Gardner Denver EBB BB-7.5 HP, Operating And Service Manual

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