Emerson 3000 用户手册

This manual contains important safety instructions that should be followed during the installation 

and maintenance of the Liebert Challenger 3000. 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 and installation, operating and safety instructions on the unit and in 

this manual. Follow all operating and user instructions.

Arc flash and electric shock hazard. Disconnect all local and remote electric power supplies 

and wear protective equipment per NFPA 70E before working within the electrical enclosure. 

Failure to comply can cause 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 factory-supplied optional 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 and check the internal power with a voltmeter. Refer to unit electrical 

schematic.
Follow all local codes.

Risk of explosive discharge from high-pressure refrigerant. Can cause injury or death.
This unit contains fluids and/or gases under high pressure.
Relieve pressure before working with piping.

Risk of refrigerant system rupture or explosion from overpressurization. Can cause 

equipment damage, injury or death.
Local building or plumbing codes may require that a fusible plug or other type of pressure 

relief device be installed in the system.
For systems requiring EU CE compliance (50Hz), the system installer must provide and 

install a discharge pressure relief valve rated for a maximum of 500psig (34bar) in the high 

side refrigerant circuit. Do not install a shutoff valve between the compressor and the 

field-installed relief valve. The pressure relief valve must be CE certified to the EU Pressure 

Equipment Directive by an EU “Notified Body.”

NOTE
The Liebert indoor cooling unit has a factory-installed high-pressure safety switch in the high