semi hermetic checks
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  1. #1
    Join Date
    Jan 2010
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    13

    semi hermetic checks

    I have been doing HVAC for a few years now but I am new to these bigger comp. with unloaders and hot gas bypass. Is there a specific routine to do system checks? Even though cool outside should a adj to loaded and adj. for no bypass to check?

  2. #2
    Join Date
    Apr 2010
    Location
    Southeast
    Posts
    40
    My suggestion is first go to a Copeland or excuse me Emerson (because they own everything) training seminar. They even do tear downs. Look on Emerson's web site and they show when and where they will be held in various parts of the country.

  3. #3
    Join Date
    Jan 2010
    Posts
    13
    thanks for the response. I am actually signed up for a tear down class now. It's not by the 2 you named, but it's givin by the local supply house. I have alot of questions to ask. I hope they could help. Thanks again

  4. #4
    Join Date
    Oct 2001
    Posts
    6,931
    if the unloaders are electric they will cycle according to air or water temperature setpoints when they get reached when ativated suction guage rises and discharge dros along with the amperages.the hot gas works off suction pressure to put a false load into the evaporsters usually fully opened with 55 lbs on the suction with r-22 as the gas.
    "when in doubt...jump it out" http://www.youtube.com/watch?v=U1qEZHhJubY

  5. #5
    Join Date
    Jul 2009
    Location
    In a mechanical room....
    Posts
    1,887
    Copeland, Carlyle, dunham-bush and so on all have particulars, Oil level, that way the oil is distributed throughout the compressor, the way the valves/heads/plates function, Oil separators on low temps and other controls such as oil press switches are to also great to know, etc.... You can get great info from manufacturer web sights, classes and in the field.
    “It takes courage to grow up and turn out to be who you really are.”

    - E.E. Cummings

  6. #6
    Join Date
    Apr 2006
    Location
    mechanical room
    Posts
    1,255
    chrishvacman, nothing like good ol hands on experince though, just don't puch in one contactor on part winding start comp. and read read read

  7. #7
    Join Date
    Jan 2010
    Posts
    13
    Thanks for responding back. I did go to a Carlyle class, tear down. Learned alot. I think you guys are right. need to get my hands on while learning. Boy I have a long way to go.

  8. #8
    Join Date
    Sep 2005
    Location
    Texas
    Posts
    2,793
    Quote Originally Posted by coolerinfrederick View Post
    chrishvacman, nothing like good ol hands on experince though, just don't puch in one contactor on part winding start comp. and read read read
    lol...that's a high dollar boo-boo right there!

  9. #9
    Join Date
    May 2009
    Location
    Bardstown, KY
    Posts
    94

    Unloader Info

    Attached is some literature to help explain unloaders.
    Attached Images Attached Images

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