Section 6
OPERATION
27
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.
CONTINUED...
6.2 PURPOSE OF CONTROLS
CONTROL OR INDICATION
PURPOSE
FLUID LEVEL SIGHT GLASS
Monitors fluid level in the sump. Proper level should fill the sight
glass. Check level when the compressor is shut down. DO NOT
OVERFILL.
SEPARATOR RETURN LINE SIGHT
GLASS
Used to indicate fluid flow in the return lines. When the compres-
sor is running at full load, fluid flow should be visible in this sight
glass. There may b little or no flow when the compressor is run-
ning unloaded, but a sluggish flow at full load indicates a need to
clean the return line strainer.
FLUID STOP VALVE
Cuts off flow of fluid to compressor unit at compressor shutdown
and allows flow of fluid to the unit on startup.
DISCHARGE CHECK VALVE
Cuts off the reverse flow of air/fluid mixture through compressor
discharge system at compressor shutdown.
THERMAL VALVE
Regulates flow of fluid to and around the cooler. Designed to
maintain a minimum operating temperature of 220ºF (104ºC).
Also used for fast warm-up on startup.
MINIMUM PRESSURE/CHECK
VALVE
Maintains minimum of 160 psig (11 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 shut-
down.
PRESSURE RELIEF VALVE (SUMP)
Opens sump pressure to the atmosphere should pressure inside
the sump becomes too high (400 psig [27.6 bar]). Operation of
this valve indicates that the high pressure transducer is either
faulty or out of adjustment.
PRESSURE RELIEF VALVE (INTER-
STAGE)
Opens interstage of compressor to atmosphere should the pres-
sure become too high (150 psig [10.3 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.
INLET POPPET VALVE
Regulates the amount of air allowed to enter the inlet. This regu-
lation is determined by the amount of air being used at the service
line.
PRESSURE REGULATOR (INLET
POPPET VALVE)
Opens a pressure line between the sump and inlet poppet valve
allowing to regulate air delivery according to the air demand.
PRESSURE REGULATOR
(UNLOAD)
Opens a pressure line between the sump and the inlet poppet
valve to regulate the unload pressure.
Summary of Contents for LS20T 1100 CFM
Page 18: ...Section 2 DESCRIPTION 12 Figure 2 3B Control System Diagram START...
Page 19: ...Section 2 DESCRIPTION 13 Figure 2 3C Control System Diagram MODULATION...
Page 20: ...Section 2 DESCRIPTION 14 Figure 2 3D Control System Diagram FULL LOAD...
Page 21: ...Section 2 DESCRIPTION 15 Figure 2 3E Control System Diagram UNLOAD...
Page 44: ...NOTES 38...
Page 104: ...Section 9 ILLUSTRATIONS AND PARTS LIST 98 02250146 367R00 9 19 CONTROL START SYSTEM...
Page 106: ...Section 9 ILLUSTRATIONS AND PARTS LIST 100 02250146 367R00 9 19 CONTROL START SYSTEM...
Page 108: ...Section 9 ILLUSTRATIONS AND PARTS LIST 102 02250138 633R00 9 20 CONTROL PANEL...
Page 110: ...Section 9 ILLUSTRATIONS AND PARTS LIST 104 02250139 119R01 9 21 ENCLOSURE...
Page 112: ...Section 9 ILLUSTRATIONS AND PARTS LIST 106 02250139 119R01 9 21 ENCLOSURE...
Page 114: ...Section 9 ILLUSTRATIONS AND PARTS LIST 108 9 22 DECAL GROUP...
Page 116: ...Section 9 ILLUSTRATIONS AND PARTS LIST 110 9 22 DECAL GROUP...
Page 118: ...Section 9 ILLUSTRATIONS AND PARTS LIST 112 9 22 DECAL GROUP...
Page 120: ...Section 9 ILLUSTRATIONS AND PARTS LIST 114 9 23 DECAL LOCATIONS OPEN AIR COOLED...
Page 122: ...Section 9 ILLUSTRATIONS AND PARTS LIST 116 9 24 DECAL LOCATIONS OPEN WATER COOLED...
Page 124: ...Section 9 ILLUSTRATIONS AND PARTS LIST 118 9 25 DECAL LOCATIONS REMOTE COOLER...
Page 126: ...Section 9 ILLUSTRATIONS AND PARTS LIST 120 9 26 DECAL LOCATIONS CONTROL BOX...
Page 128: ...Section 9 ILLUSTRATIONS AND PARTS LIST 122 9 27 ENCLOSURE DECALS...
Page 145: ...NOTES 139...
