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  1. #14
    Join Date
    Sep 2008
    Location
    Western PA
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    25,667
    Yep..

    Add some gas and you will settle down.

    Probably even bring your suction pressure down, too.

    Bonus points for the OP if he can explain why suction will drop...

  2. #15
    Join Date
    Sep 2008
    Location
    Western PA
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    Quote Originally Posted by Southern Mech View Post
    I really reccomend you learn what this is, the superheat / subcool as you can not diagnose a refrigeration issue w/o this. It's kinda like your blood pressure
    I could not agree with this post more.

    You NEED to understand subcooling and superheat before you can consider yourself competent in this field.

  3. #16
    Join Date
    Jul 2010
    Posts
    53
    sorry for the confusion.. yes that is correct, I have about 12F of superheat and a couple degrees of subcooling, at best.. I had to run to grab some parts for another job, but will re-measure in a little while... as for now, I didn't want to add gas just yet.. wanted to be sure

  4. #17
    Join Date
    Jul 2010
    Posts
    53
    I keep mixing my lines up, and it came out in the form of subcooling/superheat confusion... yes, I have about 12F of superheat coming into the compressor via the suction line... the liquid line has nearly no subcooling to it.. I am going to re-attach the gauges in a bit, when I return to the site, to be sure of my numbers I quoted above.

  5. #18
    Join Date
    Jun 2003
    Location
    Gulf Coast
    Posts
    175
    Quote Originally Posted by 02powerstroke View Post
    Here is the situation... Design pressures are 150/300psi with 12 degree subcooling...

    Actual conditions are 92Psi liquid at a temperature of 69F. High pressure side is at around 220Psi and about 12F BELOW saturation temperature. Cooling isn't really doing much indoors and runs constantly.

    Is the compressor on the way out or is there a charge issue here. Forgive me as I am fairly new to the service industry.

    Thanks in advance guys
    Why is the design pressures so high 150PSI suction on R22. Where did you get the design pressures are you sure thats not the testing pressure?

  6. #19
    Join Date
    Jul 2010
    Posts
    53
    Quote Originally Posted by waltervan View Post
    Why is the design pressures so high 150PSI suction on R22. Where did you get the design pressures are you sure thats not the testing pressure?
    this was from the manufacturer's information... suction pressure will drop on the suction side when you add refrigerant since you have more refrigerant to absorb heat... since there is more refrigerant you will have more refrigerant to absorb the energy and will result in less liquid refrigerant turning into a gas, or vaporizing

    what do I get?

  7. #20
    Join Date
    Sep 2008
    Location
    Western PA
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    25,667
    Quote Originally Posted by 02powerstroke View Post
    this was from the manufacturer's information... suction pressure will drop on the suction side when you add refrigerant since you have more refrigerant to absorb heat... since there is more refrigerant you will have more refrigerant to absorb the energy and will result in less liquid refrigerant turning into a gas, or vaporizing

    what do I get?
    You get to try again......


  8. #21
    Join Date
    Jul 2010
    Posts
    53
    how so? It has to do with the heat absorbed by the refrigerant and the vapor pressure of the refrigerant coming back to the compressor... Guess I am a little lost as to what you are looking for here for an answer

  9. #22
    Join Date
    Jun 2003
    Location
    Gulf Coast
    Posts
    175
    Did I miss the Model Number if not I think we need it

  10. #23
    Join Date
    Sep 2008
    Location
    Western PA
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    Quote Originally Posted by 02powerstroke View Post
    how so? It has to do with the heat absorbed by the refrigerant and the vapor pressure of the refrigerant coming back to the compressor... Guess I am a little lost as to what you are looking for here for an answer
    Actually, it doesn't have as much to do with heat absorbed as it does with ********.

    Damn. I almost gave away the answer.

  11. #24
    Join Date
    Jul 2010
    Posts
    53
    Greater subcooling

  12. #25
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,667
    Quote Originally Posted by 02powerstroke View Post
    Greater subcooling
    If you have subcooling, what does that tell you?

    What difference would that make in the system?

  13. #26
    Join Date
    Jul 2010
    Posts
    53
    ?

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