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The suction line temp is 90 to 95 and drops down to about 68 on a residential unit checked the evap. it wasn't dirty flushed drain line wanted to know what could possibly be causing such a thing

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Check the Liquid line drier. Make sure the temperature on either side of the drier is the SAME.
If there is no drier, and there is an expansion valve installed in the air handler, then it might be "hunting" or have some trash or non-condensibles in the lines. The Liquid line must be in the low to mid 200psi range. Is the condensor coil clean? It must be.
Also is the filter new and not too restirctive? Don't use one of those 3 month filters. Think about this, if it is so good, and lasts 3 months, then each month, it gets loaded more and more. Imagine the particulates collected over a 3 month period!
Hope this helps.
God Bless.
Erik

Posted on Aug 08, 2008

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Why is suction and discharge lines of Goodman WMC24-1A split ac system freezing up.?


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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.
Sincerely,
Shastalaker7
A/C & Heating Contractor

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What happens when the pipe freezes?


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high side line is the small copper line
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a feedback would be good if this helps anyone...

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