11 SYSTEM MAINTENANCE
WARNING! Arc flash and electric shock hazard. Open all local and remote unit electric power
disconnect switches, verify with a voltmeter that power is Off and wear protective equipment
per NFPA 70E before working within the electric control enclosure. Failure to comply can cause
injury or death.
Unit contains potentially lethal voltage in some circuits.
WARNING! Risk of electric shock. Can cause serious injury or death.
Open all local and remote unit electric power disconnect switches, wait 10 minutes and verify
with a voltmeter that power is Off before working within the unit electric connection enclosures
or working within the fan speed control and the EC fan enclosures. These devices can retain a
stored high-voltage electrical charge for up to 10 minutes.
Only properly trained and qualified personnel may perform repair, maintenance and cleaning.
WARNING! Risk of contact with high-speed, rotating fan blades. Can cause serious personal
injury or death.
Fan blades can automatically start rotating without warning at any time during a cooling cycle
or after power is restored after a power failure. Open all local and remote electric power supply
disconnect switches, wait 10 minutes and verify with a voltmeter that power is Off before
working within the unit cabinet, removing the fan guards or servicing the fan speed control, fan
blades or EC fan motors.
11.1 General Procedures
NOTE: When ordering replacement parts for equipment, it is necessary to specify unit model number,
serial number and voltage. Please record those numbers in the spaces below.
• Model Number ________________
• Serial Number ________________
• Voltage / Phase / Frequency ________________
Periodic attention is necessary for continued satisfactory operation of your unit. Restricted air flow
through the condenser coil, reduced airflow from non-functioning fans and low refrigerant system charge
levels will reduce the operating efficiency of the unit and can result in high condensing temperatures and
loss of cooling. In winter, do not permit snow to accumulate around the sides or underneath the condenser
coil.
Monthly and semi-annual inspections and maintenance are recommended for proper system operation.
Use copies of Preventive Maintenance Checklist on page123 for each of these inspections.
Vertiv | Liebert® MC™ Installer/User Guide | 109
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