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50DF024 Unit had too much oil put in by someone that didn't know better. Compressor died of course. Burnout. I put in a reman comp (06E)and a suction line filter core with cleanout filter. After start up, ran smooth, some oil migrated back to crankcase. High oil level, drained a gallon, oil level barely 1/8 in sight glass. Ran unit for 2 wks, (14 hrs per weekday only)all ok. Changed a filter core again, upon start up, comp was shaking badly and drawing high current. Enough to trip breaker. Oil level in glass appeared ok. Only been looking in the glass on same side as power connections. Didn't check other glass. Removed heads, found oil in cylinders (2 tablespoons or so)and in the discharge port in the block near the discharge valve. Same both sides. It seems like I need to get trapped oil out of the system. Help! Thank you Jaime

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SOURCE: 5 ton goodman ac unit

You MUST WEIGH IN THE NEW CHARGE OF R-22. There should be a label on the side of the a/c unit that states what the factory charge was. This is only a starting point. Once you have the factory charge in the system, then turn on the unit and allow it to stabilize (5 min) . Check pressure on low side and check teperature on low side pipe. Temperature of pipe should be 8 to 15 degrees above what the boiling point of the refrigerant is for the current pressure you are reading. If the temperature is more than 15 degrees, add R-22 in 4oz increments allowing 5min in between each time you add until you are in the "zone". When you do this, your head pressure needs to be 225-250. if you need to cover the coil or block the outdoor fan to do this then do it. Hook up the vacuum pump and start over

Posted on Jun 18, 2008

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After approx 16 uses, I removed it from the window & stored in at the bottom of my closet. When I installed it the following summer, the unit wouldn't turn on. I checked the power etc, all fine. What...

Hi, all it said was after 16 uses you stored it in your closet. When you re-installed it the next summer, you were cut off? I bet you were going to say it didn't work. Let me ask you this, did you happen to lay it on its side for any time at all? If you set it on end or on its side for the winter, it will never run again. What happens is the oil in the compressor mixes with the freon and runs out of the compressor. When you install it, the compressor has no time at all for the oil to return to the crankcase and you have a burnout. If this is not the problem, could you write me back and explain what has happened for me so I will know what to do? I thank you for this. If I was right, then the unit is no good, and wouldn't be worth replacing the compressor compared to buying a new one. Please let me know.
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Hi, sounds as though for this to be its 2nd compressor for such a newer unit, the superheat was not right when the compressor was installed. I don't know what freon you are using the new R-410A or the regular R-22. There's a big difference in pressure, but now I see your pressure reading and its R-22 for these readings.For a 2 ton unit, you would use the superheat charging method for a unit that doesn't use a thermostatic expansion valve ( T X V ) and not the sub-cooling. A 23 degree super heat at that outdoor ambient temperature is way to high for that unit, you will loose the compressor again!!. Super heat killed the compressor is the saying and that's a fact. Suction pressure should pull down just as quick as the head pressure unless the valves are going and weak, or you have a scroll compressor that has a valve plate that is going, or you are low on charge. With a ambient of 95*, you should be at around 270p.s.i. on your head pressure as 210 to 200 is way low. Suction line temp should be around 68 to 70, with a suction line temperature of 50 to 51 degrees, which would give you a 10 to 12 degree F super heat. I don't know when the second compressor was installed, but it has to be low on charge to be such a low head, and high super heat and you will loose this compressor again, its only a matter of time before you have a burnout. It was either under charged when installed, or has a very small leak at one of the joints. I hope the liquid line drier was replaced also. It shows me you have some knowledge on a/c operation, so you need to get that superheat down to between 8 and 10 degrees for this unit to cool properly, and leak check it also. Did you buy a extended compressor warranty? Lets get the head pressure up and superheat down and you should be OK unless the valves or valve plate is weak. Once you loose the valves, you will have a lower than normal head pressure and a high suction pressure. Compressor just won't pull down anymore. I hope I have been of help to you and ask of you to be kind when rating me. I will be here for you if and when you need me for anything.
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Well I dont know what refrigerant your working wqith but I know the oil press sw's Ive dealt with open after a senmce of NO pressure Difference between Crank case and Oil pump Output pressure. You'll have to pump down the compressor and install an access tee for telling you what your oil pressure is and then subtract the suction pressure for true oil pressure. Usually the oil press sw is set at factory and is tween 7 and 20 psig. If it dosnt see this pressure a heater on the OP sw will energize and if the difference isnt senced withing the heater time limit it causes the points to open shutting off the compressor. If oil press is indeed low You could have bad oil, bad screen inlet to the pump or worn out pump or low oil. BEWARE LOW REFRIGERANT CAUSES OIL TO SETTLE OUT DURING A RUN CYCLE. So if you add some oil then Refrigerant Be ready to take the oil back out important to measure how much in so you dont take out too much. Low back pressure from anything from low charge to a TXV or other valve not feeding correctly. This pressure being low can allow oil to settle anywhere eccept tyhe crank case. The Refrigerant returning toi the compressor caries it back usually unless its piped in incorectly where the oil can trap OUT of the system and not be brought back. .

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Split Airconditioner

you can add oil to unit from suction valve but you have to know how much == you have to remove the cmopressor drain it of oil and add the countity that wrighten on it between 500 and 750 cc appro
as i understand your question when you know that the comp needs oil change
its when it is over heated or work at high temp
so you can hear a noise or an usual motor noise
i wish it ok

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