Victaulic 768N FireLock NXT Series - User Manual

KEEP THESE INSTRUCTIONS WITH THE
INSTALLED VALVE FOR FUTURE REFERENCE
WARNING
• Read and understand all instructions before attempting to install, remove, adjust, or perform maintenance on any Victaulic piping products.
• Depressurize and drain piping systems before attempting to install, remove, adjust, or perform maintenance on any Victaulic piping
products.
• Wear safety glasses, hardhat, and foot protection.
• Save this installation, maintenance, and testing manual for future reference.
Failure to follow instructions and warnings could cause system failure, resulting in death or serious personal injury and property damage.
INSTALLATION, MAINTENANCE, AND TESTING MANUAL I-768N
Series 768N FireLock NXT
™
Dry Valve
I-768N
REV_C

Victaulic 768N FireLock NXT Series Specifications

General

Brand	Victaulic
Model	768N FireLock NXT Series
Category	Control Unit
Language	English

Summary

Series 768 N FireLock NXT Dry Valve Installation Manual

Initial System Setup

Water Flow Alarm Test

Installer Safety Information

Hydrostatic Testing

Receiving the Shipment

Trim Dimensions

Trim Components - Exploded View Drawing

Internal Valve Components - Section View and Exploded View Drawings

Air Supply Requirements

Base- or Riser-Mounted Air Compressors

Recommendations for air supply from base or riser-mounted compressors.

Shop Air or Tank-Mounted Air Compressors

Guidance on using shop air or tank-mounted compressors for air supply.

Compressor Requirements and Settings for Series 768 N FireLock NXT Dry Valve with Series 746-LPA Dry Accelerator

Specific settings for compressors when used with the 746-LPA accelerator.

Settings for Air Supervisory Pressure Switches and Alarm Pressure Switches

Specifications for setting pressure switches for system monitoring.

Resetting the System

Weekly External Inspection

Monthly External Inspection

Required Main Drain Test

Required Water Flow Alarm Test

Required Water Level and Low-Air Alarm Tests

Required Partial Operational Trip Test

Required Full Operational Trip Test

Required Internal Inspection

Section VI Maintenance Procedures

Removing and Replacing the Clapper Seal

Detailed guide for removing and installing the clapper seal.

Removing and Replacing the Clapper Assembly

Steps for disassembling and reassembling the clapper assembly.

Installing the Cover Plate Gasket and Cover Plate

Instructions for fitting the cover plate gasket and cover plate.

Removing and Replacing the Diaphragm

Guide on how to remove and install the valve diaphragm.

Cleaning the Cartridge in the Air and Priming Manifold Assemblies

Procedure for cleaning internal cartridges in manifold assemblies.

Replacing the Filter in Series 776 Low-Pressure Actuators

Steps for replacing the filter element in the low-pressure actuator.

Troubleshooting

Troubleshooting - System

Common problems and solutions related to the overall dry valve system.

Troubleshooting - Series 776 Low-Pressure Actuator

Specific issues and fixes for the Series 776 low-pressure actuator.

Troubleshooting - Series 746-LPA Dry Accelerator

Problems and solutions related to the Series 746-LPA dry accelerator.