GENERAL AIR PRODUCTS, INC.
For Assistance Please Call 1-800 345-8207
Please keep these instructions for future reference.
OILLESSINST
REV 080906
Trouble Shooting Guide
Symptom
Possible Cause(s)
Corrective Action
Motor hums and runs
slowly or not at all
1.
Low voltage or no voltage
2.
Shorted or open motor winding
3.
Defective check valve
4.
Defective pressure switch –
contacts will not close
1.
Check voltage during attempt
to start. Voltage must be
/-10% of nominal
voltage to start motor.
Increase wire size if necessary
to lower voltage drop.
2.
Replace motor
3.
Replace check valve
4.
Repair or replace pressure
switch
Reset mechanism cuts
out repeatedly or fuses
blow repeatedly
1.
Insufficient voltage to motor
2.
Pressure switch set too high
3.
Wrong fuse size
4.
Piping too restrictive
5.
Defective motor
1.
Check voltage during attempt
to start. Voltage must be
/-10% of nominal
voltage to start motor.
Increase wire size if necessary
to lower voltage drop.
2.
Consult factory, adjust or
replace
3.
Be sure fuses and heaters are
rated properly
4.
Add receiver vessel or
increase pipe volume after
compressor.
5.
Replace motor
Unit short cycles
repeatedly
1. Piping too restrictive
2. Leak in line before system check
valve
1.
Add receiver vessel or
increase pipe volume after
compressor.
2.
Repair leaks(s)
Compressor
Overheating
1. Dirty intake filter
2. Wrong motor rotation
3. Air flow to fan on flywheel blocked
1. Clean intake filter
2. Correct rotation
3. Clear air flow to fan or relocate
unit
Excessive noise in
operation
1.
Damaged bearings
2.
Worn piston rings or skirts
3.
Broken valves
4.
Loose blower wheel
5.
Damaged Blower baffle
1. Contact General Air Products,
Inc. Service Department.
1-(800)345-8207
System pressure
builds slowly
1.
Compressor sized incorrectly
2.
Leaks or restrictions in piping
3.
Dirty intake filter
4.
Blown head gasket
1.
Check system size and
compressor sizing
2.
Correct leaks and remove
restrictions
3.
Clean intake filter
4.
Replace head gasket
