Vertiv Liebert DSE, System Design And User Manual, Page: 35 / 120

WARNING! Risk of wiring damage, short circuits and electric shock. Can cause overheated
wiring, smoke, fire, activation of fire suppression systems and EMS personnel and equipment,
building and equipment damage, injury or death. Insert CSA certified or UL listed bushings into
holes and or knockouts used to route wiring through metal panels to protect the wire
insulation from contact with sheet metal edges.
NOTICE
Risk of improper electrical connection of three-phase input power. Can cause backward
compressor rotation and unit damage. Service technicians should use a gauge set on the
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 in the proper
sequence so that the compressors rotate in the proper direction. Incoming power must be
properly phased to prevent compressors from running backward. We recommend checking
the unit’s phasing with proper instrumentation to ensure that power connections were made
correctly. We also recommend verifying discharge and suction pressures during start up to
ensure that the compressors are running in the correct direction.
NOTICE
Risk of improper electrical supply connection. Can cause equipment damage. See transformer
label for primary tap connections. Installer will need to change transformer primary taps if
applied unit voltage is other than pre-wired tap voltage.
NOTE: Seal openings around piping and electrical connection to prevent air leakage. Failure to do so
could reduce the unit’s cooling performance.
7 Electrical Requirements 35