Sullair LS20T 1100 CFM, Operator'S Manual And Parts List

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Section 8
TROUBLESHOOTING
36
CONTINUED...
8.2 TROUBLESHOOTING GUIDE (CONTINUED)
SYMPTOM PROBABLE CAUSE REMEDY
COMPRESSOR
SHUTS DOWN
(CONTINUED) High Discharge Temperature
(Cont.) Cooling water flow insufficient; check water lines and
valves (water-cooled).
Cooler plugged; clean tubes. If plugging persists, install
water conditioner (water-cooled).
Low fluid level; add fluid.
Clogged filter; change the fluid filter element if mainte-
nance indicator shows red, and/or dP2 on controller indi-
cates high dP.
Thermal valve not functioning properly; replace element.
Cooling air flow restricted; clean cooler and check for
proper ventilation (air-cooled).
Ambient temperature too high; provide sufficient ventila-
tion (air-cooled).
RTD probe out of calibration, or bad RTD. Replace if
necessary.
Low Fluid Pressure Clogged filter; replace fluid filter element.
Check oil stop valve for proper operation. Repair or
replace as necessary (kit available).
Low Water Pressure Check water lines and valves (water-cooled).
COMPRESSOR
WILL NOT BUILD
UP FULL DIS-
CHARGE PRES-
SURE Air Demand is Too Great Check service lines for leaks or open valves.
Dirty Air Filter Check the filter indicator and change or clean element if
required.
Pilot Pressure Regulator Out of
Adjustment Adjust regulator according to control adjustment instruc-
tions in the Maintenance section.
Defective Pilot Pressure Regulator Check diaphragm and replace if necessary (kit avail-
able).
Defective Minimum Pressure
Valve Check that the piston is moving freely.
Inlet Valve Not Opening
Completely Check poppet regulating valve; signal must be 60 psi.
Readjust if necessary.
Defective Control Inlet Solenoid
Valve Repair or replace.
LINE PRESSURE
RISES ABOVE P2
PRESSURE Leak in Control System Causing
Loss of Pressure Signals Check for leaks.