SECTION 2
®SULLAIR®
8
3700 Operator’s Manual and Parts List
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, microprocessor controller, aftercooler, a
combination 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
compression 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
accessible for servicing.
2.3 SULLAIR COMPRESSOR UNIT,
FUNCTIONAL DESCRIPTION
Sullair air compressors feature the Sullair compressor
unit, a single-stage, positive displacement, flood
lubricated-type compressor. This unit provides
continuous compression to meet your needs.
The 3700 Series compressors are factory-filled with
Sullube lubricant. For more information on fluid fill,
consult Section 3, SPECIFICATIONS.
Sullair 24KT compressors are filled with a fluid that
rarely needs to be changed. Use only Sullair 24KT fluid
in the event that a fluid change is required.
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 recommendations.
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:
1. As coolant, it controls the rise of air temperature
normally associated with the heat of compression.
2. Seals the clearance paths 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.
NOTE
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.
SU_0000021
CAUTION
Mixing of other lubricants within the
compressor unit will void all warranties.
SU-0000022
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