1 IMPORTANT SAFETY INSTRUCTIONS
Save These Instructions
This manual contains important safety instructions that should be followed during the installation and
maintenance of the Liebert XDC. Read this manual thoroughly before attempting to install or operate this
unit.
Only qualified personnel should move, install or service this equipment.
Adhere to all warnings, cautions, notices and installation, operating and safety instructions on the unit
and in this manual. Follow all operating and user instructions.
Follow all local codes.
WARNING! Risk of arc flash and electric shock. Can cause equipment damage or death.
Disconnect all local and remote electric power supplies and wear protective equipment per
NFPA 70E before working within 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 iCOM microprocessor 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
Liebert iCOM control.
The line side of the disconnect switch on the front of the unit 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 unit falling over. Can cause equipment damage, injury and death.
The Liebert XDC is top-heavy. Use extreme caution and care when moving and installing this
unit.
WARNING! Risk of refrigerant system explosion or rupture from overpressurization. Can cause
equipment damage, injury and death.
Installer must install a 400 psig pressure relief valve in each of the two R-407C refrigerant
circuits of the Liebert XDC system. Do not install shutoff valves between the compressors and
the pressure relief valves.
For systems requiring EU CE compliance, the pressure relief valves must be CE-certified by a
notified body to the EU Pressure Equipment Directive.
CAUTION: Risk of piping and component rupture. Can cause equipment damage and injury.
Closing service valves may isolate liquid refrigerant, causing high pressure and rupture of
piping. Do not close valves without following recommended procedures for repair, maintenance
and replacement of components. Install pressure relief valves in field piping that may become
isolated by service valves.
Vertiv | Liebert® XDC™ User Manual | 5
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