Section 6
OPERATION
29
6.1 GENERAL
While Sullair has built into this compressor a com-
prehensive array of controls and indicators to
assure you that it is operating properly, you will
want to recognize and interpret the reading which
will call for service or indicate the beginning of a
malfunction. Before starting your Sullair compres-
sor, read this section thoroughly and familiarize
yourself with the controls and indicators - their pur-
pose, location and use.
FLUID LEVEL SIGHT GLASS
SEPARATOR RETURN LINE SIGHT
GLASS
FLUID STOP VALVE
DISCHARGE CHECK VALVE
THERMAL VALVE
MINIMUM PRESSURE/CHECK VALVE
PRESSURE RELIEF VALVE (SUMP)
PRESSURE RELIEF VALVE (INTER-
STAGE)
INLET POPPET VALVE
PRESSURE REGULATOR (INLET POP-
PET VALVE)
PRESSURE REGULATOR (UNLOAD)
Monitors fluid level in the sump. Proper level should fill the
sight glass. Check level when the compressor is shut down.
DO NOT OVERFILL
.
Used to indicate fluid flow in the return lines. When the com-
pressor is running at full load, fluid flow should be visible in
this sight glass. There may be little or no flow when the com-
pressor is running unloaded, but a sluggish flow at full load
indicates a need to clean the return line strainer.
Cuts off flow of fluid to compressor unit at compressor shut-
down and allows flow of fluid to the unit on startup.
Cuts off the reverse flow of air/fluid mixture through compres-
sor discharge system at compressor shutdown.
Regulates flow of fluid to and around the cooler. Designed to
maintain a minimum operating temperature of 250ºF (121ºC).
Also used for fast warm-up on startup.
Maintains minimum of 170 psig (11.7 bar) in the compressor
sump. Valve piston restricts receiver air discharge from
receiver/sump when pressure falls to 160 psig (11 bar).
Prevents line pressure backflow into the sump during unload
conditions and after shutdown.
Opens sump pressure to the atmosphere should pressure
inside the sump becomes too high (600 psig [41.4 bar]).
Operation of this valve indicates that there is a mechanical or
electrical malfunction.
Opens interstage of compressor to atmosphere should the
pressure become too high (200 psig [13.8 bar]). Operation of
this valve indicates unit pressurization during shutdown.
Causes may be plugged control lines, faulty discharge check
valve, or faulty fluid stop valve.
Regulates the amount of air allowed to enter the air inlet
valve. This regulation is determined by the amount of air
being used at the service line.
Opens a pressure line between the sump and inlet poppet
valve allowing to regulate air delivery according to the air
demand.
Opens a pressure line between the sump and the inlet poppet
valve to regulate the unload pressure.
6.2 PURPOSE OF CONTROLS
CONTROL OR INDICATION
PURPOSE
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...