Section 2
DESCRIPTION
5
2.1 INTRODUCTION
Your new Sullair lubricated rotary screw air com-
pressor will provide you with a unique experience in
improved reliability and greatly reduced mainte-
nance.
Compared to other types of compressors, the
Sullair rotary screw is unique in mechanical reliabil-
ity, with minimal wear and no inspection required of
the working parts within the compressor unit.
Read Section
7
(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
. The components and assem-
blies of the air compressor are clearly shown. The
complete package includes
compressor
,
electric
motor
,
compressor inlet system
,
compressor
discharge system
,
compressor cooling and
lubrication system
,
capacity control system
and
“
Supervisor™ Controller
” all mounted on a struc-
tural steel frame.
2.3 SULLAIR COMPRESSOR UNIT, FUNCTIONAL
DESCRIPTION
Sullair air compressors feature the Sullair compres-
sor unit, a two-stage, positive displacement, lubri-
cated-type compressor. This unit provides continu-
ous pulse-free air compression to meet your needs.
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.
Fluid is injected into the compressor unit at each
stage, and mixes directly with the air as the rotors
turn, compressing the air. The fluid flow has three
main functions:
• As coolant, it controls the rise of air temper-
ature normally associated with the heat of
compression.
• Seals between the rotors and the stator and
also between the rotors themselves.
• 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 to the service line and the
fluid is cooled in preparation for reinjection.
2.4 COMPRESSOR COOLING AND LUBRICATION
SYSTEM, FUNCTIONAL DESCRIPTION
. The
cooling and
lubrication system
consists of a
fluid cooler
,
aftercooler
,
full flow fluid filter
,
fluid stop valve
,
thermal valve
and
interconnection piping
.
Water-cooled models utilize a
shell and tube fluid
cooler
and
aftercooler
, which are mounted on the
compressor package.
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-
pressor unit.
Fluid flows from the bottom of the receiver/sump to
the thermal valve. The thermal valve bypass is fully
open when the discharge temperature is below
250ºF (121.1ºC). The fluid passes through the ther-
mal valve, the main fluid filter and directly to the
compressor unit, thus feeding the bearings, seals
and rotor area.
As the discharge temperature rises above 250ºF
(121.1ºC), due to the heat of compression, the
thermal valve bypass begins to close and a portion
of the fluid then flows through the cooler. From the
cooler, the fluid flows to the main filter and on to the
compressor unit. The fluid filter has a replacement
element and an integral pressure bypass valve.
The fluid stop valve prevents fluid from filling the
compressor unit when the compressor is shut
down. When the compressor is operating, the fluid
stop valve is held open by air pressure from the
compressor unit allowing a free flow of fluid from the
receiver/sump back to the compressor unit. On
shutdown, the compressor unit pressure is reduced,
causing the fluid stop valve to close and isolate the
compressor unit from the cooling system.
2.5 COMPRESSOR DISCHARGE SYSTEM, FUNC-
TIONAL DESCRIPTION
. The compressor unit
discharges the compressed air/fluid moisture
through a discharge check valve into the combina-
tion receiver/sump. The discharge check valve pre-
vents air in the receiver from returning to the com-
pression chamber after the compressor has been
shut down. The receiver has three functions:
• It acts as a primary fluid separator.
• Serves as the compressor fluid sump.
• Houses the final fluid separator elements.
The compressed air/fluid mixture enters the receiv-
er and is directed against the ends of the tank. The
direction of movement is changed and its velocity
Summary of Contents for LS-20T
Page 6: ......
Page 20: ...Section 2 DESCRIPTION 14 Figure 2 4A Control System Diagram Functional Components...
Page 21: ...Section 2 DESCRIPTION 15 Figure 2 4B Control System Diagram START...
Page 22: ...Section 2 DESCRIPTION 16 Figure 2 4C Control System Diagram MODULATION...
Page 23: ...Section 2 DESCRIPTION 17 Figure 2 4D Control System Diagram FULL LOAD...
