Sullair LS20T - Page 44

Section 8
TROUBLESHOOTING
38
CONTINUED...
8.2 TROUBLESHOOTING GUIDE (CONTINUED)
SYMPTOM PROBABLE CAUSE REMEDY
COMPRESSOR
SHUTS DOWN
(CONTINUED)
High Discharge Temperature
(Cont.)
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
Low Water Pressure Check water lines and valves (water-cooled).
COMPRESSOR WILL
NOT BUILD UP FULL
DISCHARGE 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.
Defective Blowdown Solenoid
Valve
Repair or replace if necessary (kit available).
Defective Blowdown Valve Check that sump pressure is exhausted to the atmos-
phere when the unload pressure setting on Supervisor
Controller is met, or repair or replace if necessary (kit
available).