Section 2
DESCRIPTION
5
2.1 INTRODUCTION
Your new Sullair flood-lubricated rotary screw air
compressor will provide you with a unique experi-
ence in improved reliability and greatly reduced
maintenance.
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 8 (Maintenance) to see how 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 Figure 2-1A or 2-1B. The components and
assemblies of the air compressor are clearly
shown. The complete package includes compres-
sor, electric motor, starter, compressor inlet system,
compressor discharge system, compressor lubrica-
tion and cooling system, capacity control system,
instrument panel, aftercooler, a combination sepa-
rator and trap, all mounted on a heavy gauge steel
frame.
On air-cooled models, a fan draws air over the
motor and forces it out through the combined after-
cooler and fluid cooler thereby removing the com-
pression heat from the compressed air and the
cooling fluid.
On water-cooled models, a shell and tube heat
exchanger is mounted on the compressor frame.
Fluid is piped into the heat exchanger where com-
pression 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 filters and
control valves. The inlet air filter is also easily
accessible for servicing.
2.3 SULLAIR COMPRESSOR UNIT, FUNCTIONAL
DESCRIPTION
Sullair air compressors feature the Sullair compres-
sor unit, a single-stage, positive displacement,
flood lubricated-type compressor. This unit provides
continuous compression to meet your needs.
Sullair 24KT compressors are filled with a long life
lubricant. In the event a change of fluid is required,
use only Sullair 24KT fluid.
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 between the rotors and the 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 2-2A, 2-2B, 2-3A, 2-3B and 2-3C.
The Cooling and Lubrication System (air-cooled
version) consists of a fan, fan motor, radiator-
type after-cooler/fluid cooler, full flow fluid fil-
ter, thermal valve, and interconnecting piping
and tubing.
For water-cooled models, two shell and tube heat
exchangers are substituted for the radiator-type
cooler listed above.
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-
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.
Standard thermal valve temperature is 175ºF
(79ºC). Thermal valve temperature is 190ºF (88ºC)
for HH, XH and 24KT machines.
Mixing, changing or adding other lubricants with-
in the compressor unit may void the air-end war-
ranty.
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