Section 6
MAINTENANCE
32
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 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.
Defective discharge temperature
thermistor switch Check for a short or open circuit to the
probe and correct wiring. Also check for
short or open circuit to the control card. If
current is not present, replace the control
card. Should the above check out normal, it
is possible that the thermistor probe is
defective.
Compressor shuts down with
air demand present Loss of control voltage
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 gauge under full load condi---
tions.
High pressure shutdown switch is adjusted
too low; readjust to 135 PSIG (931kPa).
Defective pilot valve; pilot 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 atmos---
phere 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).
Ambient temperature is too high; provide
sufficient ventilation.
Low fluid level; add fluid.
Clogged filter; clean the main fluid filter
element and change the bearing filter
element if maintenance gauge shows red.
Defective discharge temperature thermis---
tor switch; Check for a short or open circuit
to the probe and correct wiring. Also check
for short or open circuit to the control card.
If current is not present, replace the
control card. Should the above check out
normal, it is possible that the thermistor
probe is defective.
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