Sullair LS-10 25HP Operators Manual And Parts Lists page 43

additional damage to the compressor. Always re-
member to:
1. Check for loose wiring.
2. Check for damaged piping.
3. Check for parts damaged by heat or an electrical
TROUBLESHOOTING -- STANDARD ELECTRO/MECHANICAL
SYMPTOM
COMPRESSOR WILL NOT START
COMPRESSOR SHUTS DOWN WITH
AIR DEMAND PRESENT
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
Discharge Temperature Switch Open
MAINTENANCE
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.
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 oper---
ating pressure of the compressor (specified
on nameplate).
Consult power company.
Defect in line pressure switch; check pressure
at which contact points open.
Separator requires maintenance; check
maintenance indicator under full load condi---
tions.
High pressure shutdown switch is defective;
replace.
Defective valve; regulator valve should
cause inlet valve to close when the pressure
switch contacts open. Repair if defective.
Defective blowdown valve; blowdown valve
should exhaust sump pressure to 10 to
15 psig (0.7 to 1.0 bar) when maximum
operating pressure is reached. Repair if
defective.
Cooling water temperature too high;
increase water flow (water--- cooled only).
Cooling water flow insufficient; check water
lines and valves (water--- cooled only).
Cooler plugged; clean tubes. If plugging
persists, install water conditioner
(water--- cooled only).
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
and change the bearing filter element if
maintenance indicator shows red.
Thermal valve not functioning properly;
replace element.
Water flow regulating valve not functioning
properly; change (water--- cooled only).
Defective discharge temperature switch;
check for a short or open circuit to probe
and correct wiring.
Section 7
REMEDY
37