Advantage BG-N4 Series, Instruction Manual

Page: 42 / 76

BG-N4 Glycol Chiller
Page: 42
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: 317-881-1277
Service Department Fax: 317-885-8683
Email: service@AdvantageEngineering.com
4.1 UNIT WILL NOT START
A. Power off. Check main disconnect.
B. Main line open. Check fuses.
C. Loose terminals. Tighten terminals with POWER OFF.
D. Control circuit open. Check control voltage fuses and transformer.
4.2 COMPRESSOR HUMS BUT WILL NOT START
A. Contactor problem. Check contacts and contactor operation.
B. Low voltage. Check voltage at main and at the unit. If voltage is OK at the main but low
at the unit, increase wire size. If low at main, consult your local power company. Voltage
must be +/- 10% nameplate rating.
C. No power on one phase of a three phase unit. Check fuses in control panel and main
disconnect. Also check unit wiring, main plant fuse and wiring. If the problem is with the
main power supply coming into the plant, call the local power company.
D. Loose terminals. Power off and follow all company lock-out tag-out procedure before
tightening terminals.
4.3 SHUTS OFF ON HIGH PRESSURE LIMIT
A. Air-cooled units:
1. Insufficient condenser air flow. Check condenser filter for dirt, fins may be
plugged with dirt or foreign material. Also, check for proper fan rotation.
Note: All enclosure panels must be attached.
2. Fan motor not operating. Have electrician check fuses and wiring, motor starter
and overloads, and motor. Repair or replace motor if defective.
B. Improperly set high pressure control. Have refrigeration serviceman adjust pressure
setting in control instrument as directed by factory service.
WARNING: Before troubleshooting or servicing this unit, follow all company lock-out tag-out
procedures.