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4.1 INTRODUCTION
Your new Sullair flood-lubricated rotary screw air
compressor will provide you with improved reliability
and greatly reduced maintenance.
Compared with 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 keep your com-
pressor in top operating condition. Should any ques-
tions arise which cannot be answered in the follow-
ing text, call your nearest Sullair office or the Sullair
Corporation Service Department.
4.2 DESCRIPTION OF COMPONENTS
Refer to Figure 4-1. The components and assem-
blies of the ES-8 Series air compressor are clearly
shown. The complete compressor consists of an
encapsulated compressor system, inlet sys-
tem, cooling system, control system and super-
visor control system.
The compact design of the ES-8 Series air compres-
sor provides easy access to all serviceable compo-
nents.
4.3 ENCAPSULATED
FUNCTIONAL DESCRIPTION
Refer to Figure 4-2. The encapsulated compressor
includes compressor unit, fluid management
system, and drive motor. The Sullair compressor
unit is a single-stage positive displacement lubri-
cated type compressor. This unit is equipped with
tapered roller bearings on the discharge and cylin-
drical roller bearings on the inlet end for high load
carrying capacity. This unit provides continuous
pulse-free air compression to meet your needs.
With a Sullair compressor there will be no mainte-
nance or internal inspection of the compressor.
!
DO NOT remove caps, plugs and/or other compo-
nents when compressor is running or pressur-
ized.
Stop compressor and relieve all internal pressure
before doing so.
Fluid is injected into the compressor unit in large
quantities and mixes directly with the air as the ro-
tors turn, compressing the air. The fluid flow has
three main functions:
1. As coolant, it controls the rise of air temperature
normally associated with the heat of compres-
sion.
2. It seals the leakage paths between the rotors and
the stator and also between the rotors them-
selves.
3. It acts as a lubricating film between the rotors al-
lowing one rotor to directly drive the other, which
is an idler.
COMPRESSOR
SYSTEM,
WARNING
COMPRESSOR SYSTEMS
The air/fluid mixture discharges directly into the fluid
management system.
The fluid cooler bypass valve helps assure proper
cooling by directing the fluid to the fluid cooler when
discharge temperature reaches the thermostat tem-
perature setting.
During start-up in cool ambient conditions, the cool-
er pressure drop may cause the filter bypass valve
to open up, assuring adequate fluid supply to the
compressor.
All fluid entering the compressor unit passes
through the replaceable fluid filter element. This re-
placeable filter element contains a built-in bypass
valve. Under conditions of restricted flow through
the element, the bypass valve helps ensure ade-
quate compressor fluid flow, as well as helps pre-
vent element failure.
FLUID MANAGEMENT SYSTEM
The Fluid Management System consists of a multi-
chambered primary/secondary separator, the final
air/fluid separator element, cooler bypass and fluid
filter.
As compressed air/fluid enters the sump, the first
fluid separation takes place due to a reduction of
flow speed coupled with a change of direction of the
flow within the sump housing. The compressed air
reaches the separator and the finest fluid drops and
mist are separated.
The minimum pressure/discharge check valve is
mounted on the compressor drive housing. Its func-
tions are as follows:
1. Maintains a minimum sump pressure of 60 psig
(4.2 bar) under full load operation to help assure
adequate fluid pressure.
2. Acts as a check valve to isolate the compressor
from the system at shutdown or unload.
DRIVE MOTOR
The Drive Motor consists of a squirrel cage induc-
tion motor which is connected to the integrated drive
gearing by a drive coupling.
4.4 COMPRESSOR COOLING SYSTEM, FUNC-
TIONAL DESCRIPTION
The Compressor Cooling System consists of a fluid
cooler, fan and cooler shroud.
The fan is mounted on the compressor shaft. Air is
drawn through the motor adaptor by the fan and ex-
its through the coolers on top of the compressor.
The air provides cooling for compressor fluid and
cooling of air on units with air aftercoolers.
4.5 AIR
INLET
SYSTEM,
SCRIPTION
The compressor inlet system consists of a dry-type
air filter and an air control valve. Reacting on a pres-
sure signal, the valve closes the intake for unloaded
operation. The valve also acts as a check valve
upon shutdown.
Section 4
FUNCTIONAL
DE-
13
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