Site Preparation
2.3Flooring Requirements
2.3.1Floor Loading
The Liebert FS should be mounted on a finished surface, such as concrete, block, brick or wood. The floor must be strong enough to support the equipment load and suitable for installation of an anchor- ing kit with vertical floor loading properly calculated (assume 2,000 PSI or 140 kg/cm2 contact load at caster wheels; this includes safety factors).
•When installing on a concrete, masonry or stone floor, use the
•If installing on a floor consisting of a material other than
•If installing on a raised floor that is less than 2 in. (5cm) thick or constructed of a material not appropriate for the masonry fasteners provided or lag screw engagement, mount using through bolts with nuts and large diameter washers as shown in Figure 155.
Full details for mounting the cabinet are found in 4.1 - Cabinet Floor Mounting.
NOTE
The above loads (both the fastener manufacturer load and the minimum mounting load) include the required safety factors.
2.3.2Floor-Space Occupation
The Liebert FS cabinet requires a floor space of 23" wide by 33" deep (63 x 83cm), resulting in a foot- print of 5.7 square feet (0.5m2).
2.3.3Clearances
The Liebert FS installation requires a ceiling height of at least 7 ft. (214cm).
The unit occasionally vents air out of the top. Loose ceiling tiles above the unit may be moved by the airflow. Ample clearance to access the cable connection at the top of the unit must also be provided. All system electrical connections are to be routed through the top or side of the cabinet.
A 36" (91cm) clearance is required in the front of the unit for National Electrical Code (NEC) compli- ance.
Maintenance access to all components is from the front; no side or back access is required for mainte- nance. Either side of the system cabinet can be placed against walls (assuming minimum distance from edge of floor). Repair may require access to the rear of the unit. In this unlikely instance, the unit may need to be rolled out from its installed location (cabinet is on casters).
2.4Electrical Considerations
! CAUTION
A qualified electrician must perform all electrical connections. The wires (DC power, grounding, optional status/control and auxiliary power supply) that connect the Liebert FS system(s) to the UPS system must be provided by the electrical contractor (standard) or by Liebert as an option. Wire size and installation must comply with all applicable local, regional and national regulations (e.g., National Electric Code for USA).
2.4.1DC Power Connections
Place the Liebert FS as close as practical to the interconnected UPS. The maximum distance allowed between the UPS and the Liebert FS depends on power levels and the type of DC cables used. Liebert requires sizing DC cables and placing the Liebert FS for a maximum of no more than 2V loop drop (at rated power) between the UPS and the Liebert FS.
The Liebert FS is delivered with the standard UPS interconnection kit for connection of the positive and negative terminals coming from the UPS DC bus or from an external disconnect switch.
For details, see 4.2.2 - DC Power Connections.
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