Troubleshooting - Sullair LS-25S Operator's Manual And Parts List

TROUBLESHOOTING

SYMPTOM
COMPRESSOR WILL NOT START
COMPRESSOR SHUTS DOWN
WITH AIR DEMAND PRESENT
PROBABLE CAUSE
Main Disconnect Switch Open
Line Fuse Blown
Control Transformer Fuse Blown
Motor Starter Overloads Tripped
Low Incoming Line Voltage
Supervisor Panel Fuse is Blown
Loss of Control Voltage
Low Incoming Voltage
Excessive Operating Pressure
"High Temp T1" or "T3" Message
Displayed
Section 6
MAINTENANCE
REMEDY
Close switch.
Replace fuse.
Replace fuse.
Reset. Should trouble persist, check
whether motor starter contacts are
functioning properly.
Check voltage. Should voltage check low,
consult power company.
Replace fuse.
Replace Supervisor controller if no display
or erratic display.
Reset. If trouble persists, check that line
pressure does not exceed maximum
operating pressure of the compressor
(specified on nameplate).
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.
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 water temperature too high;
increase water flow (water---cooled only).
Cooling water flow insufficient; check water
lines and valves (water---cooled only).
Cooler plugged; clean tubes. If plugging
persists, install water conditioner
(water---cooled only).
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.
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