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  1. #1
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    LG ac charging problem



    hi
    i have lg ac cool only with low ambient temp connecting comp dis. to evaporater inlet by 2 capillary tube
    its compressor is burned
    so i replaced it with new one
    but whle charging with ***** and pressure reaching 50 psi and 12 amp current and suction line start cooling suddenly the pressure reaches 90 psi and current is 25 amp
    some expert advice me to remove the low temp selonid valve sensor and without result
    then i removed the solonid valve and its capillary so pressure stabled at 55 psi and 25 amp
    then i connect aditional one capillary tube between the filter dryer and evaporater now
    so capillary tube number been 3
    pressure stabled at 55 with weak ref effect
    and current is 15 amp.
    where is problem



  2. #2
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    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: LG ac charging problem

    Problem is that you no longer have a purely LG unit, you have modified it and it is no longer at the design specification.
    Brian - Newton Abbot, Devon, UK
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  3. #3
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    Re: LG ac charging problem

    i didnt made a modifying to design
    firstly i replaced the damaged compressor with new one with same LRA

  4. #4
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    Re: LG ac charging problem

    Quote Originally Posted by kefah View Post
    i didnt made a modifying to design
    firstly i replaced the damaged compressor with new one with same LRA


    See your first post....
    some expert advice me to remove the low temp selonid valve sensor and without result
    then i removed the solonid valve and its capillary so pressure stabled at 55 psi and 25 amp
    then i connect aditional one capillary tube between the filter dryer and evaporater now
    so capillary tube number been 3
    Brian - Newton Abbot, Devon, UK
    Retired March 2015
    Please support http://the100project.net/Home

  5. #5
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    Re: LG ac charging problem

    sorry you didnt understand me
    i mean before i made modification to capillary and solnid valve the problem is happened
    since the prob occurred after replacing compressor directly

  6. #6
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    Re: LG ac charging problem

    LRA is not the correct way to match compressor duty.
    Mostly found in Oxfordshire, UK :)

  7. #7
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    Re: LG ac charging problem

    so how to match compressor duty

  8. #8
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    Quote Originally Posted by kefah View Post
    so how to match compressor duty
    Apart from the obvious way of ordering a direct replacement from the manufacturer of the kit (LG) the only other way would be to compare motor loads and capacity graphs.

  9. #9
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    Re: LG ac charging problem

    compare motor loads and capacity graphs
    can u explain more

  10. #10
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    Re: LG ac charging problem

    First,
    You do know that LRA stands for "Locked Rotor Amperage" i.e. this is the current the motor might pull after it seized but before the windings melt?
    (Absolutely useless when selecting a compressor but vital when you size up cables and control gear feeding it)

    One indication of the capacity of a compressor is it's rated horsepower but that is only an indication.

    To correctly size a replacement if a direct replacement not is available you will have to look at the volume and displacement as well as performance charts/graphs/tables for the compressors.
    There you will find their rated duties for varying running conditions/temperatures and refrigerants.

    Have a look under [Performance Data] in THIS DOCUMENT and you will get an idea of what I'm talking about.



    .

  11. #11
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    Re: LG ac charging problem

    thank you man you realy helped me
    so if i chose the properly compressor
    then should i reweld the the patrs i removed before and return them to original places
    i mean capillary . selinoid valves

  12. #12
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    Re: LG ac charging problem

    please close the thread

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