When the system in a fully de$-$energized state, pressing & holding the STARTUP button for at least $2$ seconds will trigger the first stage of SYSTEM STARTUP, immediately causing: $$ The System Operational and System Starting indicators to illuminate $($ON$),$ The Safety Lights to begin flashing slowly $($ON $1$ sec $$ OFF $1$ sec $$ repeat$),$ and $$ The Signal Horn to sound $($ON$)$ for $2$ seconds and then shut OFF. Once the initial Signal Horn finishes sounding $($shuts OFF$),$ the system will wait for one of the following two events $($I or II$)$ to occur: I$)$ Pressing & releasing the STARTUP button will trigger the second stage of SYSTEM STARTUP, causing the following ordered set of events to occur: a$)$ The Safety Lights will begin flashing quickly $($ON $(1)/(2)$ sec $$ OFF $(1)/(2)$ sec $$ repeat$),$ b$)$ The Signal Horn will sound $($ON$)$ for $1$ second $$ shut OFF for $(1)/(2)$ second $$ sound $($ON$)$ for $1$ second $$ shut OFF for $(1)/(2)$ second $$ sound $($ON$)$ for $1$ second $$ shut OFF. c$)$ When the Signal Horn finishes cycling ON$/$OFF for the third time $($step b$),$ the System Starting indicator will shut OFF, at which point SYSTEM STARTUP is complete and the system will begin its NORMAL OPERATION operational state. Notes $$ The second stage of SYSTEM STARTUP requires the STARTUP button to be both pressed and released after the initial two$-$second signal horn is complete. The second stage will not be triggered by continuously holding$-$in the STARTUP button after initially pressing and holding it in for $2$ seconds in order to trigger the first stage of SYSTEM STARTUP. $$ Pressing the SHUTDOWN button while the Safety Lights are flashing quickly during the second stage of SYSTEM STARTUP will have no effect on the system$$s operation. II$)$ Pressing the SHUTDOWN button will immediately cause the Signal Horn to sound $($ON$)$ for $3$ seconds and then shut OFF, after which both the Safety Lights and the System Starting indicator will shut OFF, returning the system to a fully$-$de$-$energized state.