Sullair LS-25S-257KW, Operator'S Manual And Parts List

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Section 6
MAINTENANCE
36
6.9 TROUBLESHOOTING (CONTINUED)
SYMPTOM PROBABLE CAUSE REMEDY
COMPRESSOR WILL NOT START Supervisor Panel Fuse is Blown Replace fuse.
(CONT.) Low Incoming Line Voltage Check voltage. Should voltage check low,
consult power company.
Replace Supervisor controller if no display
or erratic display.
COMPRESSOR SHUTS DOWN Loss of Control Voltage Reset. If trouble persists, check that line
WITH AIR DEMAND PRESENT pressure does not exceed maximum
operating pressure of the compressor
(specified on nameplate).
Low Incoming Voltage Consult power company. The Sullair
Supervisor will provide indication of most
maintenance problems if control power has
not been lost. Shutdowns will occur upon a
faulty condition or a bad sender condition.
Excessive Operating Pressure Check maximum P2 pressure setting.
“High Press P1” display; Max P1 pressure
may be set too low. Consult factory for
recalibration.
Defective solenoid valve; solenoid valve
should cause control lever to move to
unload stop when the pressure switch
contacts open. Repair if defective.
Defective blowdown valve; blowdown valve
should exhaust sump pressure to 40 to 50
psig (2.8 bar to 3.4 bar) when maximum
operating pressure is reached. Repair if
defective.
Open or shorted P1, P2, P3 or P4 sender
message; replace sender indicated.
Cooling air flow restricted; clean cooler and
check for proper ventilation.
Ambient temperature is too high; provide
sufficient ventilation.
Low fluid level; add fluid.
Clogged filter; change the fluid filter
element as indicated by Supervisor control.
Thermal valve not functioning properly;
replace element (air---cooled only).
Water flow regulating valve not functioning
properly; change (water---cooled only).
Open or shorted T1 or T2 sender; check for
a short or open circuit to probe and
correct wiring.
Low Fluid Pressure
(“Low Pressure P3” display) Check fluid level.
PRESSURE RELIEF VALVE Defective Pressure Relief Valve Replace pressure relief valve.
OPENS REPEATEDLY Check Separator Differential
(plugged)
Δ
P1
.
LIQUID WATER IN COMPRESSED Water Vapor Condensation From Cooling Remove the water vapor from compressed air prior
AIR LINES and Compression Occurs Naturally to distribution through the air system. Check
operation of aftercooler and moisture separator.
Install a compressed air dryer sized for the flow and
dryness level required. (Note: Filters may also be
required to remove particulates, liquid oil aerosols
or for oil vapor removal. Change cartridges as
recommended by the filter manufacturer.) Check all
drain traps routinely to insure their proper
operation. Maintain them regularly.