6 ELECTRICAL CONNECTIONS
Line-voltage 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 the appropriate submittal drawing, listed in Table 6.1 on the next page, for electrical
service entrances into unit.
A manual electrical disconnect switch should be installed in accordance with local codes and distribution system. Consult
local codes for external disconnect requirements.
All internal wiring is completed at the factory.
WARNING! Arc flash and electric shock hazard. Open all local and remote electric power-supply disconnect
switches, verify with a voltmeter that power is Off and wear appropriate, OSHA-approved personal protective
equipment (PPE) per NFPA 70E before working within the 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® controller 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 controller. The factory-supplied 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. Refer to unit electrical schematic. Follow all
local codes.
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.
WARNING! Risk of improper wire sizing/rating and loose electrical connections. Can cause overheated wire
and electrical connection terminals resulting in smoke, fire, equipment and building damage, injury or death.
Use correctly sized copper wire only and verify that all electrical connections are tight before turning power
On. Check all electrical connections periodically and tighten as necessary.
NOTICE
Risk of improper power-supply connection. Can cause equipment damage and loss of warranty coverage.
Prior to connecting any equipment to a main or alternate power source (for example: back-up generator
systems) for start-up, commissioning, testing, or normal operation, ensure that these sources are correctly
adjusted to the nameplate voltage and frequency of all equipment to be connected. In general, power-source
voltages should be stabilized and regulated to within ±10% of the load nameplate nominal voltage. Also, ensure
that no three-phase sources are single-phased at any time.
NOTE: Use copper wiring only. Make sure that all connections are tightened to the proper torque mentioned on the
component.
6 Electrical Connections
39
To Next Page
Loading...
