isolate power from the unit, even in the “Unit Off” mode. Some internal components require
and receive power even during the “Unit Off” mode of the Liebert® controller.
WARNING! Arc flash and electric shock hazard. Open all local and remote electric power-supply
disconnect switches, verify with a voltmeter that power is Off and wear appropriate,
OSHA-approved personal protective equipment (PPE) per NFPA 70E before working within the
electric control enclosure. Failure to comply can cause serious injury or death. Customer must
provide earth ground to unit, per NEC, CEC and local codes, as applicable. Before proceeding
with installation, read all instructions, verify that all the parts are included and check the
nameplate to be sure the voltage matches available utility power. The Liebert® controller does
not isolate power from the unit, even in the “Unit Off” mode. Some internal components
require and receive power even during the “Unit Off” mode of the controller. The only way to
ensure that there is NO voltage inside the unit is to install and open a remote disconnect switch.
Refer to unit electrical schematic. Follow all local codes.
WARNING! Risk of electric shock. Can cause equipment damage, injury or death. Open all local
and remote electric power supply disconnect switches and verify with a voltmeter that power is
off before working within any electric connection enclosures. Service and maintenance work
must be performed only by properly trained and qualified personnel and in accordance with
applicable regulations and manufacturers’ specifications. Opening or removing the covers to any
equipment may expose personnel to lethal voltages within the unit even when it is apparently
not operating and the input wiring is disconnected from the electrical source.
WARNING! Do not power on the unit until authorized technical personnel have confirmed that
the unit connections are correct.
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.
WARNING! During the operation of the precision air conditioner, very high voltage may be
present in the equipment. Adhere to all of the notes and warnings marked on the equipment or
contained in this manual, which may otherwise lead to an injury or fatality.
WARNING! Only qualified maintenance personnel can operate and handle the equipment. All
maintenance and operation must follow the local laws, especially the regulations about the
electric power, refrigeration, and production.
WARNING! Risk of contact with high-speed rotating fan blades. Can cause serious injury or
death. Open all local and remote electric power-supply disconnect switches, verify with a
voltmeter that power is off, and verify that all fan blades have stopped rotating before working
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