Gardner Denver EBB BB-7.5 HP Operating And Service Manual page 74

TROUBLE SHOOTING GUIDE FOR OPTIONAL INTEGRATED DRYER
SYMPTOM
Dryer not running
Motor Run light is on
Dryer not running
Motor Run light is off.
High discharge pressure
(above335 psig)
POSSIBLE CAUSE
1. Low voltage to the dryer.
2. Contactor not pulling in.
3. Compressor overload open
4. Defective compressor start
components.
5. Compressor windings open.
1. Switch not turned on.
2. No power.
3. Circuit breaker or fuse.
4. Improperly wired.
5. Defective Start or Stop switch.
1. Fan not operating.
2. Dirty or blocked condensor.
3. High ambient conditions.
4. Excessive air load exceeding
the capacity of the dryer.
13–8–612 Page 64
REMEDY
1. Verify proper line voltage to unit
2. Check all safeties, verify con–
trol voltage, check coil continuity.
3. Verify that compressor is not
grounded or shorted phase to
phase, verify proper refrigerant
charge in unit, verify proper
ambient temperature conditions
(40 to 110 F.).
4. Verify that capacitors and voltage
relays are functioning properly.
5. Verify that overload is functioning
properly by checking continuity,
read windings for continuity.
1. Check switch.
2. Verify proper line voltage to unit.
3. Check circuit breakers and fuses.
Ascertain cause of fuse failure
before trying to restart.
4. Check wiring against wiring
diagram.
5. Check switches for continuity.
1. Check fan motor. Check fan
cycling control for proper operation.
2. Maintain clearances around the unit
as specified in the manual. Inspect
condensor for dirt and debris.
3. Verify ambient conditions as
specified in the manual.
4. Verify proper flow and load at dryer
inlet.