Section 2
DESCRIPTION
5
2.1 INTRODUCTION
Your new Sullair flood-lubricated rotary screw air
compressor will provide you with improved reliabili-
ty 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 6 (Maintenance) to keep your com-
pressor in top operating condition. Should any
questions arise which cannot be answered in the
following text, call your nearest Sullair office or the
Sullair Corporation Service Department.
2.2 DESCRIPTION OF COMPONENTS
Refer to Figure 2-1. The components and assem-
blies of the ES-6 Series air compressor are clearly
shown. The complete compressor consists of an
encapsulated compressor system, inlet system,
cooling system and control system.
The compact design of the ES-6 Series air com-
pressor provides easy access to all serviceable
components.
2.3 ENCAPSULATED COMPRESSOR SYSTEM,
FUNCTIONAL DESCRIPTION
Refer to Figure 2-2. The encapsulated compressor
includes compressor unit, fluid management sys-
tem, and motor section. The Sullair compressor unit
is a single-stage positive displacement lubricated
type compressor. This unit is equipped with tapered
roller bearings on the discharge, and cylindrical
roller bearings on the inlet end for high load carry-
ing capacity. This unit provides continuous pulse-
free air compression to meet your needs. With a
Sullair compressor there will be no maintenance or
internal inspection of the compressor.
DO NOT remove caps, plugs and/or other compo-
nents when compressor is running or pressurized.
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
rotors 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. Seals the clearances between the rotors and the
stator and also between the rotors themselves.
3. It acts as a lubricating film between the rotors
allowing one rotor to directly drive the other,
which is an idler.
The air/fluid mixture discharges directly into the
fluid management system.
The thermal valve helps assure proper cooling by
directing the fluid to the fluid cooler when discharge
temperature reaches the thermostat temperature
setting.
All fluid entering the compressor unit passes
through the replaceable fluid filter element. This
replaceable 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 an
air/fluid separator, thermal valve and fluid filter.
As compressed air/fluid enters the sump, the first
fluid separation takes place due to a reduction of
speed coupled with a change in direction of the flow
within the sump housing. Then the compressed air
reaches the separator, where the finest fluid drops
and mist are separated.
MOTOR/DRIVE SECTION
The motor/drive section consists of a squirrel
cage induction motor and integrated drive gear-
ing, which is separated from the motor by a
replaceable shaft seal.
The minimum pressure/discharge check valve is
mounted on the compressor drive housing. Its func-
tions are as follows:
1. Maintain a minimum sump pressure of 4.1 bar
under full load operation to help assure ade-
quate fluid pressure.
2. Act as a check valve to isolate the compressor
from the system at shutdown or unload.
2.4 COMPRESSOR COOLING SYSTEM, FUNCTION-
AL DESCRIPTION
The compressor cooling system consists of a fluid
cooler, fan and cooler shroud.
The fan is mounted on the motor's shaft end oppo-
site to the compressor. Air is drawn over the motor
as well as through the cooler. The air provides
motor cooling and removes compression heat from
the fluid.
2.5 AIR INLET SYSTEM, FUNCTIONAL DESCRIP-
TION
The compressor inlet system consists of a dry-
type air filter and an air control valve. Reacting
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