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This chapter introduces the electrical installation of the Liebert.PEX series air conditioner, including work introduction
and installation notes, wiring of indoor unit, wiring of outdoor unit and installation inspection.
3.1 Work Introduction And Installation Notes
Wires to connect at site
1. Power cable and control cable of indoor unit.
2. Solenoid valve of pipe extension kit (field installed option).
3. Outdoor unit (air-cooled series): signal control cable and power cable.
4. Input and output control cables of the unit.
Installation notes
1. The connection of all power cables, control cables and ground cables should comply with the local and national
electrician regulations.
2. See the unit nameplate for the full load current. The cable sizes should meet the local wiring rules.
3. Mains supply requirement: 400Vac, 50Hz.
4. The electrical installation must be performed by qualified professional installation personnel.
5. Before the wiring, use a voltmeter to measure the power supply voltage and make sure that the power supply has
been switched off.
3.2 Wiring Of Indoor Unit
3.2.1 Locating Electrical Interface Of Indoor Unit
Open the front door of the indoor unit to reveal the interfaces of the electrical control box, as shown in Figure 3-1,
Figure 3-2 and Figure 3-3.
Chapter 3 Electrical Installation
Field connection terminal block
Figure 3-1 Electrical control box interfaces of one-bay unit
Liebert.PEX2 Series Air Conditioner User Manual
Chapter 3 Electrical Installation
Power
supply
connection
35
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