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Thread: rla/lra

  1. #1
    Join Date
    Aug 2011
    Location
    houston, texas
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    20

    rla/lra

    whats the differance in these two? i know they are run load amps and load run amps but there is a big differance in the numbers. my understanding is that rla is the amps being drawn while running but what is lra?

  2. #2
    Join Date
    Oct 2010
    Location
    SW Michigan, near Battle Creek
    Posts
    921
    Locked Rotor Amps. what the thing draws with no rotation-no back emf. untill the thermal safy trips or something melts wich ever comes first.

  3. #3
    Join Date
    Aug 2011
    Location
    houston, texas
    Posts
    20
    ok. that makes since. i dont know why a tech. told me they were called load run amps.

  4. #4
    Join Date
    Nov 2008
    Location
    Bristol Va.
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    539
    Quote Originally Posted by el_coyote2373 View Post
    i dont know why a tech. told me they were called load run amps.
    becouse he DID NOT KNKOW what it meant either.

    dogboy

  5. #5
    Join Date
    Jul 2011
    Location
    central Alabama
    Posts
    23
    I thought rla was rated load amps....just an engineer's estimation of what a motor will pull under normal load.

  6. #6
    Join Date
    Oct 2010
    Location
    SW Michigan, near Battle Creek
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    921
    there is a rated amps listed that is the motor working full-out

  7. #7
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
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    6,051
    If im drawing anthing close to full on RLA ....im looking for reasons why.

  8. #8
    Join Date
    Dec 2009
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    maroon lazyboy
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    1,049
    On a lennox (and probably others)

    rated load amps are the amps drawn during design conditions.

    Which is high OAT and high indoor load

    at least that's what I was told.

  9. #9
    Join Date
    Jul 2007
    Location
    Virginia
    Posts
    439
    Quote Originally Posted by knave View Post
    On a lennox (and probably others)

    rated load amps are the amps drawn during design conditions.

    Which is high OAT and high indoor load

    at least that's what I was told.
    Usually under normal conditions a compressor is going to pull about 75-80% of whats listed as RLA. At least thats what I've seen over the years.
    When you do a job, Always make it easier for the next guy, because you may be the next guy working on it.

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