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5.4 Maintenance and Reliability
The Liebert FS is designed to require minimal preventive servicing and maintenance. There are no
user serviceable parts in the Liebert FS. Please contact a Liebert-Certified Technician before attempt-
ing to remove or service any components of the system. No bearings maintenance or replacement is
required over the life of the Liebert FS under normal operation conditions. No vacuum pump mainte-
nance or replacement is required over the life of the Liebert FS under normal operation conditions.
The optional inlet air filter in the cabinet will need to be replaced when it is sufficiently dirty as to
reduce the flow of air into the cabinet. Ambient conditions at the installation site will determine the
frequency of replacement. The Liebert FS Flywheel Module is designed for fifteen-year service life
before first scheduled maintenance. At fifteen years, the vacuum absorbers should be replaced or
regenerated.
The reliability of the Liebert FS power electronics is consistent with UPS power electronics of compa-
rable energy levels. The mechanical assemblies are of higher life and reliability than other commer-
cially available flywheel systems due to the elimination of rolling element bearings and external
vacuum-pumping systems.