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  1. #1
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    compressor ratings in horse power


    what is the relationship between motor power and pump power in a compressors. say how do you know a compressor power when you have motor power in watts. For example you have a compressor with name plate reading 220V 32A LRA. how can you make use of this to know how many horse power is a compressor



  2. #2
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    Re: compressor ratings in horse power

    watts = voltage x amps
    horsepower is K-watts divided by 0.75
    Last edited by paul_h; 28-03-2008 at 08:08 AM. Reason: kilowatts, not watts

  3. #3
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    Re: compressor ratings in horse power

    LRA = locked rotor amps which is nothing to do with the motor power or refrigerating effect of the pump.

    You need to refer to the compressor manufacturers' data sheet for the compressor model for duty ratings etc.
    Brian - Torquay, Devon, UK
    I have to stop saying "how stupid can you be?" to my co-workers.
    They're starting to take it as a challenge...

    BASIC MAINTENANCE. If it doesn't move and it should then use WD40. If it moves but it shouldn't then use Duct Tape.

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    Re: compressor ratings in horse power

    Quote Originally Posted by Brian_UK View Post
    LRA = locked rotor amps which is nothing to do with the motor power or refrigerating effect of the pump.

    You need to refer to the compressor manufacturers' data sheet for the compressor model for duty ratings etc.
    You're right, for some reason I was thinking of FLA. My mind was wandering because I was trying to sort out the fan for the fedders split unit when I replied.

  5. #5
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    Re: compressor ratings in horse power

    Quite understandable Paul, we only have so many brain cells in use at one time.

    Well, that's what I'm told by the wife
    Brian - Torquay, Devon, UK
    I have to stop saying "how stupid can you be?" to my co-workers.
    They're starting to take it as a challenge...

    BASIC MAINTENANCE. If it doesn't move and it should then use WD40. If it moves but it shouldn't then use Duct Tape.

  6. #6
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    Re: compressor ratings in horse power

    The compressor rating can be assessed on based on the refrigerant, Evap. Temp. and the Cond. Temp. Based on the rating the electrical load kw could be found from the compressor rating chart.

  7. #7
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    Re: compressor ratings in horse power

    Quote Originally Posted by themba View Post
    what is the relationship between motor power and pump power in a compressors. say how do you know a compressor power when you have motor power in watts. For example you have a compressor with name plate reading 220V 32A LRA. how can you make use of this to know how many horse power is a compressor
    Compressor dose not have a any hose power. Motor dose.
    You can connect on same compressor at one condition 50 hp and other 100 hp. All depend on evap temp condensing temp etc... If really you want know how much hose power using on the motor you need hook up meters.

    tedre

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