Chapter 3 Electrical Installation; Task Introduction; Notes; Connecting Power Cable Of Indoor Unit - Liebert DM Series User Manual

User manual (78 pages)

Table of Contents

This chapter introduces the electrical installation of the Liebert_DM AC, including task introduction, notes, connecting

power cables of indoor unit and outdoor unit, connecting control cables, connecting energy-saving card and check

list.

3.1 Task Introduction

Electrical connections to be made at the installation site are:

1. Power cable of the indoor unit: 3-ph (3 × L + N + PE).

2. Power cable of the outdoor unit: standard model (L + N + PE) and Lee-Temp model (L + L' + N + PE).

3. Unit monitoring and control cable (if remote control is applicable).

4. Energy-saving card cable (if applicable).

3.2 Notes

This AC is a professional device, used in industrial, commercial or other professional occasions. It is not for sale to

general public. Its total rating power is larger than 1kW, complying with IEC61000-3-12 standard. A port with no less

than 250 short circuit ratio is required between the user power and the grid. The user needs to get permission from

the power supply department, to ensure that the AC is connected to a power with no less than 250 short circuit ratio.

1. All power and control wiring and ground connections must be in accordance with the national and local electrician

regulations.

2. Refer to unit nameplate for full load current. Cable size should be in accordance with the local wiring rules.

3. Mains requirement: 3-ph (380Vac, 50Hz, 3 × L + N + PE).

4. The electrical installation must be completed by trained professionals.

5. Before the wiring, use a voltmeter to measure the power voltage and make sure that the power has been switched

off.

6. An all-pole disconnection device must be configured upstream the device to ensure operation safety.

7. If the mains cord is damaged, it must be replaced by professional maintenance personnel.

3.3 Connecting Power Cable Of Indoor Unit

The unit does not have a power cable of indoor unit according to standard configuration, please contact Emerson or

purchase it on your own. The recommended cable size is not less than 10AWG (6mm

Use the provided inner hexagon wrench to loosen the fixing screws of the indoor unit door, lift and loose the front door,

and then disconnect the display board connecting terminals, after that you can remove the front door. At this point,

the power output terminal of the indoor unit is revealed at the left side panel, as shown in Figure 3-1.