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32 TRG-TRC010-EN
notes
period four
Maintenance Considerations
The compressor/motor assembly in direct-drive, hermetic compressor designs
requires little periodic maintenance. The hermetic motor eliminates the need
for external shaft seals associated with open motors. (These seals are a prime
source of oil and refrigerant leaks and should be inspected on a regular basis.)
Hermetic motor designs also eliminate the annual coupling and seal
inspections, alignment, and shaft seal replacement associated with open
motors.
With the advent of microprocessor-based controls, the control panel and
auxiliary controllers require no recalibration or maintenance. Remotely-
mounted electronic sensors send information to the unit controller, which can
be connected to a building automation system to communicate information
and allow system-level optimization. These systems can notify the operator
with an alarm or diagnostic message when a problem occurs.
As for any mechanical equipment, a daily visual inspection of the chiller is
recommended to look for oil leaks, condensation, loosened electrical or control
wiring, or signs of corrosion. Special attention should be given to safety
controls and electrical components.
A qualified service technician should check the chiller annually for leaks. The
United States Environmental Protection Agency (EPA) mandates refrigerant
recovery whenever a refrigeration circuit is opened during the normal service of
any air conditioning system.
maintenance considerations
Mechanical Components
▲ Required maintenance
◆ Compressor and motor: no maintenance required
◆ Controls: no maintenance or calibration required
▲ Recommended maintenance
◆ Visually inspect overall unit
◆ Inspect safety controls and electrical components
◆ Tighten electrical connections
◆ Check for leaks
Figure 46
trgtrc010_book.book Page 32 Wednesday, September 1, 1999 10:42 AM