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2.1 INTRODUCTION
Your new Sullair lubricated rotary screw air com-
pressor will provide you with a unique experience in
improved reliability and greatly reduced mainte-
nance.
Compared to other types of compressors, the
Sullair rotary screw is unique in mechanical reliabil-
ity, with "no wear" and "no inspection" required of
the working parts within the compressor unit.
Read Section 7 (Maintenance) to see how surpris-
ingly easy it is to keep your air compressor in top
operating condition. Should any questions arise
which cannot be answered in the following text, call
your nearest Sullair representative or the Sullair
Corporation Service Department.
2.2 DESCRIPTION OF COMPONENTS
Refer to Figures
2-1A
and assemblies of the air compressor are clearly
shown. The complete package includes compres-
sor, electric motor, compressor inlet system,
compressor discharge system, compressor
cooling and lubrication system, capacity con-
trol system and "Supervisor Controller System"
all mounted on a structural steel frame.
On air-cooled models, the cooling package is
mounted within the package. The separate motor-
driven fan cooling package forces air through the
coolers, which removes the heat of compression
from the cooling fluid.
Both air-cooled and water-cooled versions have
easily accessible items such as the fluid filters and
control valves. The inlet air filters are also mounted
for easy access and servicing.
2.3 SULLAIR COMPRESSOR UNIT, FUNCTIONAL
DESCRIPTION
Sullair air compressors feature the Sullair compres-
sor unit, a two-stage, positive displacement, lubri-
cated-type compressor. This unit provides continu-
ous pulse-free air compression to meet your needs.
With a Sullair compressor, there is no maintenance
or inspection of the internal parts of the compressor
unit permitted in accordance with the terms of the
warranty.
Fluid is injected into the compressor unit at each
stage, and mixes directly with the air as the rotors
turn, compressing the air. The fluid flow has three
main functions:
• As coolant, it controls the rise of air temper-
ature normally associated with the heat of
compression.
• Seals the leakage paths between the rotors
and 2-1B. The components
and the stator and also between the rotors
themselves.
• 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 to the service line and the
fluid is cooled in preparation for reinjection.
2.4 COMPRESSOR COOLING AND LUBRICATION
SYSTEM, FUNCTIONAL DESCRIPTION
Refer to Figure 2-2, and Sections 9.28,
9.30
in the Parts List portion of this manual. The
cooling and lubrication system consists of a fluid
cooler, aftercooler, full flow fluid filters, fluid stop
valve, thermal valve and interconnection piping. For
water-cooled models, a shell and tube fluid cooler
and aftercooler are mounted on the compressor
package. For air-cooled models, they are radiator-
type coolers, and are mounted on the compressor
package.
The pressure in the 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 com-
pressor unit.
Fluid flows from the bottom of the receiver/sump to
the thermal valve. The thermal valve is fully open
when the discharge temperature is below 220ºF
(104.4ºC). The fluid passes through the thermal
valve, the main fluid filter and directly to the com-
pressor unit, thus feeding the bearings, seals and
rotor area.
As the discharge temperature rises above 220ºF
(104.4ºC), due to the heat of compression, the ther-
mal valve begins to close and a portion of the fluid
then flows through the cooler. From the cooler, the
fluid flows to the main filter and on to the compres-
sor unit. The fluid filter has a replacement element
and an integral pressure bypass valve.
The fluid stop valve prevents fluid from filling the
compressor unit when the compressor is shut
down. When the compressor is operating, the fluid
stop valve is held open by air pressure from the
compressor unit allowing a free flow of fluid from the
receiver/sump back to the compressor unit. On
shutdown, the compressor unit pressure is reduced,
causing the fluid stop valve to close and isolate the
compressor unit from the cooling system.
2.5 COMPRESSOR DISCHARGE SYSTEM, FUNC-
TIONAL DESCRIPTION
Refer to Figure 2-2, and Sections 9.28,
Section 2
DESCRIPTION
9.29
9.29
and
and
5
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