Vertiv | Liebert® DM | User Manual 15
Mechanical Installation
Chapter 2: Mechanical Installation
This chapter describes the mechanical installation of the Vertiv™ Liebert® DM, including unpacking & inspection, installation
notes, system installation arrangement, installing indoor and outdoor units, piping, removing transportation fasteners, adding
refrigerant for long pipe system, and inspection items.
2.1. Unpacking and Inspection
Move the unit to the location near to the final installation site and then unpack the packaging.
Check that the fittings are complete and the components are intact against the packing list. If any parts are found missing or
damaged, report immediately to the local oice of the carrier and Vertiv representative. Do not accept a damaged unit
The air conditioning unit is factory charged with 0.2 MPa (2 bar) of nitrogen. If the unit has no pressure after
unpacking inspection, then consult Vertiv representative.
2.2. Installation Notes
• The Liebert DM adopts raised floor installation; adequate installation space for the indoor unit must be provided. The
air-cooled indoor unit must be installed on the floor of equipment room or computer room and the outdoor unit must be
installed outside of equipment/computer room or on the floor of other rooms.
• Vertiv recommends that the site preparation is defined as per the requirements. However, if these requirements are not
met, Vertiv recommends that rectifications should be made on the site in order to comply with the specified requirements
and conditions.
• However, if the rectifications or modifications are not implemented, then Vertiv does not guarantee the accuracy and
precision of the temperature and humidity provided by the unit.
• The Liebert DM air-cooled air conditioner is charged in the factory with 0.2 MPa (2 bar) nitrogen for shipping; before
installation release the internal nitrogen of the unit.
• The installers must strictly follow the design drawings for installation and reserve the space for maintenance. The
manufacturer’s engineering dimension drawings can serve as a reference.
2.3. System Installation Arrangement
2.3.1. System Arrangement during Installation
The refrigerant piping is required to connect the indoor and the outdoor units of the air-cooled system. The system
arrangement diagram of the refrigeration system is shown in Figure 2-1.
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