DE-18 USER MANUAL SECTION 9
98
LO P3 SD Oil Pressure Falls Below 30 psig (2.1
barg) While Package is Running
Because:
Oil Pump Malfunctioned Consult Sullair Service Department.
Oil Filter Dirty Replace filter element.
Oil Temperature Too Low Check state of thermal valve leading oil
cooler.
Sump Oil Heater Malfunctions Replace heater.
Sump Oil Level Too low Replenish oil level.
Sump Strainer Clogged Refer to OIL SUMP STRAINER
MAINTENANCE on page 86.
Oil Bypass Valve Setting Changed Reset valve.
HI T1 SD Compressor Inlet Air Temperature
Above
Maintain inlet air temperature below 115°F
(46°C).
High Interstage Pressure (loaded) Defective HP stage.
High Interstage Pressure (Unloaded) Clogged blowdown silencer. Clean/
replace.
Temperature Transducer Failure Check connections from transducer. If
adequate, replace transducer.
Slowdown Valve Failed to Open or
Operated Sluggishly During Unload
Refer to BLOWDOWN VALVE
MAINTENANCE on page 86.
HI T2 SD Intercooler Core Fouled Clean tinning.
Discharge Check Valve Leaking During
Unloaded Operation
Inspect check valve spring, flappers and
shaft.
Inlet Throttling Valve Not Fully Open
During Loaded Operation
See inlet valve adjustment.
Low oil pressure defective control solenoid
valve.
Inlet Air Filter Clogged See AIR FILTER INSPECTION/
MAINTENANCE ELEMENT INSPECTION
on page 82.
Line Pressure is Too High Reset controller unload pressure.
Temperature Transducer Failure Check connection from transducer. If
adequate. replace transducer.
Slowdown Valve Failed to Open or
Operated Sluggishly
Refer to BLOWDOWN VALVE
MAINTENANCE on page 86.
Low Fan Speed Re-tension fan belt or replace if damaged.
HI P1 SD Defective HP Stage Consult Sullair Service Department.
Pressure Transducer Failure Check connection from transducer. If
adequate, replace transducer.
HI T3 SD Temperature Transducer Failure Check connections from transducer. If
adequate, replace transducer.
Oil Cooler Fouled Clean fins.
Low Fan Speed Re-tension fan belt or replace if necessary.
SYMPTOM/MESSAGE PROBABLY CAUSE REMEDY
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