Section 2
SN55, SN55S, SN55V, SN75, SN75S, SN75V User Manual
2: Description
02250247-571 R04
Subject to EAR, ECCN EAR99 and related export control restrictions.
14
Description
2.1
Introduction
Your new Sullair flood-lubricated rotary screw air com-
pressor will provide you with a unique experience in
improved reliability and simplified maintenance. Com-
pared to other types of compressors, the Sullair rotary
screw is unique in mechanical reliability, with “No Wear”
and “No Inspection” required of the working parts within
the compressor unit. Read
Section 6: Maintenance
on
page 70 to see how surprisingly easy it is to keep your air
compressor in top operating condition.
2.2
Description of components
Refer to
Figure 2-1
and
Figure 2-2
. The components and
assemblies of the air compressor are clearly shown. The
complete package includes compressor, electric motor,
starter, compressor inlet system, compressor discharge
system, compressor lubrication and cooling system,
capacity control system, controller, aftercooler, a combi-
nation separator and trap, all mounted on a heavy gauge
steel frame.
On air-cooled models, a fan draws air into the enclosure
over the fan and main motors through the combined
aftercooler and fluid cooler thereby removing the com-
pression heat from the compressed air and the cooling
fluid, and forces it out the top of the machine.
On water-cooled models, a shell and tube heat
exchanger is mounted on the compressor frame. Fluid is
piped into the heat exchanger where compression heat is
removed from the fluid. Another similar heat exchanger
cools the compressed air.
Both air-cooled and water-cooled versions have easily
accessible items such as the fluid filter air/oil separator
and control valves. The inlet air filter is also easily acces-
sible for servicing.
2.3
Sullair compressor unit,
functional description
Sullair air compressors feature the Sullair compressor
unit, a single-stage, positive displacement, flood lubri-
cated- type compressor. This unit provides continuous
compression to meet your needs.
Sullair compressors are factory-filled with Sullube
®
lubri-
cant. For more information on fluid fill, consult
Section
3.7: Lubrication change recommendations and mainte-
nance, fluid
on page 25.
Fluid is injected into the compressor unit hoses and
mixes directly with the air as the rotors turn, compressing
the air. The fluid flow has three basic functions:
• As coolant, it controls the rise of air temperature nor-
mally associated with the heat of compression.
• Seals the clearance paths between the rotors and
the stator and also between the rotors themselves.
• Acts as a lubricating film between the rotors allow-
ing one rotor to directly drive the other, which is an
idler.
After the air/fluid mixture is discharged from the compres-
sor 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 prepa-
ration for reinjection.
NOTE
With a Sullair compressor, there is no mainte-
nance or inspection of the internal parts of the
compressor unit permitted in accordance with
the terms of the warranty.
WARRANTY NOTICE
Mixing of other lubricants within the compressor
unit will void all warranties.
