80 RTHD-SVX01D-EN
Operating Principles Mechanical
When both solenoid valves are closed, the present level of compressor load-
ing is maintained.
On compressor shutdown, the unload solenoid valve is energized. Springs
assist in moving the slide valve to the fully-unloaded position, so the unit
always starts fully unloaded.
Oil Management System
Oil Separator
The oil separator consists of a vertical cylinder surrounding an exit passage-
way. Once oil is injected into the compressor rotors, it mixes with com-
pressed refrigerant vapor and is discharged directly into the oil separator. As
the refrigerant-and-oil mixture is discharged into the oil separator, the oil is
forced outward by centrifugal force, collects on the walls of the cylinder and
drains to the bottom of the oil separator cylinder. The accumulated oil then
drains out of the cylinder and collects in the oil sump located near the top and
in-between the evaporator and condenser shells.
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