Dell PowerEdge 2550 Rack Installation Guide - Page 20

www.dell.com | support.dell.com 5 If your rack has wide hole spacing (see Figure 1-3), mark the lower and middle mounting positions on the vertical rails as shown by the bottom and middle V-notches on the sides of the template. Each 1-U (1.75-inch) vertical space on a rack with wide hole spacing has two holes with center-to-center spacing between holes (beginning at the top of a 1-U space) of 1.25 inches (see Figure 1-3). Installing the Slide Assemblies in the Rack You can install the slide assemblies in a 2-post open-frame rack having either universal-hole spacing (see Figure 1-2) or wide hole spacing (see Figure 1-3). You can install the 2-U RapidRails in either a flush-mount or center-mount configuration. CAUTION: The 2-U RapidRails rack kit is designed to support a single system in a 2-post open frame relay rack. Do not attempt to install any other system using this kit. Damage to the system and personal injury to you and others may result. Center-Mount Installation To prepare the RapidRails slide assemblies for center-mount installation in the 2-post rack, perform the following steps: 1 Using a 3/8-inch nut driver, loosen by one-half turn the two locking nuts that attach the center bracket to each slide assembly. 2 Center the alignment hole on the bracket with an appropriate alignment hole on each slide assembly. There is an alignment hole on each movable bracket(see Figure 1-12). 3 Position the right slide assembly in the two-post rack at the location you marked, adjust the front and rear brackets tightly against the vertical two-post rack and secure the front and rear center mounting brackets to the rack with two 12-24 x 0.5-inch pan-head Phillips screws. 4 Repeat step 3 to install the left slide assembly in the rack. 5 Using a 3/8-inch nut driver, tighten the locking nuts on the center mounting brackets of both right and left slide assemblies (see Figure 1-11). 1-14 Rack Installation Guide