Most mechanical failures are caused by liquid stroke, system moisture, impurity or contamination, and low oil level.
Liquid Stroke: The compressor compresses liquid due to poorly sized system, causing poor performance, breaking the suction valve or locking (use liquid separator).
Moisture in the System: Moisture is mixed with the refrigerant forming acids that attack all metal surfaces (valve plate, shaft, etc.), removing the insulation layer of the electric motor, and can freeze the capillary outlet; over time the engine will burn (use a vacuum pump with a vacuum gauge).
Impurities: resulting from copper burrs, welding without nitrogen, dirty tubing, mainly in a system that burned the compressor and was not cleaned properly and did not change the dryer filter. These irregularities cause low performance, noise, blockage or even the engine burns.
Contamination: Methyl alcohol or any antifreeze is extremely damaging to the refrigeration system. The filter drier retains more alcohol than water. The alcohol remains trapped in the desiccant of the filter, and the water continues to circulate and wreak havoc on the system, corroding the metal parts and burning the engine.
Low Oil Level: due to poorly sized system in which the oil did not return to the compressor, causing noise and blocking of internal parts (use oil separator).
