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  1. #1
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    10 ton Carrier Cond on a 7.5 AHU

    With a 7.5 ton TXV. R410A

    This is on sight at a rig on a SCR house.

    Curious as to why they would size these units like this.

  2. #2
    Join Date
    Jun 2011
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    Houston area
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    Doesn't seem like a good idea.
    The picture in my avatar is of the Houston Ship Channel and was taken from my backyard. I like to sit outside and slap mosquitos while watching countless supertankers, barges and cargo ships of every shape and size carry all sorts of deadly toxins to and fro. It's really beautiful at times.....just don't eat the three eyed fish....

    ¯`·.¸¸ .·´¯`· .¸>÷÷(((°>

    `·.¸¸..· ´¯`·.¸ ¸.·´¯` ·.¸>÷÷(((°>

    .·´¯`· .¸>÷÷(((°>

    LMAOSHMSFOAIDMT

  3. #3
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    Im tryinf to wrap my head around it. Brand new equipment from a major manufacturer of Drive houses.

    High head, low suction, managed to with some adjustment get decent superheat.

    Some tool pusher said they've always been like that ?

    At least install a ERV on the damned thing.

  4. #4
    Join Date
    Jan 2008
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    Dallas ,Texas
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    Quote Originally Posted by Six View Post
    Im tryinf to wrap my head around it. Brand new equipment from a major manufacturer of Drive houses.

    High head, low suction, managed to with some adjustment get decent superheat.

    Some tool pusher said they've always been like that ?

    At least install a ERV on the damned thing.
    Does it pull in any outside air?
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  5. #5
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    Mar 2012
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    Quote Originally Posted by Dallas Duster View Post
    Does it pull in any outside air?
    No... No inside air.

    Are you sure it's 10 ton comp? Is it a wall pack or split?

    If It is a split , is the ahu broke into stages?

    "Duct tape is like the force. It has a light side, a dark side, and it holds the world together."

  6. #6
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    Quote Originally Posted by Dallas Duster View Post
    Does it pull in any outside air?
    No it's on a Natural Gas Drilling Rig. It's a trailer sized building where all the VFDs ,breakers, PLCs and disconnects are located. It's basically sealed with the exception of the occasional rig hand walking through.

    Checked data tags, 120k Condensers and 90K AHUs.

    Because of the drives they usually operate under a decent amount of load. According to a couple a rep from the company that builds the houses it's done for high Ambient reasons......huh ?

    I responded with that doesn't make any sense and they're are better ways of doing that.

    Who knows.

    With it running it's what you would expect from a system that's that mismatched with an oversized compressor.

    I told him if you " HAVE " to do this install ERVs.

  7. #7
    Join Date
    Mar 2003
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    7,321
    sometimes they go for colder coil to get lower dewpoint coming off of it. this changes performance. look at submittals. on units with outside air or infiltration issues. I have seen 2000 cfm air handlers mated to 12 ton condensers, delivering 45 degree air

  8. #8
    Join Date
    Mar 2012
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    My house is in Texas..
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    What rig is it? On SCR houses the cond. units are right near the large transformers and 9 times out of 10 it's Insanely hot back there. Perhaps they over sized to adjust to the outside heat.... Does it have a receiver ?

    Is is a specific systems ?
    Or a Custom Cooling Controls?

    "Duct tape is like the force. It has a light side, a dark side, and it holds the world together."

  9. #9
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    Mar 2012
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    Name:  ImageUploadedByTapatalk1340762164.528979.jpg
Views: 276
Size:  32.9 KB

    "Duct tape is like the force. It has a light side, a dark side, and it holds the world together."

  10. #10
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    Quote Originally Posted by AddMore22 View Post
    What rig is it? On SCR houses the cond. units are right near the large transformers and 9 times out of 10 it's Insanely hot back there. Perhaps they over sized to adjust to the outside heat.... Does it have a receiver ?

    Is is a specific systems ?
    Or a Custom Cooling Controls?
    Not a Custom Cooling Controls unit. Not a pressurized room either.

    Sure they're located next a big Xformer and a huge set of brake resistors...I think that's what they are.

    They absorb reverse EMF when the motors spool down and stops. Discharges the excess heat through louvers.


    Oh and No receiver. Just your basic commercial grade 3 phase mismatched unit.

    High load inside and high load outside is the typical application.

    I guess the reason could be High Ambient but like I said there are better ways to address high ambient issues. How about installing a condensing unit rated for more than 90 degrees Fahrenheit ?

    They're actually moving away from the splits and going with "homemade" wall mount and package units.

    Made in Houston and not even UIL approved. I think the homemade ones are made by a company called "Mustang" I could be wrong.

    Got a good look at one of them the other day.

    Just a hodge podge of motors, coils, contactors and a Copeleand compressor. Whatever Johnson Supply carries.

    I mean that. It looks like they went on a shopping spree through Johnson supply and then went back to the shop and built a A/C unit.

    Complete junk IMO. Its the inevitable consequence of letting the bean counters call the shots.
    Last edited by Six; 06-26-2012 at 10:15 PM. Reason: Cuz I like to party...

  11. #11
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    Mar 2012
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    Lol... The company I work for builds custom units for that exact reason .... I do not work in shop, so I don't know all the details.

    "Duct tape is like the force. It has a light side, a dark side, and it holds the world together."

  12. #12
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    You work offshore right ?

  13. #13
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    Mar 2012
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    Most of the time

    "Duct tape is like the force. It has a light side, a dark side, and it holds the world together."

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