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Thread: 19DH5764c2

  1. #1
    Join Date
    Oct 2005
    Location
    Las Vegas
    Posts
    45

    19DH5764c2

    I have a Carrier 19 DH that is going to be mine. My centrifugal is limited to turbo core compressors. I'm going to be firing up a 19DH after it has not run for a year or so due to operator knowledge (my customers).

    We are cleaning the condenser (punching the tubes) then going to restart the machine. There is a concern that it may be low on charge (R-11). My PT chart tells me it will run in a vacuum on the suction side and low pressure on the discharge side. In my 12 years as a tech I have mostly worked with 22 ranged pressures. So never having had to check for leaks on a system like this (low pressure) will the normal methods I use for R22 be OK?

    I have the IOM for this chiller, What other material I can read to get me better prepared for this style machine?

    If there is more info needed, or you would rather not post it here, I can PM you my cell or I could call you. Up to you.

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,174
    Moved to chillers forum
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    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  3. #3
    Join Date
    Jul 2006
    Location
    The Great country of Texas
    Posts
    429
    Quote Originally Posted by rbcsj View Post
    I have a Carrier 19 DH that is going to be mine. My centrifugal is limited to turbo core compressors. I'm going to be firing up a 19DH after it has not run for a year or so due to operator knowledge (my customers).

    We are cleaning the condenser (punching the tubes) then going to restart the machine. There is a concern that it may be low on charge (R-11). My PT chart tells me it will run in a vacuum on the suction side and low pressure on the discharge side. In my 12 years as a tech I have mostly worked with 22 ranged pressures. So never having had to check for leaks on a system like this (low pressure) will the normal methods I use for R22 be OK?

    I have the IOM for this chiller, What other material I can read to get me better prepared for this style machine?

    If there is more info needed, or you would rather not post it here, I can PM you my cell or I could call you. Up to you.
    If the machine is sitting positive now, leak check it using standard leak detectors good for CFC, if not, you have two options. Run hot water through the evaporator to elevate the refrigerant pressure or remove the charge and pressurize with nitrogen and trace R-22 no more that 10psig. At 15psig, you will blow the rupture disc.
    "I'm from Texas, what country are you from?"

  4. #4
    Join Date
    Nov 2008
    Posts
    366
    If you have specific questions I am sure someone will be happy to answer them for you.

    But first off let me say that you are going to:
    A. Be prepare to violate a few EPA regulations or
    B. Buy some pretty expensive equipment to do low pres. work

    You have to decide if it is worth it for just one machine.

    Not trying to discourage you but if you have the building uder contract you may want to sub out the chiller work. We sub to quite a few contractor in our area that have the building. You just have to find a company that will not try to take the building.
    We have a good relationship with our contractors and can say that as far as I know we have never tried to step in on their air side work in these buildings.

    With all that said what would you like to know?

  5. #5
    Join Date
    Oct 2005
    Location
    Las Vegas
    Posts
    45
    We do have chillers in our contracts listing, mostly recips and screws around 300 tons & below. I've been working on those off and on for a few years So I am familiar with them. I know centrifugal chillers are different and for tear down work, that will get subbed out, not that handy with a micrometer....yet. I want to push forward into this area & am willing to read what I need to, buy what I need (or get the company to get it).

    For now, this chiller is being given to me to get running, so that's what I plan to do.

  6. #6
    Join Date
    Nov 2008
    Posts
    366
    send me your email address and I will send you some stuff.

  7. #7
    Join Date
    Jan 2008
    Location
    windy city
    Posts
    4,437
    trigs will set you up. iffen you have more qwestions, just post

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