Compressor Cooling And Lubrication System, Functional Description - Sullair LS-120 series Operators Manual And Parts Lists

Section 2
DESCRIPTION
Figure 2-2 Sullair Rotary Screw Air Compressor- Water-cooled (Typical component layout)
compressor unit permitted in accordance with the
terms of the warranty.
Sullair 24KT compressors are filled with a fluid
which rarely needs to be changed. In the event a
change of fluid is required, use only Sullair 24KT
fluid.
Mixing of other lubricants within the compressor
unit will void all warranties
Sullair recommends that a 24KT sample be taken at
the first filter change and sent to the factory for
analysis. This is a free service. The sample kit with
instructions and self-addressed container is to be
supplied by your Sullair dealer at start-up. The user
will receive an analysis report with recommenda-
tions.
Fluid is injected into the compressor unit in large
quantities and mixes directly with the air as the
rotors turn, compressing the air. The fluid flow has
three basic functions:
1. As coolant, it controls the rise of air temperature
normally associated with the heat of compres-
sion.
2. Seals the clearances between the rotors and the
6
stator and also between the rotors themselves.
3. Acts as a lubricating film between the rotors
allowing one rotor to directly drive the other,
which is an idler.
After the air/fluid mixture is discharged from the
compressor unit, the fluid is separated from the air.
At this time, the air flows through an aftercooler and
separator then to your service line while the fluid is
being cooled in preparation for reinjection.
2.4 COMPRESSOR COOLING AND LUBRICATION
SYSTEM, FUNCTIONAL DESCRIPTION
Refer to Figures 2-3
Lubrication System (air-cooled version) consists
of a fan, fan
aftercooler/fluid cooler, full flow fluid filter, ther-
mal valve, and interconnecting piping and tub-
ing. For water-cooled models, two shell and tube
heat exchangers are substituted for the radiator-
type cooler listed above.
receiver/sump causes fluid flow by forcing the fluid
from the high pressure area of the sump to an area
of lower pressure in the compressor unit.
Fluid flows from the bottom of the receiver/sump to
the thermal valve. The thermal valve is fully open
when the fluid temperature is below 170°F (77°C)
and 2-4. The Cooling and
motor, radiator-type
The pressure in the