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  1. #1
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    Amperage on condenser fan motor

    I installed a condenser fan motor that was running at 1.6 amps and was rated for 1.6 amps. Is this too close to rating ?? Should i be running slightly below rating on motor..?

  2. #2
    Join Date
    Dec 2002
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    Quote Originally Posted by jmiles View Post
    I installed a condenser fan motor that was running at 1.6 amps and was rated for 1.6 amps. Is this too close to rating ?? Should i be running slightly below rating on motor..?
    Did it say on the motor that the RLA was "rated load amps" sometimes mfg. RLA stands for "running load amps" I know Ruud it seems like forever has always had RLA as "rated load amps".
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  3. #3
    Join Date
    May 2007
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    Thought fan motors have one rating unlike a compressor.. With FLA and RLA distinction..

  4. #4
    Join Date
    Jun 2013
    Location
    N. Canada
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    RLA is "rated load amps".
    I even remember when this term was introduced in the 70's.

    That motor may be telling you that the rads not as clean as it looks!
    Check the charts re: SP vs HP.

  5. #5
    Join Date
    Sep 2008
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    VA
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    Quote Originally Posted by IRBH View Post
    RLA is "rated load amps".
    I even remember when this term was introduced in the 70's.

    That motor may be telling you that the rads not as clean as it looks!
    Check the charts re: SP vs HP.
    I agree, if your meaning of rad is condenser coil. Higher run current on axial blades indicates an airflow restriction.
    Typically I see FLA label about a 10th above of operational reading.
    "The only true wisdom is in knowing you know nothing" Socrates

  6. #6
    Join Date
    Sep 2002
    Location
    Virginia
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    3,179
    with fans , you want it to pull the amps written on the tag

    if it says 1.6 , then pulling 1.6 is perfect

    over amping , and under amping fan motors is Bad , they will get hot .

    compressors on the other hand , like to run a couple of amps Under whats written on tag

    weird huh ....

  7. #7
    Join Date
    Jan 2006
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    McQueeney, Texas
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    I agree- 1.6 is fine.

  8. #8
    Join Date
    Jun 2013
    Location
    N. Canada
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    Quote Originally Posted by Snapperhead View Post
    with fans , ..... under amping fan motors is Bad , they will get hot .
    weird huh ....
    Yeh, weird is the word. Or in old English, a load of crap!

    Think about it. You're a design engineer working on a new condensing unit. It calls for 5300cfm so you spec a 22" 27º fan run with a .5hp motor. So in a new rad it would be drawing full RLA. With a SF of 1 any load increase is overloading the motor. A small coil restriction to
    .10 SP Raises motor demand to .53 which is a 6% overload.
    They are not SUPPOSED to draw RLA.

  9. #9
    Join Date
    Sep 2002
    Location
    Virginia
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    IRBH .... 6 percent isnt going to be enough to raise concern.

    But like i said , you want it close to the tag rating

  10. #10
    Join Date
    May 2007
    Location
    california
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    223
    I ran a little test .. I blocked off 75% of the condenser with carboard and the amperage only moved from 1.6 up to 1.7 .. Dirty condensers make a miniscule difference inmho..

  11. #11
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
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    6,048
    Some good reading materials on the subjects.
    Attached Images Attached Images

  12. #12
    Join Date
    Jul 2011
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    East coast USA
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    972
    Quote Originally Posted by jmiles View Post
    I ran a little test .. I blocked off 75% of the condenser with carboard and the amperage only moved from 1.6 up to 1.7 .. Dirty condensers make a miniscule difference inmho..
    I glad you said that. I have battled many to make this point when dealing with coil cleaning-vs-money savings. I find it takes a lot in Most cases to warrant cleaning. if a system is running as designed, cleaning the coil will not make it run better also don't spend so much time killing yourself with bent fins. I have seen coils damaged by hail, run fine. The condenser coils are not sized for an exact ton. There is enough room that it takes a lot to jam it up...YES i know there are exceptions..but i rather clean my coils when i see a need and not have someone spray chemicals on them every year to make them shiny and leave residue on them so they can eat away at the pipe.

  13. #13
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,179
    99 percent of the time i just use water on outdoor unit

    yea maybe the amps on the fan dont change much , but the head pressure surely will with a dirty cond

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