Page 24: ...Section 2 DESCRIPTION 18 Figure 2 4E Control System Diagram UNLOAD...
Page 26: ...NOTES 20...
Page 30: ...NOTES 24...
Page 34: ...NOTES 28...
Page 42: ...NOTES 36...
Page 46: ...NOTES 40...
Page 49: ...NOTES 43...
Page 50: ...Section 9 ILLUSTRATIONS AND PARTS LIST 44 02250137 909R00 9 3 MOTOR FRAME COMPRESSOR AND PARTS...
Page 52: ...Section 9 ILLUSTRATIONS AND PARTS LIST 46 02250137 907R03 9 4 AIR INLET SYSTEM...
Page 54: ...Section 9 ILLUSTRATIONS AND PARTS LIST 48 02250137 907R03 9 4 AIR INLET SYSTEM...
Page 56: ...Section 9 ILLUSTRATIONS AND PARTS LIST 50 02250138 702R00 9 5 AIR INLET SUB ASSEMBLY...
Page 58: ...Section 9 ILLUSTRATIONS AND PARTS LIST 52 02250137 908R00 9 6 WATER COOLING SYSTEM...
Page 60: ...Section 9 ILLUSTRATIONS AND PARTS LIST 54 02250137 910R01 9 7 AIR PIPING SYTEM...
Page 62: ...Section 9 ILLUSTRATIONS AND PARTS LIST 56 02250137 912R01 9 8 FLUID PIPING SYSTEM...
Page 64: ...Section 9 ILLUSTRATIONS AND PARTS LIST 58 02250139 798R00 9 9 WATER PIPING SYSTEM...
Page 66: ...Section 9 ILLUSTRATIONS AND PARTS LIST 60 02250137 911R01 9 10 DISCHARGE SYSTEM...
Page 68: ...Section 9 ILLUSTRATIONS AND PARTS LIST 62 02250137 911R01 9 10 DISCHARGE SYSTEM...
Page 70: ...Section 9 ILLUSTRATIONS AND PARTS LIST 64 02250137 911R01 9 10 DISCHARGE SYSTEM...
Page 72: ...Section 9 ILLUSTRATIONS AND PARTS LIST 66 02250137 914R02 9 11 CONTROL START SYSTEM...
Page 74: ...Section 9 ILLUSTRATIONS AND PARTS LIST 68 02250137 914R02 9 11 CONTROL START SYSTEM...
Page 76: ...Section 9 ILLUSTRATIONS AND PARTS LIST 70 9 12 CONTROL PANEL 02250138 633R00...
Page 78: ...Section 9 ILLUSTRATIONS AND PARTS LIST 72 9 13 ENCLOSURE 02250138 672R00...
Page 80: ...Section 9 ILLUSTRATIONS AND PARTS LIST 74 9 13 ENCLOSURE 02250138 672R00...
Page 82: ...Section 9 ILLUSTRATIONS AND PARTS LIST 76 9 14 DECAL GROUP...
Page 84: ...Section 9 ILLUSTRATIONS AND PARTS LIST 78 9 14 DECAL GROUP...
Page 86: ...Section 9 ILLUSTRATIONS AND PARTS LIST 80 9 14 DECAL GROUP...
Page 88: ...Section 9 ILLUSTRATIONS AND PARTS LIST 82 9 15 DECAL LOCATION OPEN MODEL...
Page 90: ...Section 9 ILLUSTRATIONS AND PARTS LIST 84 9 16 DECAL LOCATION ENCLOSED MODEL...
Page 92: ...Section 9 ILLUSTRATIONS AND PARTS LIST 86 9 17 DECAL LOCATION CONTROL BOX...
Page 94: ...Section 9 ILLUSTRATIONS AND PARTS LIST 88 9 18 WIRING DIAGRAM LS20T 525 PSIG 02250137 917R01...
Page 95: ...NOTES 89...