depending on suction or crankcase pressure. Figure 5-3
The high-pressure oil from the pump enters
shows the compressor at rest. The two cylinders
chamber A of the capacity control valve. It then passes
equipped with the unloader element are unloaded and
through an orifice in the top of the piston to chamber B,
will remain unloaded until the compressor is started and
forcing the piston to the end of its stroke against spring
the oil pressure reaches normal operating pressure.
A. When the piston of the valve is forced against spring
Figure 5-3.Capacity control system.