Optional Configuration for Liebert CW Seismic Application
Liebert
®
CW
™
System Design Manual 82
A.2 Requirements for Seismic Anchorage
A.2.1 Seismic Anchors
Mounting requirement details such as brand, type, embedment depth, edge spacing, anchor spacing,
concrete strength, wall bracing and special inspection must be outlined and approved by the project
structural engineer of record.
A.3 Anchor and Load Requirements of Seismic Installation
All floor and housekeeping pads must be approved by the structural engineer of record to resist the added
seismic loads from components being anchored as defined in this section. Data is presented by system
configuration. The maximum system loads are given for each loading location or floor stand foot. The
maximum load at the anchor is provided for proper sizing of the anchors (not provided by Emerson).
A.3.1 Seismic Anchorage Surface
Structural floors and housekeeping pads must also be seismically designed and approved by the project
structural engineer of record to withstand the seismic anchor loads as defined on the installation drawings.
The installing contractor is responsible for the proper installation of all anchors and mounting hardware,
observing the mounting requirement details outlined by the engineer of record. Contact the manufacturer’s
representative if a detailed Seismic Installation Calculation Package is required.
NOTE
The floor stand used with EC units is not symmetrical, and its orientation to the Liebert CW is
critical to lowering the EC fans. Unless the floor stand is installed in the correct position, the
blowers will not lower into the floor stand.
NOTE
Load interactions must be considered when selecting anchors.
Table A-2 Downflow Liebert CW models on floor stand with 36" plenum, CW026-CW081
Model #
Floor
Stand
Height
Operating
Mass 1
Restraint
Locations
Maximum Load
per Anchor
Maximum Load per
Location
Anchors
per
LocationTension Shear Tension Shear
CW026-CW041DC1
24 1108.1 4 554.8 155.1 1164.6 310.5 2
48 1149.8 4 778.6 160.5 1633.4 321.4 2
CW051 CW060DC1
24 1538.4 44 648.2 211.8 1426.8 423.5 2
48 1588.6 4 913 218.4 2005.6 436.7 2
CW076-CW084DC1
24 1881.1 6 533.1 175.6 1169.5 351.4 2
48 1950.3 6 753.5 181.7 1649.7 363.5 2
CW089-CW114DC1
24 2589.5 6 722.7 241.7 1611 483.4 2
48 2667.6 6 1009.7 248.6 2245.6 497.1 2
CW146-CW181DC1
2
24 3136.5 6 943 284.7 2017.7 569.6 2
48 3237 6 1233.8 294.5 2636.9 589.2 2
1. Operating mass includes the operating water volume, floor stand and plenum.
2. 18" filter plenum only
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