The type of compressor is irrelevant. They all perform the same function - moving the refrigerant. Gauge readings are important. High side as well as low side. Under average conditions on a rather warm day, and depending on the refrigerant used, the high side should run about 250 to 350 with R-134a. Low side should run between 25 and 45. Note that these are APPROXIMATE numbers. Under or over charge will affect them. Ambient temperature will also affect them. Now, having said all of that, if your gauge readings seem to be in the right range, it would point to an expansion valve. Most non-cycling systems use an expansion valve rather than a fixed (or variable) orifice. Some cycling systems also use an expansion valve. It is up to you to determine which you have. Now, the things that will affect cooling capacity of the unit: 1) Over or under charge. Be sure that you have the right amount of refrigerant in the system. 2) Air in the system. Air is a non-condensable gas. This means that it will NOT change state from gas to liquid and back to gas within the operating parameters of a refrigeration system designed for R-134a or R-12. 3) Too much OIL in the system. The opposite of air, but with the same effect. Too much oil will displace the refrigerant, and will prevent the proper changing of state of the refrigerant from liquid to gas and back to liquid.
Surprisingly, these systems are very simple yet difficult for many to understand. The basic principle of refrigeration is that a liquid refrigerant is sprayed through a metering device into a coil called an evaporator. The change of state from a liquid to a gas absorbs a tremendous amount of HEAT from the interior of what you are cooling. The entire system is designed to provide that liquid to the evaporator for cooling to take place. This means that after the liquid has evaporated, it needs to be returned to a liquid again for continued cooling. The system is designed to do that in a closed environment. In your case, this is not happening. The causes I have listed are the major causes of a no cooling problem. Good luck, and I hope this is of some help.
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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