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  1. #40
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,893
    Quote Originally Posted by Dallas Duster View Post
    I guess the boss wins over common sense what is there a whopping 9 pounds or refrigerant in that machine.
    8.6 lbs. There's about eleven in it now!!!!

  2. #41
    Join Date
    Jul 2003
    Location
    Orange County N.Y.
    Posts
    1,176
    Quote Originally Posted by KB Cool View Post
    Yeah i blocked off the condensor to 120 CST and gave it 18 SC.
    Too much subcooling for a 410a unit with microchannel coils.

    ...Ron
    Roof Rat

  3. #42
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
    Posts
    13,833
    Sometimes EEV controls condenser fans.

    This could do it.

  4. #43
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,893
    Quote Originally Posted by rscamaro View Post
    Too much subcooling for a 410a unit with microchannel coils.

    ...Ron
    Why? IOM says 15-17. I figured 1 degree over aint gonna matter.

  5. #44
    Join Date
    Mar 2011
    Location
    East Coast FL
    Posts
    1,059
    The digital scroll is actually a cool
    device. It allows a greater range of capacity control than traditional unloaders on a recip.

    It is designed to load / unload frequently to deliver a specific output. 40% load time = 40% capacity. Better load matching.

    Most units are sized for peak load and run there a small percentage of time. So you have an oversized 10 ton scroll cycling on and off. Over and over. Hard on the compressor for sure. This compressor can stay running and stay healthy.

    Oil management with these is a whole different topic.

  6. #45
    Join Date
    Jan 2005
    Posts
    604
    Quote Originally Posted by KB Cool View Post
    Why? IOM says 15-17. I figured 1 degree over aint gonna matter.
    Damn, I swore to myself that I was done with this.
    I'm weak.

    Do the words "critical charge" ring a bell?

    Best of Luck :

    Dick

  7. #46
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,893
    Quote Originally Posted by Carrene #2 View Post
    Damn, I swore to myself that I was done with this.
    I'm weak.

    Do the words "critical charge" ring a bell?

    Best of Luck :

    Dick
    Come on! Who's to say my thermocoupler aint off by 2 degrees!!!

  8. #47
    Join Date
    Jul 2003
    Location
    Orange County N.Y.
    Posts
    1,176
    Quote Originally Posted by KB Cool View Post
    Come on! Who's to say my thermocoupler aint off by 2 degrees!!!
    With the microchannel coils I pretty much always go to the low side, and I don't think 15-17 degrees SC is correct for the microchannel unit, I may be wrong but I don't think so. Sounds right for the standard copper/aluminum coils though.

    If you haven't seen just what the MC coils look like, you really need to take a look. What you have is pretty much a 1"x 1/8" flat piece of aluminum with say 10 to 15 capillary tubes running the length of the aluminum bar. They don't hold very much refrigerant in them. It is very easy to trip the HP switch with even a slight overcharge.

    ...Ron
    Roof Rat

  9. #48
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,893
    Ok i'll keep that in mine if i have to go back!! I figured i couldn't go wrong by following the manual's charging instructions!
    Attached Files Attached Files

  10. #49
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,723
    You do what ever you want to it It's the customers machine and he can pay you to make any modifications to it that he wants. For all I care you can put a TXV on it and go with it.


    Quote Originally Posted by KB Cool View Post
    Ok i'll keep that in mine if i have to go back!! I figured i couldn't go wrong by following the manual's charging instructions!

  11. #50
    Join Date
    Jan 2007
    Location
    Stongsville Oh
    Posts
    904
    Carrene #2 you made the most sense. I figured a plugged drier but couldn't figure high pressure trips. I also assumed a pressure switch not a DDC controller. I am not familiar with the equpment being described. Was this an actual pressure switch shutting the comp down or a program in the controller? What brand?
    ckartson
    I didn't write the book I just read it!

  12. #51
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,893
    Quote Originally Posted by Dallas Duster View Post
    You do what ever you want to it It's the customers machine and he can pay you to make any modifications to it that he wants. For all I care you can put a TXV on it and go with it.
    Yeah, it'll be a good learning experience!!!

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