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I-768N / Series 768N FireLock NXT ™ Dry Valve / Installation, Maintenance, and Testing Manual. TROUBLESHOOTING – SYSTEM. Problem. FireLock NXT Series. We have 1 Victaulic 768N FireLock NXT Series manual available for free PDF download: Installation, Maintenance, And Testing Manual Read and understand all instructions before attempting to install, remove, adjust, or perform maintenance on any Victaulic piping products. All products to be installed in accordance with current Victaulic installation/assembly instructions. Victaulic reserves the right to change product View and Download Victaulic 768N FireLock NXT Series installation, maintenance, and testing manual online. Dry Valve. 768N FireLock NXT Series control unit Rebuild Kit Instructions for Series 768N FireLock NXT™ Dry Valves, Series 769N FireLock NXT™ Deluge Valves, and Series 769N FireLock NXT™ Preaction Valves The following instructions are a guide for proper installation of Victaulic Series 768 FireLock NXT Dry Valves. These instructions involve pipe that is properly I-768N / Series 768N FireLock NXT ™ Dry Valve / Installation, Maintenance, and Testing Manual. RESETTING THE SYSTEM. Step 1: Isolate the charge line ball