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Refrigerator what should the low side refrigerant pressure be on a refrigerator while it is running

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0 to 3 pounds is normal. Much higher than 3 pounds would most likely be a weak compressor. A vaccum would indicate out of freon/leak or a restriction.

Posted on Jul 14, 2008

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Why wont my Tr1RRI-1S cool?


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If your running 134 a your short of gas
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Not cooling, compressor is running but both lines are warm. fan is running also.


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What is the high and low side pressures on the 134A compressor of my amana side by side refrigerator / freezer?


Good day,
The low side (suction pressure) is pretty nominal at 2 to 4 lbs.
The high side should range from 120 to about 14 lbs. depending on load and ambient temperature.
This would be after 15 minutes running time. Doors closed. Rear panel on as well as can be attached with gauge hoses protruding.

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3 Answers

Want to know operating pressures on a 134a refrigerator low and high


Maximum efficiency is achieved when there is the greatest difference between high side and low side provided the low side stays under 30 psi or so. The low side pressures must stay low enough to cause the refrigerant to change states in the evaporator. If you see frost on the compressor suction line, there's too much refrigerant, and you'll overload the compressor. The correct approach, if you have the equipment and it sounds like you must have a gauge set but you need recovery to do this right, is to evacuate the sealed system, (a tight system will hold a vacuum overnight, but an hour is a good test if you suspect any leaks) and refill with the exact amount of refrigerant (by weight) as indicated on the ID tag.. Any system that will not perform when filled to that specification has either a bad valve in the compressor, or a restriction caused by contamination. Contamination is usually from moisture (humidity) introduced into the system by improper servicing, but is usually relieved if the system is under vacuum long enough to boil out the moisture. If the compressor is the culprit, it's usually game-over.

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