Section 7
MAINTENANCE
44
COMPRESSOR SHUTS DOWN
WITH AIR DEMAND PRESENT
(CONT.)
COMPRESSOR WILL NOT
BUILD FULL DISCHARGE PRES-
SURE
LINE PRESSURE RISES ABOVE
CUT-OUT PRESSURE SETTING
ON PRESSURE SWITCH
Excessive Operating Pressure (Cont)
Discharge Temperature Switch Open
Air Demand is Too Great
Dirty Air Filter
Pressure Regulator Out of
Adjustment
Defective Pressure Regulator
Leak in Control System Causing
Loss of Pressure Signals
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 per-
sists, 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.
Check service lines for leaks or open valves
up.
Check the filter indicator and inspect and/or
change element if required.
Adjust regulator according to control adjust-
ment instructions in the Maintenance section.
Check diaphragm and replace if necessary
(kit available).
Check for leaks.
7.10 TROUBLESHOOTING GUIDE- STANDARD ELECTRO-MECHANICAL(CONTINUED)
SYMPTOM PROBABLE CAUSE REMEDY
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