Question about Refrigerators
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Posted on Jan 02, 2017
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.
Posted on Aug 11, 2010
SOURCE: I replaced the compressor on
**** boy. 72 psi on the low side? It ain't an air conditioner. The low side should be never over 5 PSI. The whole system holds only arounf 4 ounces. What were ya thankin? LOL WOW you will be lucky if the reed valves ain't blown in the new compressor. Go ahead and evacuate the system. Pull that ****** down to as close to negative 30 as you can and then shut her down. Just crack open the freon a hair and let it SLOWL:Y build to no more than 5PSI on the low side.
Posted on Feb 17, 2011
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.
Posted on May 31, 2009
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