It provides pressurized MIL-L 23699 oil for lubrication and control. To engage the compressor, a 28 volt signal opens a solenoid valve permitting lube oil flow into the fluid coupling, allowing the compressor to be driven by the gear box. Upon depressing the engage push button, the fluid coupling has 15 seconds to fill and bring the compressor to required discharge pressure. While engaged, a continuous flow of oil passes through the fluid coupling to dissipate heat. De-energizing the solenoid valve disengages the compressor by securing oil flow to the coupling.
Oil remaining within the coupling drains back into the oil sump.
Filling or draining the fluid coupling requires approximately 15 seconds. The ACC provides remote control for the SAC operation. Regardless of the operating station, the minimum cycle times for the SAC are three minutes engaged and three minutes disengaged to allow for proper heating and cooling of the lube oil.