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28 TRG-TRC012-EN
notes
period four
Maintenance Considerations
Some helical-rotary compressor designs do require periodic maintenance of
mechanical system components. This includes oil and refrigerant filter changes,
oil strainer changes, and a compressor rotor inspection.
Open-motor compressor designs require shaft alignment, coupling inspection,
bearing lubrication, and cleaning of the motor windings, rotor ends, and fan
blades on a quarterly or annual basis.
In all cases, strictly follow the manufacturer’s published maintenance
requirements and recommendations.
Optimum performance of heat transfer components depends on keeping the
heat transfer surfaces free from scale and sludge. Even a very thin deposit of
scale can substantially reduce heat transfer capacity. Owners of water-cooled
chillers should engage the services of a qualified water treatment specialist to
▲ Other design-specific requirements:
◆ Change oil when oil analysis dictates
◆ Replace oil filter periodically
◆ Replace filter drier periodically
◆ Clean oil strainers annually
◆ Check shaft alignment annually
◆ Check coupling annually
◆ Replace shaft seal every 2 to 4 years
◆ Compressor teardown inspection every 5 to 10 years
maintenance considerations
Mechanical Components
Figure 41
maintenance considerations
Heat Transfer Surfaces
▲ Recommended maintenance
◆ Use a qualified water treatment
specialist
◆ Clean condenser tubes as
needed (water-cooled)
◆ Clean water-side strainers
◆ Test tubes every 3 years
◆ Clean condenser coils as
needed (air-cooled)
Figure 42