Anonymous Posted on May 20, 2009

Operating pressures for 134A refrigerant system

What are the normal high side and low side pressures for an average domestic refrigerator using R 134A refrigerant that is working as it should?

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J Rosado

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Posted on Apr 26, 2015

J Rosado

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I would go for 40 on the suction and 150 discharge, or divide the locked rotor current by 6 and charge so the current is 1/6 of the locked rotor current of the compressor, or by temperature/pressure relation 110* discharge and 35* suction, or get the suction line sweating. The best way is to remove all the refrigerant and then weigh the refrigerant the system is designed for on these critical charge appliances.

Omar Hernandez Oct 21, 2019

https://www.6ya.com/technicalsupport https://www.6ya.com/technicalsupport

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Anonymous

585 Answers
Posted on May 31, 2009

SOURCE: 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.

Gil Shultz

3464 Answers
Posted on Dec 02, 2009

SOURCE: whats the working pressure of R134a in refrigerator

That question does not have a simple answer. The pressure is directly related to the temperature. You can go on line and get a table showing the pressure vs temperature. I would think 0 is a good starting point for the return temperature. High is also related to temperature. I would expect the high to be about 135 but that depend on ambient etc. You may have to have a licence to tap the refrigeration system and purchase gas depending on your locaton.
Good Luck,
Gilshultz

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