Section 8
TROUBLESHOOTING
30
COMPRESSOR SHUTS
DOWN WITH AIR
DEMAND PRESENT
(CONTINUED)
COMPRESSOR WILL NOT
BUILD UP FULL DIS-
CHARGE PRESSURE
LINE PRESSURE RISES
ABOVE CUT-OUT PRES-
SURE SETTING ON
PRESSURE SWITCH
Discharge Temperature Switch Open
(Continued)
Low Fluid Pressure
Low Water Pressure
Air Demand is Too Great
Dirty Air Filter
Pressure Regulators Out of
Adjustment
Defective Pressure Regulator
Leak in Control System Causing Loss
of Pressure Signals
Defective Pressure Switch
Defective Solenoid Valve
Defective Blowdown Valve
High Pressure Shutdown is Defective
or Adjustment is Incorrect
Cooler plugged; 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 suffi-
cient ventilation.
Low fluid level; add fluid.
Clogged filter; inspect the fluid filter element
and/or change the fluid filter element if mainte-
nance indicator is showing red.
Thermal valve not functioning properly; change
(air-cooled only).
Water flow regulating valve not functioning prop-
erly; change (water-cooled only).
Defective discharge temperature switch; check
for a short or open circuit to probe and correct
wiring.
Check the fluid stop valve to be sure it is opening
properly on start-up of compressor.
Check service lines for leaks or open valves.
Check the filter indicator and change element if
required.
Adjust regulators for spiral valve and inlet butter-
fly valve according to control adjustment instruc-
tions in the Maintenance Section.
Check diaphragm and replace if necessary (kit
available).
Check for leaks.
Check that diaphragm and contacts are
functioning properly and are not damaged.
Replace if necessary.
Check that Sullicon Control lever might have
moved to unload stop when the pressure switch
contacts open. Repair or replace if necessary
(kit available).
Check that sump pressure is exhausted to the
atmosphere when the pressure switch contacts
open; repair or replace if necessary (kit avail-
able).
Re-adjust or replace.
8.2 TROUBLESHOOTING GUIDE (CONTINUED)
SYMPTOM PROBABLE CAUSE REMEDY
Continued ...
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