Sullair 20/12 500 CFM, Operator'S Manual And Parts List

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Section 6
MAINTENANCE
33
TROUBLESHOOTING (CONTINUED)
SYMPTOM PROBABLE CAUSE REMEDY
LINE PRESSURE RISES ABOVE
CUT--OUT PRESSURE SETTING
ON PRESSURE SWITCH (cont.) Defective Blowdown Valve Check that sump pressure is exhausted to
the atmosphere when the pressure switch
contacts close or repair or replace if
necessary (kit available).
High Pressure Shutdown is
Defective or Adjustment is
Incorrect Readjust or replace.
EXCESSIVE COMPRESSOR
LUBRICANT CONSUMPTION Clogged Return Line or Orifice Clean strainer (screen and o--ring replace--
ment kit available).
Clean orifice.
Separator Element Damaged or
Not Functioning Properly Change separator.
Leak in the Lubrication System Check all pipes, connections and compo--
nents.
PRESSURE RELIEF VALVE
OPENS REPEATEDLY High Pressure Shutdown Switch is
Defective or Out of Adjustment Readjust below pressure relief valve setting
or replace.
Defective Pressure Relief Valve Replace pressure relief valve.
Defective Pressure Gauge Replace.
Defective Minimum Pressure Valve Repair or replace.
High Separator Differential Replace separator.
PRESSURE RELIEF VALVE
OPENS REPEATEDLY (cont’d.) Defective Blowdown Valve Repair or replace.
Defective Muffler Replace.
Defective Pressure Switch Repair or replace.
Defective Pilot Valve Repair or replace.
Defective Sullicon Diaphragm Replace diaphragm.
Incorrect Unload Stop Screw
Position Reposition and tighten.
Incorrect Inlet Butterfly Position Reposition and tighten.
Inlet Butterfly Loose Reposition and tighten.
Plugged Frozen Control Lines Replace or thaw as needed.
Defective Shaft Seal Replace shaft seal.