Troubleshooting - Sullair 20/12 Series Operator's Manual

Section 6
MAINTENANCE

TROUBLESHOOTING

SYMPTOM
COMPRESSOR WILL NOT START
COMPRESSOR SHUTS DOWN
WITH AIR DEMAND PRESENT
30
PROBABLE CAUSE
Main Disconnect Switch Open
Line Fuse Blown
Control Transformer Fuse Blown
Motor Starter Overloads Tripped
Low Incoming Line Voltage
Defective Discharge Temperature
Thermistor Switch
Loss of Control Voltage
Low Incoming Voltage
Excessive Operating Pressure
Discharge Temperature Thermistor
Switch Open
check for proper ventilation (air cooled),
cient ventilation (air cooled).
Low Fluid Pressure
Low Water Pressure
REMEDY
Close switch.
Replace fuse.
Replace fuse.
Reset. Should trouble persist, check whether
motor starter contacts are functioning
properly.
Check voltage. Should voltage check low,
consult power company.
Replace probe and/or board.
Reset. If trouble persists, check that line
pressure does not exceed maximum operat-
ing pressure of the compressor (specified on
nameplate).
Consult power company.
Defect in pressure switch; check pressure at
which contact points open.
Separator requires maintenance; check
maintenance indicator under full load condi-
tions.
High pressure shutdown switch is adjusted
too low; readjust.
Defective pilot solenoid valve; solenoid valve
should cause Sullicon Control to close the in
let butterfly when the pressure switch con-
tacts open. Repair if defective.
Defective blowdown valve; blowdown valve
should exhaust sump pressure to the
atmosphere when maximum operating
pressure is reached. Repair.
Cooling water temperature too high;
increase water flow.
Cooling water flow insufficient; check water
lines and valves.
Cooler plugged; clean tubes. If plugging
persists, install water conditioner.
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.
Cooling air flow restricted; clean cooler and
Ambient temperature too high; provide suffi-
Defective discharge temperature thermistor
switch; check for a short or open circuit to
probe and correct wiring, or 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 normally, it
is possible that the thermistor probe is defe-
tive.
Clogged filter; clean main fluid filter element
or change bearing filter element.
Check water lines and valves.