24 NFS2-3030/E Installation Manual — P/N 52544:N1 07/18/2014Installation Attaching the CPU & Chassis3. Place the board over the stand-offs so that mounting holes line up with those on the chassis.Secure all stand-offs with screws provided.3.5.2 Mounting in the CA-2 Audio System ChassisThe NFS2-3030 will mount into the CA-2chassis assembly—along with a DVC,microphone and optional telephone handset—as part of an audio command centerinstallation.The CA-2 is a two-row assembly consisting of• a back plate that attaches to the backbox• two half-chassis, each of which takes upthe left half of a backbox row• a microphone and telephone handset well• a microphoneCA-2 can also mount TELH-1, an optionaltelephone handset.! CAUTION:IT IS CRITICAL THAT ALL MOUNTING HOLES OF THE FIRE ALARM CONTROL PANEL ARESECURED WITH A SCREW OR STAND-OFF TO INSURE CONTINUITY OF EARTH GROUND.CPU standoffs at Positions 1 and 2:1.5 inch (38.1 mm) for use with CPU2-3030Dor 0.25 inch (6.35 mm) for use with CPU2-3030NDCHS-M3.cdrCPU2-3030ND(without keypad/display)CPU2-3030D(with keypad/display)Chassis-mounting slotsFigure 3.5 Standoffs on Chassis CHS-M3Do Not Use.Figure 3.6 CA-2 Chassis AssemblyCA2chassisassembly.wmfUpperhalf-chassis(FACP)Lowerhalf-chassis(DVC)MicrophoneandhandsetwellBack plate