Liebert Precision Cooling System DS - Manual (Page 78)

Electrical Connections
68
7.0 E
LECTRICAL
C
ONNECTIONS
Three-phase electrical service is required for all models. Electrical service must conform to national
and local electrical codes. Refer to equipment nameplate regarding wire size and circuit protection
requirements. Refer to electrical schematic when making connections. Refer to Figure 55 for electri-
cal service entrances into unit.
A manual electrical disconnect switch should be installed in accordance with local codes and distribu-
tion system. Consult local codes for external disconnect requirements.
!
WARNING
Risk of electric shock. Can cause injury or death.
Disconnect local and remote power supplies before working within.
Use voltmeter to make sure power is turned off before making any electrical connections.
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.
50Hz Models Only: Re-install all terminal covers before connecting power to the unit.
Failure to install these covers exposes high-voltage terminals.
Follow all local codes.
!
WARNING
Risk of improper wiring, piping, moving, lifting and handling. Can cause equipment damage,
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.
!
CAUTION
Risk of backward compressor rotation. Can cause equipment damage.
Three-phase power must be connected to the unit line voltage terminals in the proper
sequence so that scroll compressors rotate in the proper direction.
!
CAUTION
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.
!
CAUTION
Risk of overheated terminals. Can cause wiring and component damage.
Use copper wiring only. Make sure that all connections are tight.