Sterlco GC Series Central Chiller - Manual (Page 42)

GC Series Central Chillers Chapter 5: Maintenance 42 of 79
Chapter 5: Maintenance
5-1 Lubrication
Grease all fan motors, and pump motors that do not have permanently sealed bearings. Be
sure to use an all-purpose industrial grease with a temperature reference of 185˚ F (85˚ C).
Remove the grease relief plug (motors only) before adding grease, add grease until a small
amount pours out, and replace the plug when finished.
Caution! Failure to remove the grease relief plug will result in dislodging the bearing
grease seal, eventually causing bearing failure.
Refrigeration compressors are hermetically sealed and no lubrication is required.
5-2 Filter Cleaning
Air filter cleaning is important to keep your air-cooled central chiller operating at peak
efficiency and capacity. Clean the filters whenever they appear dirty, or at regularly
scheduled intervals.
1. Turn the chiller off.
2. Remove the top side panel(s) to expose the condenser section.
3. Slide the filter rod to release it from the frame at the top and bottom.
4. Wash down the filter with clean water (preferably with a garden hose), directing the flow
of water opposite the direction of airflow. If dirt is heavy, use a mild detergent and rinse
well. Allow the filter to dry completely before replacing it on the chiller.
Note: Keep a spare air filter set on hand. Install and use it while cleaning).
Caution! Do not use compressed air to blow off a dirty filter. It will not clean very well,
and the filter could be damaged. Never run the chiller without properly
installed filters.
5-3 Maintaining the Condenser
Dirty condenser heat exchange surfaces reduce system capacity and efficiency.
Air- and Remote Air-Cooled Chillers
Brush or vacuum light dirt accumulations off the aluminum condenser fins. Avoid bending or
damaging them. Heavy dirt accumulations on the fins may require professional cleaning.
Water-Cooled Chillers
Proper water treatment will greatly reduce cleaning intervals.
Shell & Tube Condensers ( GCWC70-210 ) . Remove dirt and slime in the condenser tube
water side by cleaning with a nylon tube brush. Remove mineral deposits by reverse
circulating Liquid Inhibited Acid De-Scaling Solution (Part No. 216.00017.00) through the
tube water side of the condenser. Follow the directions on the container.
The refrigerant side is sealed and requires no routine maintenance.
Caution! Do not use steam or water over 140ºF (60ºC) to clean a condenser unless you
are monitoring the refrigeration module for excessive pressure with gauges.
Only a trained technician should use this method.