Yes it stayed there . One of the big cheese engineers shook my hand said "thats good enough for me great job, thanks " and the dog and pony crowd left they had seen enough . ...that was a pretty good feeling .
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage and yes it still gives me goosebumps
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    In the new big shop , greasin', oilin' . tweakin' n shinin' !!

  12. #38
    Join Date
    Dec 2010
    Location
    San Bernardino, CA
    Posts
    49
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    Thread Starter
    My experience with low pressure chillers is very little, so if I'm not making sense it's because I'm learning a lot these last few weeks about them. The customer was asking me about overhauling them because Trane told them it needed to be done. They have 45,000 hours +/- between them. I got more information about it today and I understand the situation further. I have most of tomorrow to test a few things. I have learned almost everything done in this industry by getting a manual and learning as I go, I'm mechanically inclined, I work on all kinds of things. Mechanics must have the right attitude, will power and know how. Someone built the **** so obviously we can fix it. Whether or not someone thinks I can is not a concern of mine, getting as much info to assess the situation is what I'm trying to do. So I appreciate the input good or bad. Only looking at the positives doesn't change the situation.


    Sent from my iPhone using Tapatalk

  13. #39
    Join Date
    Jan 2005
    Location
    Houston TX
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    988
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    whiteside2831 - If purge pumpout timer is set at thirty minutes and trips as you say a few times a day, you have many leaks or several big ones. If you are anticipating doing this I would check around for a manual along with weights of the components. You mention replacing the volute, whatever you mean by volute. If the main parts are broke or damaged then they get replaced. I have never had to replace then, except when a installing contractor dropped a chiller 10 floors to the ground. you replace the gaskets and "O" rings. Clean all the sealing surfaces, check clearances of seals, labys and impeller runouts and thrust. Mark everything with orientation as to where and how it fits. I haven't done as many as my Canadian friend, but I also tend to get butterflies when I go to push the button after a rebuild, You just never know. Like they say sh!- happens. Reset your purge time to 100 minutes (maximum allowed). Good luck - GEO
    Once in a while everything falls into place and I am able to move forward, most of the time it just falls all over the place and I can't go anywhere-GEO

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