Sullair 12 Series User Manual

Section 6
MAINTENANCE
33
TROUBLESHOOTING (continued)
SYMPTOM PROBABLE CAUSE REMEDY
Compressor shuts down with
air demand present (Continued) Discharge temperature switch open Clogged filter; change the fluid filter element
(conttinued) and change the bearing filter element if
maintenance indicator shows red.
Thermal valve not functioning properly;
replace element (air-cooled only).
Water flow regulating valve not functioning
properly; change (water-cooled only).
Defective discharge temperature switch;
check for a short or open circuit to probe
and correct wiring.
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.
Pressure regulator out of adjustment Adjust regulator according to control
adjustment instructions in the Maintenance
section.
Defective pressure regulator Check diaphragm and replace if necessary
(kit available).
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 not
damaged. Replace if necessary.
Defective pilot valve. Check that Sullicon Control lever is moved to
unload, stop when the pressure switch
contacts open. Repair or replace it if neces-
sary (kit available).
Defective blowdown valve. Check that sump pressure is exhausted to
the atmosphere when the pressure switch
contacts open. Repair or replace if neces-
sary (kit available).
High pressure shutdown switch is
defective or incorrectly adjusted Readjust or replace.
Excessive compressor fluid
consumption Clogged return line or orifice Clean strainer (screen and o-ring replace-
ment kit available).
Clean orifice.
Separator element damaged or
not functioning properly Change separator.
Leak in the lubrication system Check all pipes, connections and compo-
nents.
Excess fluid foaming Drain and change.
Fluid level too high
Pressure relief valve open
repeatedly High pressure shutdown switch is
defective or out of adjustment
(135 PSIG [932kPa]). Readjust below pressure relief valve setting
(175 PSIG [1206kPa]).
Defective pressure relief valve Replace.
Plugged separator differential Check separator differential.

Sullair 12 Series Specifications

General

Brand	Sullair
Model	12 Series
Category	Air Compressor
Language	English