Product Manual

17
Scroll Air Compressors Tankmount/Basemount
Troubleshooting Guide
PROBLEM CAUSE CORRECTIVE ACTION
Compressor unit will not start 1. Main disconnect is not ON
2. Blown fuse or circuit breaker at
customer provided power supply
3. Blown fuse at primary side of
transformer (Duplex models)
4. Pressure switch is in OPEN position
1. Switch disconnect to ON
2. Inspect for any fault replace fuse or trip
disconnect to ON
3. Replace fuse on primary side be sure use same
type and size
4. Reduce pressure in tank
Power is at supply connection
and compressor will not start
1. Blown fuse on secondary side of
transformer (Duplex models)
2. Motor overload has tripped
3. Wrong or low voltage
4. Starter has failed
5. Motor has failed
1. Replace fuse on secondary side be sure use
same typeand size
2. See last entry of Troubleshooting Guide
3. Check incoming power supply and unit power
rating
4. Replace contactor assembly
5. Replace motor
Compressor is running but will
not make pressure
1. Drive belts came off or too loose
2. Clogged intake fi lter element
3. Pressure relief valve has opened
4. Excessive tip seal wear
5. Electric tank drain is open continuously
6. Unit running in the wrong direction
7. Discharge air is leaking
1. Replace drive belts and (or) tighten
2. Replace intake fi lter element
3. Pressure switch needs replaced or starter
contacts welded shut
4. Replace tip seals
5. Clean/replace tank drain
6. Correct power connections
7. Check discharge piping
Excessive noise or vibration 1. Drive belt has separated or fl at spot
2. Motor has failed
3. Pump is damaged
4. Cooling air fan is touching fan guard
1. Replace drive belt
2. Replace motor
3. Fix or replace pump
4. Check air fan daily
Compressor running hot 1. Room temperature is above 104° F
2. Inlet air duct is obstructed
3. Pump running at high pressure
4. Aftercooler fi ns clogged
5. Intake fi lter damaged
6. Compressor is dirty
1. Add ventilation or air conditioning to room
2. Remove obstruction or reposition unit to allow
for cooling air
3. Confi rm tank pressure and pump outlet are
not obstructed
4. Clean aftercooler
5. Check intake fi lter
6. Clean unit
Compressor turns on / off
rapidly
1. Receiver tank has high level of water
2. Compressor check valve has failed
3. Defective pressure switch
1. Replace electric tank drain / drain tank
2. Replace check valve
3. Replace pressure switch
Safety valve blows off 1. Pressure switch has failed to open
2. Motor starter contacts welded shut
1. Replace pressure switch
2. Replace motor starter
Motor Overload has tripped 1. Pump has failed
2. Motor has failed
3. Improper wiring
4. Wrong overload setting
5. Low voltage
1. Fix or replace pump
2. Replace motor
3. Check wiring
4. Check overload setting
5. Check incoming power supply