Sullair 20/12 Series Operator's Manual

Section 6
MAINTENANCE
30
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 Replace probe and/or board.
COMPRESSOR SHUTS DOWN
WITH AIR DEMAND PRESENT Loss of Control Voltage Reset. If trouble persists, check that line
pressure does not exceed maximum operat-
ing pressure of the compressor (specified on
nameplate).
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 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.
Discharge Temperature Thermistor
Switch Open 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
check for proper ventilation (air cooled),
Ambient temperature too high; provide suffi-
cient ventilation (air cooled).
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.
Low Fluid Pressure Clogged filter; clean main fluid filter element
or change bearing filter element.
Low Water Pressure Check water lines and valves.

Sullair 20/12 Series Specifications

General

Brand	Sullair
Model	20/12 Series
Category	Air Compressor
Language	English