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  1. #1
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    Aug 2014
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    need to charge goodman units

    hello techs,i need to charge 2 rheem units with R410 for 1st unit with model#GSX130241DA,getting 120psi on low & 270psi on highside, compressor pulling 6amp rated for 13.5,my S.A 66F R.A 72F, 2nd unit R410 low 50psi & high 225psi,comp pulling 10AMP rated for 25AMP S.A 77F R.A 71F M#GSX130601BC,i strongly believe its a fixed metering device on both units since it doesnt have TXV & past experience working with rheem units is it best to recover & charge both units to factory charge or charge using superheat or subcooling,addition to charge issue seems like the return air for 1st unit comes from basment & office together with 2 seperate filter tracks & 2nd unit return comes from open space above cieling with no return duct both air handlers in basment, tryed giving much info as i can,any suggestions regarding proper procedure would help thanks.

  2. #2
    Join Date
    Jun 2018
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    Are you a tech?

    If its fixed orifice you need to figure out your target superheat. Going by temp drop or pressures won't get you far.

  3. #3
    Join Date
    Mar 2013
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    Billington Heights, NY
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    Quote Originally Posted by Dan_The_HvacMan View Post
    Are you a tech?
    MMMM... a Pro Member guarantees he's a tech. The little * guarantees it even more.

    Are you a tech, Dan the HVAC dude New Guest?
    This forum requires that you wait 20 seconds between posts. Please try again in 50 seconds.

    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"

    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

  4. #4
    Join Date
    Jun 2018
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    Didn't click on his profile so i didn't see the pro status, my bad.

    Yeah I'm a tech up in Canada. Just found this site though.

  5. #5
    Join Date
    Jan 2004
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    PA
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    Quote Originally Posted by nytech28 View Post
    hello techs,i need to charge 2 rheem units with R410 for 1st unit with model#GSX130241DA,getting 120psi on low & 270psi on highside, compressor pulling 6amp rated for 13.5,my S.A 66F R.A 72F, 2nd unit R410 low 50psi & high 225psi,comp pulling 10AMP rated for 25AMP S.A 77F R.A 71F M#GSX130601BC,i strongly believe its a fixed metering device on both units since it doesnt have TXV & past experience working with rheem units is it best to recover & charge both units to factory charge or charge using superheat or subcooling,addition to charge issue seems like the return air for 1st unit comes from basment & office together with 2 seperate filter tracks & 2nd unit return comes from open space above cieling with no return duct both air handlers in basment, tryed giving much info as i can,any suggestions regarding proper procedure would help thanks.
    Recover, vacuum, and weigh factory charge back in. Then check unit for proper operation, and adjust charge if needed.
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  6. #6
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    Aug 2014
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    Thread Starter
    Quote Originally Posted by beenthere View Post
    Recover, vacuum, and weigh factory charge back in. Then check unit for proper operation, and adjust charge if needed.
    that was a good recommendation,I wish other fellow pro member said something similar,thank you

  7. #7
    Join Date
    Aug 2014
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    Thread Starter
    I might asked a silly question dont mean I am not a tech,am sharing something I experience in field our company never use superheat or subcooling method people that will read this will " what kind of company is that",my boss is a smart man he knows from experience how to properly charge a system, I dont have much experience like him yet but will get jobs done with zero call backs, so when I have experience to share the response should be advisable,BUT ALL PRO TECHS ON THIS FORUM ARE ALWAYS HELPFULL.

  8. Likes HVAC_Marc liked this post
  9. #8
    Join Date
    Jun 2018
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    You should always be using subcooling and superheat for diagnostics and charging. On package units you can go by weight but on split units weighing in will get it right on most systems with linesets inside factory lengths but superheat and subcooling is needed to actually get the charge right.

    Just because your boss does it the wrong way doesn't mean you should. It takes 5 extra minutes to get your SH and SC.

    Beenthere was right though. The correct way to do it is recover, evacuate, weigh in to rating plate, fine tune with SH and SC.

    My apologies for assuming you weren't a tech. As stated before i never clicked on your profile to see and assumed based on the question.

  10. #9
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    Aug 2014
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    Thread Starter
    Quote Originally Posted by Dan_The_HvacMan View Post
    You should always be using subcooling and superheat for diagnostics and charging. On package units you can go by weight but on split units weighing in will get it right on most systems with linesets inside factory lengths but superheat and subcooling is needed to actually get the charge right.

    Just because your boss does it the wrong way doesn't mean you should. It takes 5 extra minutes to get your SH and SC.

    Beenthere was right though. The correct way to do it is recover, evacuate, weigh in to rating plate, fine tune with SH and SC.

    My apologies for assuming you weren't a tech. As stated before i never clicked on your profile to see and assumed based on the question.
    no worries,thanks

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