Section 6
MAINTENANCE
23
6.7 TROUBLESHOOTING
The information contained in the Troubleshooting
chart is based upon both the actual applied situa-
tions 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-
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.
6.8 TROUBLESHOOTING GUIDE
SYMPTOM PROBABLE CAUSE REMEDY
COMPRESSOR WILL NOT START Main Disconnect Switch Open Close switch.
Line Fuse Blown Replace fuse.
Control Transformer Fuse Blown Replace fuse.
Motor Starter Overloads Tripped Reset. Should trouble persist, check
whether motor starter contacts are
functioning properly.
Low Incoming Line Voltage Check voltage. Should voltage check low,
consult power company.
COMPRESSOR SHUTS DOWN Low Incoming Voltage Consult power company
WITH AIR DEMAND PRESENT .
Excessive Operating Pressure Defect in pressure switch; check pressure
at which contact points open.
Discharge Temperature Switch Open Cooling air flow restricted; clean cooler and
check for proper ventilation.
Ambient temperature is too high; provide
sufficient ventilation.
Low fluid level; add fluid.
Clogged filter; change the fluid filter
element.
Thermal valve not functioning; replace
element.
Defective discharge temperature switch;
check for a short or open circuit to probe
and correct wiring.
COMPRESSOR WILL NOT BUILD Air Demand Is Too Great Check service lines for leaks or open
UP FULL DISCHARGE PRESSURE valves.
Dirty Air Filter Check filter and change element if
required.
Pressure Regulator Out Of Adjust regulator according to control
A dj us t m ent adj us t m ent i ns t ruc t i ons i n S ec t i on 6,
Maintenance.
Defective Solenoid Valve A normally open solenoid must energize to
load compressor; check for proper
operation.
LI NE P RE S S URE RI S E S A B O V E Def ec t i v e S ol enoi d Val v e repai r s ol enoi d v al v e (s ee S ec t i on 6).
CUT--OUT PRESSURE SETTING
ON PRESSURE SWITCH Leak In Control System Causing Check for leaks.
Loss of Pressure Signals
Defective Pressure Switch Check that diaphragm and contacts are not
damaged. Replace if necessary.
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