Sullair LS-32 Operator's Manual And Parts List page 54

Section 7
MAINTENANCE
7.9 TROUBLESHOOTING GUIDE (CONTINUED)
SYMPTOM
COMPRESSOR SHUTS DOWN
WITH AIR DEMAND PRESENT
(CONTINUED)
COMPRESSOR WILL NOT BUILD
UP FULL DISCHARGE PRESSURE
48
PROBABLE CAUSE
Excessive Operating Pressure (Cont.)
HIGH TEMP T1 or T3 Message Displayed
Low Fluid Pressure
(LOW PRESSURE P3 display)
Low Water Pressure
(FAN OL/LOW WATER display)
Air Demand is Too Great
Dirty Air Filter
REMEDY
Defective blowdown valve; blowdown valve
should exhaust sump pressure to 30 psig (2.1 bar)
for integrated coolers; 50 psig (3.4 bar) for remote
coolers when maximum operating pressure is
reached. Repair if defective.
Open or shorted P1, P2, P3 or P4 sender mes-
sage; replace sender indicated.
Operating lever of inlet butterfly valve is loose on
valve shaft. Reposition the valve plate and tighten
lever set screw.
Cooling water temperature too high; increase
water flow (water-cooled only).
Cooling water flow insufficient; check water lines,
valves (water-cooled only) and available water
pressure differential.
Cooler plugged; clean tubes. If plugging persists,
install water conditioner or water filter(water-
cooled only).
Cooling air flow restricted; clean cooler and check
for proper ventilation.
Ambient temperature is too high; provide suffi-
cient ventilation.
Cooling air ductwork, if installed, may restrict air
flow. High static fan must be specified with cus-
tomer-supplied ductwork, and ductwork must be
sized to minimize flow restriction.
Low fluid level; add fluid.
Clogged filter; change the fluid filter element as
indicated by Supervisor control.
Thermal valve not functioning properly; replace
element (air-cooled only).
Optional Water flow regulating valve not function-
ing properly; change (water-cooled only).
Open or shorted T1 or T2 sender; check for a
short or open circuit to probe and correct wiring.
Excessive pressure drop in supply and return
lines of remote air-cooled cooling package.
Consult paragraph 4.6 of this manual.
Check fluid level.
Check for clogged fluid filter.
Check the cooling fan motor or water flow sys-
tem.
Check service lines for leaks or open valves.
Check for filter maintenance message on supervi-
sor panel and change or clean element if
required.