Section 6
MAINTENANCE
36
6.8 TROUBLESHOOTING GUIDE
SYMPTOM PROBABLE CAUSE REMEDY
VACUUM UNIT 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.
VACUUM UNIT SHUTS
DOWN WITH VACUUM
DEMAND PRESENT
Loss of Control Voltage Check for loose wires.
Replace control transformer fuse.
Low Incoming Voltage Consult power company.
Excessive Vacuum Unit Discharge
Pressure
Defect in pressure switch; check pressure
at which contact points open.
Separator requires maintenance; check
maintenance indicator under full load
conditions.
High pressure shutdown switch is adjusted
too low; readjust to 12 psig (83kPa).
Blockage or valve closed on discharge line.
Discharge line pipe size too small.
Discharge Temperature Switch
Open
Cooling air flow restricted; clean cooler and
check for proper ventilation.
Continued...
ating vacuum except for the stated vacuum.
The vacuum regulator should be adjusted for the
vacuum at which modulation of gas delivery should
begin. In this case, the vacuum will be 20 in-Hg.
(508mm). The regulator is adjusted by loosening
the jam nut on the end of the cone shaped spring
cover of the vacuum regulator. When the jam nut is
loose, turn the adjusting screw clockwise to
increase or counterclockwise to decrease the set-
ting. Above 20 in-Hg. (508mm), the regulator will
allow atmospheric pressure to flow into the control
chamber of the Sullicon Control. At this time, the
Sullicon Control lever should start to move. If the
vacuum unit is equipped with the optional dual con-
trol, the vacuum switch contacts should open at 23
in-Hg. (584mm) and re-close at 20 in-Hg. (508mm).
6.7 TROUBLESHOOTING INTRODUCTION
The information contained in Section 6.8,
Troubleshooting Guide has been compiled from
field report data and factory experience. It contains
symptoms and usual causes for the described prob-
lems. However, DO NOT assume that these are
the only problems that may occur. All available data
concerning the trouble should be systematically
analyzed before undertaking any repairs or compo-
nent replacement procedures.
A detailed visual inspection is worth performing for
almost all problems and may avoid unnecessary
additional damage to the compressor.
• Check for loose wiring.
• Check for damaged piping.
• Check for parts damaged by heat or an elec-
trical short circuit, usually apparent by dis-
coloration or a burnt odor.
Should your problem persist after making the rec-
ommended check, consult your nearest Sullair rep-
resentative or the Sullair Corporation factory.
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