Sullair LS-12 User Manual

Section 6
MAINTENANCE
27
TROUBLESHOOTING (CONTINUED)
SYMPTOM PROBABLE CAUSE REMEDY
COMPRESSOR SHUTS DOWN Low Incoming Voltage Consult power company.
WITH AIR DEMAND PRESENT
(continued) Excessive Operating Pressure Defect in pressure switch; check pressure
at which contact points open.
Separator requires maintenance; check
maintenance indicator under full load condi---
tions.
High pressure shutdown switch is adjusted
too low; readjust to 135 psig (9.3 bar).
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
55 psig (2.8 to 3.8 bar) when maximum
operating pressure is reached. Repair if
defective.
Discharge Temperature Switch Open 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 per---
sists, 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
and change the bearing filter element if
maintenance indicator shows red.
Thermal valve not functioning properly;
replace element (air---cooled only).
Water flow regulating valve not functioning
properly; change (water---cooled only).
Defective discharge temperature switch;
check for a short or open circuit to probe
and correct wiring.
COMPRES SOR WILL NOT BUILD UP Air Demand Is Too Great Check service lines for leaks or open valves.
FULL DISCHARGE PRESSURE
Dirty Air Filter Check the filter indicator and change element
if required.
Pressure Regulator Out Of Adjust regulator according to control
Adjustment adjustment instructions in the Maintenance
section.
Defective Pressure Regulator Check diaphragm and replace if necessary
(kit available).
LINE PRESSURE RISES ABOVE Leak In Control System Causing Check for leaks.
CUT---OUT PRESSURE SETTING ON Loss Of Pressure Signals
PRESSURE SWITCH
Defective Pressure Switch Check that diaphragm and contacts are not
damaged. Replace if necessary.

Sullair LS-12 Specifications

General

Brand	Sullair
Model	LS-12
Category	Air Compressor
Language	English