Vertiv Liebert CW, Installer/User Manual, Page: 7 / 76

WARNING! Risk of improper wire sizing/rating and loose electrical connections. Can cause
overheated wire and electrical connection terminals resulting in smoke, fire, equipment and
building damage, injury or death. Use correctly sized copper wire only and verify that all
electrical connections are tight before turning power On. Check all electrical connections
periodically and tighten as necessary.
CAUTION: Risk of contact with sharp edges, splinters, and exposed fasteners. Can cause
injury. Only properly trained and qualified personnel wearing appropriate, OSHA-approved PPE
should attempt to move, lift, remove packaging from or prepare the unit for installation.
CAUTION: Risk of exposure to harmful noise levels. Can cause hearing injury or loss.
Depending on the installation and operating conditions, a sound pressure level greater than
70 dB(A) may arise. Take appropriate technical safety measures. Operating personnel must
wear appropriate, OSHA-approved PPE and observe all appropriate hearing-protection safety
requirements.
CAUTION: Risk of contact with hot surfaces. Can cause injury. The fan motor, and some
electrical components are extremely hot during unit operation. Allow sufficient time for them to
cool to a touch-safe temperature before working within the unit cabinet. Use extreme caution
and wear appropriate, OSHA-approved PPE when working on or near hot components.
CAUTION: Risk of smoke generation. Can cause fire suppression and alarm system activation,
resulting in injury during building evacuation and mobilization of emergency fire and rescue
services. Start-up operation of optional electric reheat elements can create smoke or fumes
that can activate the facility alarm and fire suppression system. Prepare and take appropriate
steps to manage this possibility. Before beginning initial start-up checks, make certain that unit
was installed according to the instructions in this manual. All exterior panels must be in place.
NOTICE
Risk of improper power-supply connection. Can cause equipment damage and loss of warranty
coverage.
Prior to connecting any equipment to a main or alternate power source (for example: back-up
generator systems) for start-up, commissioning, testing, or normal operation, ensure that these
sources are correctly adjusted to the nameplate voltage and frequency of all equipment to be
connected. In general, power-source voltages should be stabilized and regulated to within
±10% of the load nameplate nominal voltage. Also, ensure that no three-phase sources are
single-phased at any time.
Important Safety Instructions
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