Section 6
MAINTENANCE
29
TROUBLESHOOTING
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 Re ---set. 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 Loss of Control Voltage Re---set. If trouble persists, check that line
WITH AIR DEMAND PRESENT pressure does not exceed maximum operating
pressure of the compressor (specified on
nameplate).
Low Incoming Voltage Consult power company.
Excessive Operating Pressure Defect in 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 adjusted too
low; re---adjust to 135 psig (9.3 bar).
Defective solenoid valve; solenoid valve should
cause control lever to move to unload stop when the
pressure switch contacts open. Repair if
defective.
Defective blowdown valve; blowdown valve
should exhaust sump pressure to 40 to 55 psi
(2.7 to 3.8 bar) when maximum operating
pressure is reached. Repair if defective.
Discharge Temperature Switch Open 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 suffi---
cient ventilation.
Low Fluid Pressure Low fluid level; add fluid.
Clogged filter; inspect the fluid filter element
and/or change the fluid filter element if main---
tenance indicator is showing red.
Thermal valve not functioning properly; change
(air---cooled only).
Low Water Pressure 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.
Check the fluid stop valve to be sure it is opening
properly on start---up of compressor.
COMPRESSOR WILL NOT BUILD Air Demand is Too Great Check service lines for leaks or open valves.
.UP FULL DISCHARGE PRESSURE
Dirty Air Filter Check the filter indicator and change element
if required.
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