TM 5-4310-451-141-14. AIR COMPRESSOR ASSEMBLY (Con’t).(3)If less than the rated capacity of air is required, the service line pressure will rise above 100 psi (690 kPa). Thepressure regulating valve (16) gradually opens, applying pressure to the diaphragms on the sullicon control (13). Thiscauses the sullicon control to partially close the inlet valve (14) and reduce the speed of the engine (9). As the pressureincreases, the sullicon control will further close the inlet valve and continue reducing the engine speed until it reachesloaded speed. The sullicon control has an opening (15) in its cover which vents a small amount of air to the atmospherewhen the pressure regulating valve is open. This allows the sullicon control to vary air output matching air demand. Theopening also bleeds any accumulated moisture from the sullicon control. The air compressor assembly will continue to runin this manner until air demand increases. As air demand increases, pressure in the oil separator (1) will fall below 100 psi(690 kPa). The pressure regulating valve will close, the inlet valve will be fully open, and the engine will once again run atfull speed.(4)The blowdown valve (17) is held closed by a pressure signal from the air compressor (2). Upon shutdown, thepressure signal is lost and the blowdown valve opens venting oil separator pressure to the atmosphere.e.AirInletSystem.(1)The air inlet system consists of two air cleaners(19) and restriction indicators (18), an air inlet valve (14),and interconnecting piping to the engine (9) and aircompressor assembly.(2)The air inlet valve (14) controls the amount of airintake to the air compressor (2) in response to theoperation of the sullicon control (see subpara graph d).(3)The air cleaners (19) are three-stage dryelement type filters. These filters are capable of cleaningextremely dirty air; however, in such cases morefrequent checks of the restriction Indicators (18) will berequired. The restriction indicator will be red when re-striction of air passing through the air cleaner becomestoo high.f.Instrument Panel Group. The instrument panel group consists of a panel containing an engine coolanttemperature gage, engine oil pressure gage, air pressure gage, air compressor discharge temperature gage, ammeter,tach/hourmeter, ON/OFF engine switch, engine start button, override button, emergency stop control which is located onthe outside just below the instrument panel window, a cold start valve, fuse, and ether starting aid kit.g.Electrical System.(1)Refer to the wiring diagram in paragraph 4-61 for the location of major components of the electrical system.(2)The electrical system is comprised of not only the necessary equipment required to operate the air compressorunit, but also a system to shut down the air compressor unit in the event of a malfunction.(3)The components of the electrical system are:(a)Engine starter with an integral solenoid.(b)Two batteries.TA7046831-17
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