Troubleshooting Guide - Sullair LS20T Operator's Manual And Parts List

8.1 TROUBLESHOOTING
The information contained in the Troubleshooting
chart is based upon both actual applied situations
and extensive testing at the factory. It contains
symptoms and usual causes for the described prob-
lems. However, DO NOT assume that these are the
only problems that may occur. All available data
concerning the trouble should be systematically
analyzed before undertaking any repair or compo-
nent replacement procedures.
A detailed visual inspection is worth performing for
almost any problems which may prevent unneces-

8.2 TROUBLESHOOTING GUIDE

SYMPTOM
COMPRESSOR WILL
NOT START
COMPRESSOR
SHUTS DOWN
PROBABLE CAUSE
Main Disconnect Switch Open
Line Fuse Blown
Control Transformer Fuse Blown
Motor Starter Overloads Tripped
Low Incoming Line Voltage
Loss of Control Voltage
Low Incoming Voltage
Excessive Operating Pressure
High Discharge Temperature
TROUBLESHOOTING
sary damage to the compressor. Always remember
to:
a. Check for loose wiring.
b. Check for damaged piping.
c.Check for parts damaged by heat or an
electrical short circuit, usually apparent by
discoloration or a burnt odor.
Should your problem persist after making the rec-
ommended check, consult your nearest Sullair rep-
resentative or the Sullair Corporation factory.
REMEDY
Close switch.
Replace fuse.
Replace fuse.
Reset. Should trouble persist, check whether motor
starter contacts are functioning properly.
Check voltage. Should voltage check low, consult power
company.
Reset. If trouble persists, check that line pressure does
not exceed maximum operating pressure of the com-
pressor (specified on nameplate).
Consult power company.
Separator requires maintenance; check dP1 under full
load conditions.
High pressure shutdown parameter is adjusted too low;
readjust.
Defective blowdown solenoid valve; repair if defective (kit
available).
Defective blowdown valve; blowdown valve should
exhaust sump pressure to the atmosphere when maxi-
mum operating pressure is reached. Repair or replace as
necessary (kit available).
Cooling water temperature too high; increase water flow
(water-cooled).
Cooling water flow insufficient; check water lines and
valves. (water-cooled).
Cooler plugged; clean tubes. If plugging persists, install
water conditioner. (water-cooled).
Section 8
CONTINUED...
37