Vertiv™ | Liebert® DM | User Manual 46
Electrical Installation
Chapter 3: Electrical Installation
In this chapter, the electrical installation of the Vertiv™ Liebert® DM unit is explained in-depth to help users with the various
activities, which include work introduction and installation notes, connecting power cables of the indoor and outdoor units,
connecting the control cables, connecting energy-saving card, and the installation inspection.
• Liebert DM is a range of sophisticated units used in industrial, commercial, or other professional
ecosystem. It is not tailored for the general public. Its total rated power is greater than 1 kW and complies to
the IEC61000-3-12 standard. It is necessary to provide an interface between the user’s power supply and
the grid with a short-circuit ratio greater than or equal to 350.
• The user needs to obtain permission from the utility power department to ensure that the air conditioning
unit connection to the power supply with the short-circuit ratio is greater than or equal to 250.
3.1. Task Introduction
3.1.1. Cables to Connect On-site
1. Power cable of the indoor unit: 3P5W (3 × L + N + PE)
2. Power cable of the outdoor unit for 07 kW, 12 kW and 17 kW: 1P3W (L+N+PE)
3. Power cable of the outdoor unit for 22 kW and 27 kW: standard model: 3P4W (3 x L + PE)
4. Control signal cables of outdoor unit (only for 22 kW and 27 kW)
5. Control signal cables of unit (if relevant function/component is configured)
6. Unit monitoring and control cable (if remote control is applicable)
7. Energy-saving card cable (if applicable)
3.2. Installation Notes
All power and control cabling and ground connections must be in accordance with the national and local
electrician regulations. The power cables should not be lighter than the ordinary PVC sheathed cord GB5023.1
(idt IEC60277) line 53.
1. The connections of all the power cables, control cables, and ground cables should be in compliance with the local and
national electrical regulations.
2. Observe the unit name-plate for the full load current. The cables sizes must meet the conditions as specified in the local
cabling protocols and rules.
3. Mains power supply requirement: 3P5W, 380 Vac to 415 Vac (AP customer), 50Hz, 3×L + N + PE.
4. The power cable connection, if damaged, it has to be replaced immediately to eliminate the dangers. The replacement
procedure must be carried out by an authorized professional or experienced service personnel.
5. The electrical installation and maintenance must be carried out by some authorized personnel or a trained engineer
well-versed with the inner workings of the electrical connection (for example, a service engineer from the manufacturer’s
side).
6. Prior to the cabling, a voltmeter must be used to measure the power supply voltage and ensure that the power supply
has been switched o.
7. The front end of the unit needs to be equipped with a power-disconnection device to ensure safe operation.
8. Use screws, guide rails or other modes to fix the device firmly during the installation process to avoid movement or
shaking during the start-up or operation mode.
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