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 PRINCIPLES OF OPERATION In addition to supplying oil pressure to the compressor lubrication system, the compressor oil pump also provides oil pressure to operate the compressor capacity control system, which is controlled automatically. Loading the cylinders one by one as required, increase compressor capacity. Similarly, unloading one or more cylinders, as and when required, can reduce the compressor capacity. Externally mounted solenoid valves, controlled by a signal from a remote device provide reliable response to system load. During energized condition of the solenoid valve APS-1, oil flows to unloader power element to load the compressor. During the de-energized state, oil backed up in unloader power element flows back to oil sump and compressor gets unloaded. Thus, solenoid valve type APS-1 is energized to load the compressor and de-energized to unload the compressor.  |
