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How do you check to see if the high side is leaking back into the low side on a scroll compressor suction pressure is 90psi R-22 suction line is warm but not hot

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Hi,
If you are running that unit with a scroll compressor and a high load then 90 is not that high and you probably are just low on charge...if you were leaking or crossing over the pressure would be much higher then that...
The only other possibilty would be that you are way over charged, but then you should be hearing a rattle in the compressoras the liquid would be running through it...

heatman101

Posted on May 06, 2010

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Which line is the low side on my chest freezer ?


Ok, basic refrigeration here. The 'high side' contains the high pressure vapor leaving the compressor and going to the condensor to condense into a high pressure liquid. The 'low side' contains low pressure refrigerant vapor within the evaporator and the suction line back to the compressor. The same amount of vapor has to return to the compressor as left the compressor. So thinking about pressure solves the problem....High pressure equals small line...
Low pressure equals larger line. The low pressure vapor will fill a larger space than high pressure vapor so it has to travel in a larger line. The suction side is the bigger of the two and if the unit is functioning, it will be the one cooler to the touch.

Though this is basically correct in theory, it is not a totally perfect way to descsribe an answer to your question, but it was fun to try.

Jul 03, 2014 | GE Freezers

1 Answer

Goodman unit runs and at the a-coil there is a piston where your suction and liquid lines connect. On the liquid side the piston is cold but warm on the other side of piston. A/C unit will not cool.


That piston is the metering device. On the liquid line, before the metering device it is always warm (this is sub cooled, high pressure liquid), but should flash to low pressure, lower temperature vapor once it passes through the metering device. The suction and liquid line never connect together.The liquid line brings liquid from the condenser to the evaporator. The suction line brings super heated vapor from the evaporator to the compressor. Since the unit does run, I'd have to put a gauge on it,but if I had to guess, I'd guess you have high head pressure. Check for dirt or debris on the condenser, check for proper clearance of the condensing unit and check for operation and directional rotation of the condenser fan. This could also be the result of an over charge.

Aug 26, 2013 | Goodman CKL36AR36 Air Conditioner

1 Answer

I have a 10 seer scroll unit the suction line is warm and compressor is hot but will not let me charge r-22 in the unit whats the problem


Your suction line should not be room temperature if your compressor is running unless there is a shortage of refrigerant. Check your pressures what do you get with the unit off (psi)? If pressures are fine and your compressor is getting hot it could be your capacitor for your compressor is bad. IF u have already changed the capacitor and your contacts to and on the compressor are fine and electricity to the unit is fine then your compressor needs to be changed

Aug 14, 2011 | Heating & Cooling

1 Answer

Temp off air coming out of register 74 degrees suction line temp is 42 degrees but high side line isnt warm dont look like it is wanting to take freon either compressor is running new system low side is...


Hello, what is your high side pressure? A bad compressor will show abnormally high low side pressure with abnormally low high side pressure. That 45 low side pressure is low And superheat high. If you high side pressure is normal toma little above normal but the low side remains low you have a restriction in the system, that might be why it's not taking in tne freon. Let me know you high side pressure

May 11, 2011 | Goodman Heating & Cooling

2 Answers

UNIT IS ONLY 4 YEARS OLD AND IS ON ITS SECOND COMPRESSOR SUCTION PRESSURE SLOW ABOUT GOING DOWN AND DISCHARGE PRESSURE GOES TO 210 THEN WILL DROP TO 200 .UNIT HAS 10 DEGREES SUBCOOLING BUT SUPERHEAT IS...


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

Jul 02, 2010 | Weather King 10AJA6001AH Air Conditioner

2 Answers

Air not cold enough to cool house


Make sure the outside fan is running. Also check the high side pressure, I assume the 70# is the low side pressure, so you can tell what the compressor is doing. If the fan and compressor are both working, make sure there is good airflow through outdoor coil and check that it is clean. Let me know what you find.

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1 Answer

How do you check to see if the high side is leaking back into the low side on a scroll compressor suction pressure is 90psi R-22 suction line is warm but not hot


90 psi is very high for R22....low for R410 refrigerant. If leaking by the head pressure and suction pressure will be close to to the same reading

May 10, 2010 | Heating & Cooling

1 Answer

Problem, unit turns on fine. no cold air coming out. soliniode clicks on and off in the outside unit. maby low colent in unit. what is proper pressure for high side and low side for the R-22 so i can...


it sounds like your low pressure switch is cycling the unit on and off, TURN IT OFF! The compressor is cooled by the suction gases returning to it, if you continue to run it this way you could kill your compressor! the pressures will vary depending on the conditions, (a quick check is: almost always the big copper line leading to the unit should be cold and dripping water with the unit on).

Jul 10, 2009 | Heating & Cooling

1 Answer

I cannot differentiate between the low pressure and high pressure


This is a little A/C 101. Follow the A/C lines. All A/C systems have a high pressure side and a low pressure side. The high pressure side is from the compressor to the condenser coil on the front of the vehicle to the evaporator coil in the dash. At the expansion valve in the evaporator the pressure drops. At the expansion valve the refrigerant changes from a liquid to a gas. This provides the cooling. The low pressure side is from the evaporator back to the compressor. Usually the high pressure lines are smaller than the low pressure (suction) lines.

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