| UNIT 3: INSTALLATION - LESSON 3: MAIN UNIT INSTALLATION The Main Unit has been designed for either a horizontal or vertical wall installation but can also be installed in a 19” data rack by using the KX-A244X Rack Mount Bracket. Usually a four-foot by four-foot section of 3/4 inch plywood is first securely attached to the wall at the chosen installation location. This location is often referred to as the Main Distribution Frame or MDF. Then, the Main Unit, connecting blocks, and other peripheral equipment can be mounted to the MDF near the Main Unit. For the purpose of this training course, we will discuss a vertical installation with the cable cover to the right of the Main Unit. Before installing the KX-TAW848 Main Unit, be sure to consider the accessibility, environment, and security of the installation location. Remember that the Main Unit requires a dedicated AC power outlet and a good system ground for proper operation. Be sure to leave enough room around the Main Unit to ensure proper airflow as well. Use the mounting screw template and screws provided to locate and mount the Main Unit securely to the wall. Then, connect your earth ground to the ground screw located on the left side of the Main Unit. Now, use the mounting template (found on page 49 of the KX-TAW848 Installation Manual) and screws provided to mount the AC Adaptor securely to the wall. The Main Unit will require a 120 VAC 60 Hz grounded outlet. It is recommended that the outlet be dedicated for the KX-TAW848. An AC power protection device or Uninterruptible Power Supply (UPS) should be installed between the power outlet and Main Unit to protect against an overvoltage condition. A UPS combines power protection and conditioning, while providing an uninterruptible power source in the event that the normal commercial power source is lost. The main consideration when selecting a UPS is determining the runtime requirements. Runtime is the length of time the UPS will continue to provide power to the connected equipment during a power failure. The KX-TAW848 has a maximum current draw of 1.38 amps. By combining the maximum current draw of all equipment to be connected to the UPS, the UPS provider should be able to recommend a model that will meet your runtime requirements. Plug the DC connector of the AC adaptor into the DC IN port of the Main Unit. Plug the AC cord into the AC adaptor, and then plug the other end into the dedicated outlet or UPS.