Question about LG LSC121PMA Split System Air Conditioner

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LG AC Split Compressor Condensers burn out ( malfunction). We have 11 units in the house, installed less than a year. Temperature in this year summer was extremely hot in Saudi Arabai, 50-55 Centigrades. We replaced 2 condensers ( capacitors). Technicians said because of the heat. I need a technical opinion on this issue. How to prevent it or at least decrease it?. How to prolong the life of the condensers? Regards, AIJ

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You can not put a life span on a capacitor but for your condenser/maintenance is the main thing to prolong life you your unit they must be cleaned and tuned up regularly

Posted on Sep 29, 2010

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Posted on Jan 02, 2017

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How much more efficent is this than my 40 yr old janitrol 125000 btu beast


not knowing what you are replacing it with, it is hard to give a reasonable answer ( old sealed units against split system converter ac units )
However if you work along these lines, you will come to a logical decision
First off the old machines had the compressor operation tied to the thermostat setting so the compressor ran full blast until the room cooled to the set temperature. Then it stopped and remain stopped until the room heated up. At this point the compressor restarted and that is the point the the most power is consumed
again it runs full blast until the room again cools and switches off
So you can see that you have a varying room temperature and high energy consumption on start up
Now compare that to inverter units
The compressor is running all the time ( no high energy start ups every 10 minutes or so) but the compressor becomes less efficient as the room cools down
Still running at full rpms but the controls reduce the compressing action--less power to run the compressor--so there is a reduction in power used
The temperature variation is reduced because as the room warms a bit the compressor pumps a bit more gas and doesn't start at full load as per the old unit
Next , the latest units have better temperature / humidity recognition controls so they can be set at night so a room maintains an ambient temperature /humidity so that as the night gets cooler and the air drier you don't wake up freezing
It will even get to the point where you wonder if the unit is working
Lastly you can run the unit at a much higher setting ( 27 Degrees c instead of 24 or less and have the same comfort level as at 24-25 degrees c)
lastly warranty is for 2 years at best and parts will be available for the next 10 years against parts for your old unit

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1 Answer

My LG Split 1 ton Continue poor working with under voltage 180V (Due to Long distance Transformer), Once its capacitor have to change this summer. Now i arrange Stabilizer which give 230V. Before...


Unfortunately, there is not a great deal of information about LG splits available, but is you are talking $12,000 to to repair, then it is much cheaper to replace since a two ton complete is less that half that amount.

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1 Answer

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Hello

Sounds like the compressor is shuting down on high heat.There could be a couple reasons for this.
1 Check that proper voltage is being supplied to compressor.
2 Freon level may be low.This would be a service call.
3 Bad or intermitent connection at thermostat.
4 Main contacts to compressor sticking,usually burnt or pitted.

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1 Answer

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Hello
First the foam insulation is not just for looks,you will have some loss of cooling on the unit,the larger cooper line needs to be insulated,the small one does not.The large line is the suction line,the small one the liquid line.
Voltage,168 is low,sounds like a 208 volt unit or 220 volt.running at 168 or 198 ac volts is going to raise the amperage causing the compressor to run hot and work harder and soon burn up,And cause it to trip the breaker or shut itsself down on high heat.Your going to need to get that voltage fixed.I dont know why it needs a stabilizer if the unit was sized correctly it shouldnt need one.
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1 Answer

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1 Answer

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It sounds like you are low on refridgerant. Double check to make sure both fans and the compressor are running. If so then you have a refridgerant problem.

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1 Answer

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When 13+ SEER condensers are replaced without installing a inside coil with an expansion valve the compressor in the new unit will slug and go bad. Slug means that liquid refrigerant returns to the compressor. Liquid can not be compressed so it causes the compressor to fail.

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1 Answer

LG S36AHP-UD7 Split Air Con. won't turn on.


Generally when an ac trips the main breaker and the breaker its self isn't bad, the compressor is going bad or is bad. To check you will need to do an ohms test on the compressor. If you get a reading of less than infinite, then the compressor is bad. You will need to test every lead going to the compressor which is usually 3 unless you have a crank house heater installed but they are not typical on a small unit. If the compressor has gone bad it is possible the it took the board out as well.

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1 Answer

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Hello Hamid,
The unit is designed to run the indoor fanmotors continuously when in cooling mode on both indoor units (evaporators). The reason is that this circulates the air and the temperature thermistor or sensor is able to sense return air temperature and in turn start or stop the outdoor unit and compressor as required according to the setpoint temperature. The reason for either unit not reaching setpoint temperature can be a couple of reasons. A) Incorrect design - the unit may be too small for the application. You can calculate this roughly at 650BTU per square meter of room in a relatively warm ambient climate. Or secondly B) The outdoor unit has leaked and is short of refrigerant. You can check this when the outdoor unit is running by feeling the thicker copper tube on the right hand side of the unit. This should be cool to cold. If no temperature difference is felt, it is short of refrigerant. Hope this helps you. Goodbye

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1 Answer

AC WILL NOT SHUT OFF


SOUNDS LIKE THE T-STAT TEMPERATURE SENSING BULB IS OUT OF "AIR-FLOW" (SOME CAN COME LOOSE FROM THEIR MOUNTING CLIPS) OR IT IS BAD ALL TOGETHER ... MOST MANUFACTURERS HAVE A ONE-YEAR WARRANTY ON SMALL PARTS AND 5 YEARS ON THE COMPRESSOR .., HOPE IT HELPED.

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