To replace the System Sensor CHSRL Chime Strobe, first, ensure that power to the fire alarm system is turned off to prevent any electrical hazards. Then, remove the existing CHSRL from the wall by carefully unscrewing it from its mounting plate. Disconnect the wires from the terminals, noting their positions for reconnection. Next, take the new CHSRL and connect the wires to the corresponding terminals, ensuring a secure connection. Mount the new CHSRL onto the wall using the provided screws and mounting plate. Finally, restore power to the fire alarm system and test the new CHSRL to ensure proper functionality. If you encounter any difficulties or uncertainties during the process, consult the manufacturer’s installation instructions or seek assistance from a qualified technician.