AEC NEC Central Station Air and Water Cooled Chiller - Manual (Page 46)

NEC Series Water- and Air-Cooled Central Chillers Page 45
7 Routine Maintenance
7-1 Lubrication
Grease all fan bearings, fan motors, and pump motors that do not have permanently sealed
bearings. Remove the grease relief plug (motors only) before adding grease. Failure to do so may
dislodge the bearing grease retainer which will eventually cause bearing failure.
Lubricate every three (3) months or as the manufacturer requires.
Compressors are hermetically sealed and no oiling is required.
7-2 Condenser Maintenance
Dirty condenser heat exchange surfaces reduce system capacity. Inspect and clean as needed.
Air-Cooled Chillers
Brush or vacuum light dirt accumulations. Avoid bending or damaging the fins. Heavy soil
accumulations on the coil require professional steam cleaning by a qualified refrigeration service
technician. Washing from the outside will only make matters worse.
Water-Cooled Chillers
Proper water treatment will greatly reduce cleaning intervals.
Remove dirt in the condenser tubes with a nylon tube brush. Mineral deposits can be removed by
circulating AEC Liquid De-Scaling Solution (AEC Model Number A00502600) through the
water side of the condenser. Follow the directions on the container.
The refrigerant side is sealed and requires no routine maintenance.