Section 7
MAINTENANCE
45
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.
Supervisor Panel Fuse is Blown Replace fuse.
Replace Supervisor controller if no d isplay
or erratic display.
COMPRESSOR SHUTS DOWN
WITH AIR DEMAND PRESENT Loss of Control Voltage Check incoming power.
Check control fuses and wiring.
Low Incoming Voltage Consult power company. The Sullair
Supervisor will provide indication of most
maintenance problems if control power has
not been lost. Shutdowns will occur upon a
faulty condition or a bad sender condition.
Excessive Operating Pressure Check maximum P2 pressure setting.
HIGH PRESS P1 display; Max P1 pressure
may be set too low. C onsult factory for
recalibration.
Defective solenoid valve; solenoid valve
should cause Sullicon Control lever to move
to unload stop when the unload pressure
setting P2A is exceeded. Repair if
defective.
Defective blowdown valve; blowdown valve
should exhaust sump pressure to 30 to 50
psig (2.1 to 3.4 bar) when maximum
operating pressure is reached. Repair if
defective.
Open or shorted P1, P2, P3 or P4 sender
message; replace sender indicated.
Operating lever of inlet butterfly valve is
loose on valve shaft. Reposition the valve
plate and tighten lever set screw.
HIGH TEMP T1 or T3 Message Cooling water temperature too high;
Displayed 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
(water---cooled only).
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 as indicated by Supervisor control.
Thermal valve not functioning properly;
replace element (air---cooled only) .
Water flow regulating valve not functioning
properly; change (water---cooled only).
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