Sullair LS20T Operator's Manual And Parts List page 44

Section 8
TROUBLESHOOTING
8.2 TROUBLESHOOTING GUIDE (CONTINUED)
SYMPTOM
COMPRESSOR
SHUTS DOWN
(CONTINUED)
COMPRESSOR WILL
NOT BUILD UP FULL
DISCHARGE PRES-
SURE
LINE PRESSURE
RISES ABOVE P2
PRESSURE
38
PROBABLE CAUSE
High Discharge Temperature
(Cont.)
Low Fluid Pressure
Low Water Pressure
Air Demand is Too Great
Dirty Air Filter
Pilot Pressure Regulator Out of
Adjustment
Defective Pilot Pressure
Regulator
Defective Minimum Pressure
Valve
Inlet Valve Not Opening
Completely
Defective Control Inlet Solenoid
Valve
Leak in Control System Causing
Loss of Pressure Signals
Defective Blowdown Solenoid
Valve
Defective Blowdown Valve
REMEDY
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.
Clogged filter; replace fluid filter element
Check water lines and valves (water-cooled).
Check service lines for leaks or open valves.
Check the filter indicator and change or clean element if
required.
Adjust regulator according to control adjustment instruc-
tions in the Maintenance section.
Check diaphragm and replace if necessary (kit avail-
able).
Check that the piston is moving freely.
Check poppet regulating valve; signal must be 60 psi.
Readjust if necessary.
Repair or replace.
Check for leaks.
Repair or replace if necessary (kit available).
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).
CONTINUED...