I-768N
/ Series 768N FireLock NXT
™
Dry Valve
/ Installation, Maintenance, and Testing Manual
installed on the charge line downstream of the priming manifold
assembly. Another option is to install a Series 75B Supplemental
Alarm Device.
7. Pitch the water supply piping.
Per NFPA 13 requirements, piping
must be pitched so that systems can drain properly. For areas that
are subject to high levels of condensation, or where piping is not
properly pitched, an optional Series 75D Water Column Device kit
is available to assist in a utomatically draining water out of the riser.
8. IF THE INLET WATER SUPPLY IS INTERRUPTED FOR ANY
REASON, AND SYSTEM SUPPLY PRESSURE TO THE VALVE
DECREASES, ENSURE THAT THE CHARGE LINE IS FULLY
PRESSURIZED BEFORE PLACING THE SYSTEM BACK IN
SERVICE.
HYDROSTATIC TESTING
WARNING
• If air testing is required, DO NOT exceed
50 psi/345 kPa/3.4 Bar air pressure.
Failure to follow this instruction could result in
death or serious personal injury and property
damage.
The Series 768N FireLock NXT Dry Valve is cULus Listed and
FM Approved for a maximum working pressure of:
• 300 psi/2065 kPa/20.7 Bar
The Series 768N FireLock NXT Dry Valve is factory tested to:
• 600 psi/4135 kPa/4.1 Bar (all sizes)
The valve can be hydrostatically tested against the clapper at:
• 200 psi/1380 kPa/13.8 Bar or 50 psi/345 kPa/3.4 Bar above
the normal water supply pressure (2-hour limited time period) for
acceptance by the authority having jurisdiction
RECEIVING THE SHIPMENT
NOTICE
• Drawings and/or pictures in this manual may be exaggerated for
clarity.
• This product and this installation, maintenance, and testing
manual contain trademarks, copyrights, and/or patented features
that are the exclusive property of Victaulic.
The components shaded in orange below are shipped separate from
the valve and must be installed in accordance with the trim drawing
provided.
NOTE:
The Vic-Quick Riser (VQR) assembly is shown.
1.
Ensure that all components are included in the shipment and that
all necessary tools are available for installation. Verify that the
provided trim drawing matches the system’s requirements.
CAUTION
• Ensure that all protective shipping items are removed from the
interior and exterior of the valve body before installation.
• Ensure that no foreign material gets into the valve body, pipe
nipples, or valve openings.
• If using any material other than PTFE thread sealant tape, use
extra caution so that material does not enter the trim.
Failure to follow these instructions could cause improper valve
operation, resulting in personal injury and property damage.
2.
Remove all plastic caps and foam spacers from the valve.
3.
Install the valve assembly into the riser with two Victaulic rigid
couplings. Refer to the instructions, supplied with the coupling, for
complete installation requirements.
SERIES 768N FIRELOCK NXT
DRY VALVES MUST BE INSTALLED ONLY IN THE VERTICAL
POSITION WITH THE ARROW ON THE BODY POINTING
UPWARD.
4.
For components shipped separate from the valve, apply a small
amount of pipe joint compound or PTFE thread sealant tape to
the external threads of all threaded connections. DO NOT get any
tape, compound, or other foreign material into the openings of the
threaded connections.
4a. FOR VALVES INSTALLED WITH A SERIES 746-LPA DRY
ACCELERATOR:
The end with the vent seal “button” must be
installed facing down (toward the trim), in accordance with the trim
drawing provided.
Compression Fitting and Tube Configuration
for Auto Drain and Alarm Manifold Assembly
Compression Fitting and Tube Configuration
for Actuator
5.
Compression fittings and tubes are provided for connection
from the outlet of the auto drain, alarm manifold assembly, and
actuator to the drip cup or drain. Install the compression fittings
in accordance with the trim drawing provided.
NEVER INSERT
A PLUG INTO THE OUTLET OF THE AUTO DRAIN, ALARM
MANIFOLD ASSEMBLY, OR ACTUATOR IN PLACE OF THE
COMPRESSION FITTING/TUBE.
I-768N_5
REV_C
