Section 6
MAINTENANCE
32
TROUBLESHOOTING
SYMPTOM PROBABLE CAUSE REMEDY
COMPRESSOR WILL NO T 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
WITH AIR DEMAND PRESENT Loss of Control Voltage Reset; if trouble persists, check that line
pressure does not exceed maximum
operating pressure of the compressor
(specified on nameplate).
Low Incoming Voltage Consult p ower company.
Excessive Operating Pressure Defect in line pressure switch; check
pressure at which contact points open.
Separator requires maintenance; check
maintenance gauge under full load
conditions.
High pressure shut--- down switch is adjusted
too low; readjust to 135 PSIG (931kPa).
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 30 to 35
PSIG (207 to 241kPa) when maximum
operating p ressure is reached. Repair if
defective.
Discharge Temperature Switch Cooling water temperature too high;
Open 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 if indicated by the maintenance
gauge.
Thermal valve not f unctioning properly;
replace element (air---cooled only).
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.
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