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  1. #1
    Join Date
    Aug 2007
    Location
    ky
    Posts
    181

    He didn't know the difference between Zeroing and calibrating



    I left a comment but it has to be approved by him to be shown.
    Make me thinking about making a video on how to calibrate gauge instead of zeroing.

  2. #2
    Join Date
    May 2010
    Location
    Oxford, UK
    Posts
    336
    I don't think you can calibrate mechanical gauges, you can zero them, or set them to read, say 80psi, but the calibration is down to the mechanism and its state of repair.

    If they are not reasonably accurate across their scale its time for replacement.

  3. #3
    Join Date
    Aug 2007
    Location
    ky
    Posts
    181
    Quote Originally Posted by monkeyspanners View Post
    I don't think you can calibrate mechanical gauges, you can zero them, or set them to read, say 80psi, but the calibration is down to the mechanism and its state of repair.

    If they are not reasonably accurate across their scale its time for replacement.
    You are right.
    there is no way i could ensure the calibration across the scale.

    but my method is : tape a temperature probe to jug side and insulate the jugs. leave the jugs in a room that has pretty stable room temperature for about 24 hours or so.
    Hook the gauge to it and calibrate the gauge to the corresponding P/T chart.

    this will at least give me the confidence that the gauge is accurate at that particular pressure.

  4. #4
    Join Date
    Apr 2012
    Location
    Paper Street Soap Company
    Posts
    2,298
    Meh.....
    That isn't up to par with whats typically posted on the Wall of Shame.

    Technically not correct but it's really no big deal

  5. #5
    Join Date
    Jul 2012
    Location
    Athens, GA.
    Posts
    143
    He posted your comment and said thanks for clarifying. :thumbup:

    JASON sent this from his DUMB-PHONE

  6. #6
    Join Date
    Jun 2012
    Location
    Northern NV
    Posts
    124
    Put refrigerant jug (your choice of flavors) in ice, let it mellow a while and then check that the pressure reflects the 32F saturated vapor on your gauges!

    Melting ice is always 32F, or at least close enough for analog gauges.............

  7. #7
    Join Date
    Sep 2002
    Location
    I don't know
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    2,897
    This video is far worse:

    "Kung Fu Maintenance demonstrates how to charge an air conditioner through the suction side only by feel."

    General public's attitude towards our energy predicament: "I reject the reality of finite resource depletion and substitute it with my own; energy is infinite, we just need an alternative storage medium to run the cars on. The economy can grow indefinitely - we just need to "green" everything! Technology is energy! Peak what?"

  8. #8
    Join Date
    May 2009
    Location
    northern kentucky
    Posts
    143
    Haven't you ever heard of the beer can cold method of charging. It's the latest way of doing it.I think he would have been alot better off drinking that water rather than pouring it over a compressor that is running. Maybe that is how it is done on his planet.

  9. #9
    Join Date
    Sep 2002
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    I don't know
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    2,897
    He advocates only checking the low side, as if all problems are caused by not enough gas. Restriction or underfeeding txv? Better dump some gas in.

    How widespread is that practice?
    General public's attitude towards our energy predicament: "I reject the reality of finite resource depletion and substitute it with my own; energy is infinite, we just need an alternative storage medium to run the cars on. The economy can grow indefinitely - we just need to "green" everything! Technology is energy! Peak what?"

  10. #10
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,759
    Quote Originally Posted by amd View Post
    This video is far worse:

    "Kung Fu Maintenance demonstrates how to charge an air conditioner through the suction side only by feel."

    And then folows it up with a can of super seal

  11. #11
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by KB Cool View Post
    And then folows it up with a can of super seal
    And Zerol Ice!
    If more government is the answer, then it's a really stupid question.

  12. #12
    Join Date
    Jul 2007
    Location
    Beautiful, Philadelphia, the City of Brotherly Love!
    Posts
    1,075
    Now hold on who do you think teaches hacks? Right, the Hackmeister.

    You Tube has created an online Hack University.

    I took an extra 15 pounds of R-22 out of a unit that holds 14 pounds. The other guy also used the touchy feelie suction only charging method. He was confused on a subsequent call as to why the 40 amp breaker was tripping sometimes on start up, so a 60 amp breaker fixed that problem, but then the points on the contactor blew off three times.

    So this obviously meant the 2 year old unit needed to be replaced, mostly because he told her it already had a hard wired start cap and relay and they are the best or some such smoke and mirrors get out the door with a check explanation.

    I found a partially blocked liquid dryer at the air handler the frost was a dead give away.

    I am going to put up some video's under the handle Kung Po hvac.

  13. #13
    Join Date
    Sep 2002
    Location
    I don't know
    Posts
    2,897
    You Tube has created an online Hack University.
    There are some excellent youtube hvac channels, but they're probably outnumbered by the bad ones.
    General public's attitude towards our energy predicament: "I reject the reality of finite resource depletion and substitute it with my own; energy is infinite, we just need an alternative storage medium to run the cars on. The economy can grow indefinitely - we just need to "green" everything! Technology is energy! Peak what?"

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