Digital Keypad (490-0452) Testing the System Faxback Doc. # 17359 Check the system once a week to be sure it is operating properly. Refer to the main control unit's operation instructions for proper test procedures (for the 49-485 see Faxback Doc. #14902 and for the 49-451 see Faxback Doc. # ). IMPORTANT: To prevent false alarms when testing your system, be sure to disconnect security dialers or any other devices that send a message to a remote location. Because the alarm system sounds during these tests, be sure to notify your neighbors and any proper authorities of the test.