Sullair 20/12 Series User Manual

Section 6
MAINTENANCE
32
TROUBLESHOOTING (CONTINUED)
SYMPTOM PROBABLE CAUSE REMEDY
COMPRESSOR SHUTS DO WN
WITH AIR DEMAND PRESENT (cont.) Defective blowdown valve; blowdown valve
should exhaust sump pressure to the
atmosphere when maximum operating
pressure is reached.
Discharge Temperature Thermistor
Switch Open Cooling air flow restricted; clean cooler and
check for proper ventilation.
Ambient temperature is too high; provide
sufficient 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.
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 normal, 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.
COMPRESSOR WILL NOT BUILD
UP FULL DISCHARGE PRESSURE Air Demand is Too Great Check service lines for leaks or open valves.
Dirty Air Filter Check the filter indicator and change or clean
element if required.
Pilot Pressure Regulator Out
of Adjustment Adjust regulator according to control
adjustment instructions in the Maintenance
section.
Defective Pilot Pressure Regulator Check diaphragm and replace if necessary
(kit available).
Defective Minimum Pressure Valve Check that the piston is moving freely.
Inlet Valve Not Opening Completely Check and readjust control linkage.
Broken spring in Sullicon Control.
Inlet cylinder not extended.
Defective Closed Inlet Solenoid
Valve Repair or replace.
Defective Closed Inlet Solenoid
Valve Timer Replace.
LINE PRESSURE RISES ABOVE
CUT--OUT PRESSURE SETTING
ON PRESSURE SWITCH Leak in Control System Causing
Loss of Pressure Signals Check for leaks.
Defective Pressure Switch Check that diaphragm and contacts are
functioning properly and are not damaged.
Repair or replace if necessary (kit available).
Defective Pilot Valve Check that Sullicon Control lever is moved to
a completely stroked position when the pres--
sure switch contacts close. Repair or replace
if necessary (kit available).

Sullair 20/12 Series Specifications

General

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