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  1. #1
    Join Date
    Jun 2008
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    South,Tx
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    331

    For those Pros out there, reading a Flowrator S.H and Sub-cooling

    How is it when i go on S.C. i allways have problems reading S.H. and Sub-cooling with a flowrator system , and its not as accurate a TXV.
    Some one give some ideas about this , and how to go about it !
    Matt 7:12 The Golden Rule
    "Do for others what you would like them to do for you. This summary of all is taught in the law and the prophets.

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,108
    No idea why you have trouble.

    Don't know what you mean not as accurate either.
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  3. #3
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
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    6,058
    You gottta re word that a little differently. It's not clear what you mean.

  4. #4
    Join Date
    Jan 2002
    Posts
    44
    a TXV - use sc to maintain a collum of liquid at valve and constant evap sh, caps and flow devices - use sh which is dependant on condenser pressure for flow, greater cond pressure greater mass flow. Question a little unclear hope this helps

  5. #5
    Join Date
    Jun 2008
    Location
    South,Tx
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    331
    Quote Originally Posted by derbysr View Post
    How is it when i go on S.C. i allways have problems reading S.H. and Sub-cooling with a flowrator system , and its not as accurate a TXV.
    Some one give some ideas about this , and how to go about it !
    The temputures dont seem to be steady the , sub-cooling goes up with time and i got a 10 * swing up and down on S.H . Like an example like this
    54* to 44* and then up she goes and then down to the same bottom line 44* .
    Matt 7:12 The Golden Rule
    "Do for others what you would like them to do for you. This summary of all is taught in the law and the prophets.

  6. #6
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
    Posts
    6,058
    Quote Originally Posted by derbysr View Post
    The temputures dont seem to be steady the , sub-cooling goes up with time and i got a 10 * swing up and down on S.H . Like an example like this
    54* to 44* and then up she goes and then down to the same bottom line 44* .
    Is this a fixed metering device or TXV you're refering to?

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,108
    A fixed metering device system will sometimes hunt when its low on charge.
    It also appears to hunt sometimes after the coil has been frozen. Due to oil having been washed out of the compressor, and now moving through the evap.


    Have you applied for pro membership yet.

    These are question that are more technical in nature then we should be going into in the open forums..
    They may close or delete it soon.
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  8. #8
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
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    Quote Originally Posted by beenthere View Post
    A fixed metering device system will sometimes hunt when its low on charge.
    .
    ??????????????????????????

  9. #9
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    Quote Originally Posted by hvaclover View Post
    ??????????????????????????
    And your question is???????????????????????????????????????????????? ?????????????????????????????????????????????????? ??????????



    Is this a technical question for the resi area, or one that should be in the pro area.
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  10. #10
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
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    Not so sure hunting is a word that I would use in conjunction with a fixed bore metering device.

  11. #11
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    Won't say its 100% correct terminology, but close enough for me.
    I failed Terminology 101.
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  12. #12
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
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    6,058
    C'mon man! How's that being fair to the OP?

  13. #13
    Join Date
    Jan 2004
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    Lancaster PA
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    Because that is what very well may be happening.

    And I'm not allowed to explain it much better in this forum.
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