Section 6
MAINTENANCE
52
6.9 TROUBLESHOOTING - GUIDE (CONTINUED)
SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION
VACUUM UNIT WILL
NOT START
(CONTINUED)
Defective Low Fluid Pressure
Switch Bypass Timer
Replace switch.
VACUUM UNIT SHUTS
DOWN WITH DEMAND
PRESENT
Loss of Control Voltage Check for loose wires.
Low Incoming Voltage Consult power company.
Excessive Vacuum Unit Discharge
Pressure
Defect in pressure switch; check pressure at
which contact points open.
Separator requires maintenance; check main-
tenance indicator under full load condi-tions.
High pressure shutdown switch is adjusted too
low; readjust to 12 psig (83kPa).
Discharge Line Pipe Size is Too
Small - Manifold of Multiple
Packages at Intallation
Correct piping/manifold to acceptable sizing.
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 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 suffi-
cient ventilation.
Low fluid level; add fluid.
Clogged filter; change the fluid filter element
and change the bearing filter element if main-
tenance indicator shows red.
Thermal valve not functioning 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.
Fluid pressure regulator set too low; adjust.
Fluid pump relief valve set too low; adjust.
Continued on page 53
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