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Section 5
MAINTENANCE
5.8 TROUBLESHOOTING - GUIDE (CONTINUED)
SYMPTOM
MACHINE WILL NOT START (cont.)
MACHINE SHUTS DOWN WITH AIR DE-
MAND PRESENT
22
CAUSE
Motor starter overloads tripped
Low incoming line voltage
Defective discharge temperature switch
Loss of control voltage
Low incoming voltage
Excessive operating pressure
Excessive operating pressure
Discharge temperature thermistor switch
open
p
Cooler plugged
REMEDY
Reset. Should trouble persist, check
whether motor starter contacts are func-
tioning properly.
Check voltage. Should voltage check
low, consult your power company.
Defective discharge temperature thermis-
tor switch. Check for a short or open cir-
cuit to the probe and correct wiring, or
also check for short or open circuit to
control card. If current is not present, re-
place the control card. Should the above
checkout normal, it is possible that the
thermistor probe is defective.
Reset. If trouble persists, check that line
pressure does not exceed max operating
pressure of your machine (specified on
nameplate).
Consult power company.
Defect in pressure switch, check pres-
sure at which contact points open.
Separator requires maintenance, check
maintenance indicator under full load
conditions.
High pressure shutdown switch is ad-
justed too low, readjust.
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
40-55 PSI when maximum operating
pressure is reached.
Cooling water temperature too high, in-
crease water flow (water-cooled only)
Cooling water flow insufficient. Check
water lines and valves (water-cooled
only).
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.
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