WARNING! Risk of electric shock. Can cause serious injury or death. 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 the Liebert® iCOM™ control. Open all local and remote electric
power disconnect switches and verify with a voltmeter that power is Off before working on any component of
the system.
WARNING! Risk of electric shock. Can cause serious injury or death. Open all local and remote electric power
supply disconnect switches and verify with a voltmeter that power is off before opening the fan motor
electric connection enclosure. Use only fully trained and qualified HVAC technicians to replace or perform
maintenance on the EC fans.
WARNING! Risk of over-pressurization of the refrigeration system. Can cause explosive discharge of high
pressure refrigerant, loss of refrigerant, environmental pollution, equipment damage, injury or death. This
unit contains fluids and gases under high pressure. Use extreme caution when charging the refrigerant
system. Do not pressurize the system higher than the design pressure marked on the unit's nameplate.
WARNING! Risk of very heavy 350 lb. (56.7kg) fan modules dropping downward suddenly. Can cause injury or
death. Support fan modules before removing mounting hardware. Use caution to keep body parts out of the
fan modules pathway during repositioning. Only properly trained and qualified personnel should work on
this equipment.
WARNING! Risk of improper moving. Can cause equipment damage, injury or death. Use only lifting
equipment that is rated for the unit weight by an OSHA-certified rating organization. The center of gravity
varies depending on the unit size and selected options. The slings must be equally spaced on either side of
the center of gravity indicator. Unit weights are listed in Shipping Dimensions and Unit Weights.
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 in the unit cabinet or on the fan assembly. If
control voltage is applied, the fan motor can restart without warning after a power failure. Do not operate the
unit with any or all cabinet panels removed.
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.
Vertiv | Liebert® DSE Thermal Management System Installer/User Guide
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