Liebert Mini-Mate2, 8 Ton - Emerson Network Power
Liebert Mini-Mate2, 8 Ton - Emerson Network Power
Liebert Mini-Mate2, 8 Ton - Emerson Network Power
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
17<br />
Site Preparation and Installation<br />
2.4.4 Electrical Connections, Evaporator or Chilled-Water Unit<br />
! WARNING<br />
Unit contains hazardous electrical voltage. Disconnect power supply before working<br />
within. Line side of factory disconnect remains energized when disconnect is off.<br />
! WARNING<br />
UNIT CONTAINS HAZARDOUS ELECTRICAL VOLTAGE. More than one disconnect<br />
may be required to remove power. Evaporator and condensing units may have separate<br />
disconnects. Open all disconnects before working within.<br />
Each unit is shipped from the factory with internal wiring completed. Refer to electrical schematic,<br />
Figure 11, Figure 25, and Figure 26 when making connections. Electrical connections<br />
to be made at the installation site are:<br />
• <strong>Power</strong> supply to each ceiling unit and control wiring between the evaporator unit and the condensing<br />
unit, if applicable.<br />
• Control wiring between the control panel (wallbox) and the evaporator or chilled-water unit<br />
control board.<br />
<strong>Power</strong> Connections<br />
All power and control wiring and ground connections must be in accordance with the National<br />
Electrical Code (NEC) and local codes. Refer to Unit serial tag data for electrical requirements.<br />
! CAUTION<br />
Use copper wiring only. Make sure that all connections are tight.<br />
Voltage supplied must agree with the voltage specified on the unit serial tag. A field supplied disconnect<br />
switch may be required. Consult local code.<br />
Route the electrical service conduit through the hole provided in the cabinet and terminate it at<br />
the electric box. Make connections at the factory terminal block or disconnect switch, L1, L2, L3.<br />
Connect earth ground to lug provided. See transformer label for primary tap connections.<br />
Installer will need to change transformer primary taps if applied unit voltage is other than prewired<br />
tap voltage.<br />
An optional single point power kit is available for units that are close coupled (refer to Figure 11<br />
and 2.4.3 - Piping Connections and Coolant Requirements). This kit should be mounted<br />
inside the evaporator unit before installing the unit in the ceiling. Specific installation instructions<br />
are included with the single point power kit.<br />
Control Connections (10-wire on air-cooled, 8-wire on water/glycol cooled)<br />
A field-supplied control connection (24 VAC) is required between the evaporator and the condensing<br />
unit. Control wiring must be installed in accordance with the National Electrical Code (NEC)<br />
Class 2 circuit. Glycol-cooled units also require a two-wire control connection to the drycooler and<br />
pump.<br />
Control wiring between the evaporator and the condensing unit must not allow a voltage drop in<br />
the line of more than 1 volt (16 gauge minimum for 75 feet). Do not connect additional electrical<br />
devices to the control circuit. The internal control transformer is only sized for factorysupplied<br />
components.<br />
Additional control wiring will be required if your system includes other optional monitoring and<br />
control devices.<br />
Four (4) wire (thermostat type) must be connected between the evaporator control board and the<br />
wall box. See Figure 25 and Figure 26 and see Figure 11 for electrical connections.