Compressors often burn out by overheating caused by above-normal head pressures. Laboratory tests have proven that presence of air, dirt, and moisture in the sealed…

When an overload protector cracks or gets weak, it loses its ability to transmit power long enough for the compressor to reach its initial speed.…

Motors draw up to 600% more current at the instant of starting. This increased starting current tends to overheat the start winding if the motor…

Motors draw up to 600% more current at the instant of starting. This increased starting current tends to overheat the start winding if the motor…

When the condenser gets linted or when the condenser fan becomes sluggish or totally inoperative, the head pressure (high-side pressure) goes up because the condenser…

A high-pressure control is wired in series with the compressor common terminal, and it is also connected to the discharge line. Its main function is…

If a starting relay does not disconnect the power from the compressor start winding, the compressor will keep running on its start winding until it…

Short-cycling means that a refrigeration unit starts and stops much more frequently than it should. The most common causes of compressor short-cycling are (1) a…

Since in this system the evaporator is always filled with liquid refrigerant, this is also considered a flooded system. During the run cycle, liquid refrigerant…

Although the technical schools and many refrigeration manuals refer to high- and low-side float systems, units using these systems are very seldom encountered. The low-side…