Results 1 to 8 of 8
  1. #1
    Join Date
    Sep 2011
    Location
    Augusta, ME
    Posts
    76

    TEV or Compressor

    Hi guys I am a newer tech in the field and I always seem to have a hard time determining if the compressor is the cause for low refrigerant flow, or the TEV is the cause. I realize you can take amp readings at the compressor and compare to FLA. But I was looking for some methods, measurements, and tricks to making the proper diagnosis from some of the more experienced techs using this forum.

  2. #2
    Join Date
    Oct 2003
    Location
    las vegas
    Posts
    1,505
    accurate gages & thermometers will answer your questions.
    get a few more posts & apply for pro stayus & youll get
    a lot more help.

  3. #3
    Join Date
    Dec 2011
    Location
    Davenport Iowa
    Posts
    1
    This is a really great question as I see technicians time and time again who have trouble making the correct diagnosis when confronted with this issue! I have always had great luck checking the head temperatures on larger reciprocating compressors! A failed suction valve that allows discharge gas back into the piston chamber for re-expansion will send the compressors head temperatures through the roof! Hope this helps and I am really excited to hear everyone elses thoughts on this matter!

  4. #4
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,386
    Quote Originally Posted by sgagne199 View Post
    Hi guys I am a newer tech in the field and I always seem to have a hard time determining if the compressor is the cause for low refrigerant flow, or the TEV is the cause. I realize you can take amp readings at the compressor and compare to FLA. But I was looking for some methods, measurements, and tricks to making the proper diagnosis from some of the more experienced techs using this forum.
    read up on performance analysis.

    Each manufacturer offers performance charts. This allows you to predict the precise operating amperage for a given compressor under a given set of circumstances.

    I use this method quite frequently to determine a bad compressor and it has been 100% accurate.
    Last edited by jpsmith1cm; 12-04-2011 at 04:33 PM. Reason: typo

  5. #5
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,386
    Quote Originally Posted by marvin View Post
    accurate gages & thermometers will answer your questions.
    get a few more posts & apply for pro stayus & youll get
    a lot more help.

  6. #6
    Join Date
    May 2003
    Location
    Utah
    Posts
    718
    Quote Originally Posted by sgagne199 View Post
    Hi guys I am a newer tech in the field and I always seem to have a hard time determining if the compressor is the cause for low refrigerant flow, or the TEV is the cause. .
    The TEV superheat reading (at the sensing bulb location) will tell you if the valve if feeding correctly or not.

    High superheat = low refrigerant flow.

    Then the fun begins in determining why the superheat is high.

  7. #7
    Join Date
    Apr 2005
    Location
    Australia : Queensland
    Posts
    782
    Quote Originally Posted by jpsmith1cm View Post
    read up on performance analysis.

    Each manufacturer offers performance charts. This allows you to predict the precise operating amperage for a given compressor under a given set of circumstances.

    I use this method quite frequently to determine a bad compressor and it has been 100% accurate.

    Totally agree , a compressor efficiency test will tell you with 100% accuracy if it is doing the job it has been designed to do.
    The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman.

  8. #8
    Join Date
    Sep 2011
    Location
    Augusta, ME
    Posts
    76
    Your responses guys are a very good help. This site is an excellent source of knowledge and experience and is great for newer technicians learning the trade.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event