Vertiv Liebert CW 038, Installer And User Manual

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8 INITIAL START-UP CHECKS AND COMMISSIONING PROCEDURE
FOR WARRANTY INSPECTION
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 factory-supplied
disconnect switch is inside the unit. The line side of this switch contains live high-voltage. 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 improper wiring, piping, moving, lifting and handling. Can cause equipment
damage, serious injury or death. Installation and service of this equipment should be done only
by qualified personnel who have been specially-trained in the installation of air-conditioning
equipment and who are wearing appropriate, OSHA-approved PPE.
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. Activating reheat during initial start-up may burn off
particulates from electric reheat elements. 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 electrical connectionof three-phase input power. Cancause backward pump rotationand unit
damage. Service technicians should use a gauge set onthe system during the initial start up to verify that the
three-phase power is connected properly. Three-phase power must be connected to the unit line voltage
terminals inthe proper sequence so that the pump rotates inthe proper direction. Incoming power must be
properly phased to prevent pump from running backward. We recommend checking the unit’s phasing with
proper instrumentationto ensure that power connections were made correctly. We also recommend verifying
discharge and suctionpressures during start up to ensure that the pumps are running inthe correct direction.
8Initial Start-up Checks and Commissioning ProcedureFor Warranty Inspection
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