Victaulic FireLock NXT 769 Series Installation, Maintenance, And Testing Manual

SHOPAIRORTANK-MOUNTEDAIRCOMPRESSORS
In the event a compressor becomes inoperative, a properly sized tank-
mounted air compressor provides the greatest protection for systems.
When shop air or a tank-mounted air compressor is used, the Series
757 Regulated AMTA must be installed. The Series 757 Regulated
AMTA provides proper air regulation from the air reservoir to the
sprinkler system. Use of an air regulator with a base or riser-mounted air
compressor will cause short cycling, resulting in premature wear of the
compressor.
For tank-mounted air compressors, the recommended air pressure of
13 psi/0.9 Bar should be used as the set point for the air regulator. The
“on” pressure of the compressor should be at least 5 psi/0.3 Bar above
the set point of the air regulator.
VICTAULICSERIES757REGULATEDAIRMAINTENANCETRIM
ASSEMBLY(AMTA)OPTION
NOTICE
• VictaulicrecommendsamaximumoftwoSeries769FireLock
NXTPreactionValvesperSeries757RegulatedAMTA.
• Systemsmustbeisolatedwithaspring-loaded,soft-seated
checkvalve.
1
6
5
4
2
3
Bill of Materials
1 ⁄"/3.2 mm Restrictor
2 Slow Fill Ball Valve (Normally Open)
3 Air Regulator
4 Strainer (100 Mesh)
5 Spring-Loaded, Soft-Seated
Ball Check Valve
6 Fast Fill Ball Valve (Normally Closed)
COMPRESSORREQUIREMENTSANDSETTINGSFORSERIES769
FIRELOCKNXTPREACTIONVALVESINSTALLEDWITHSERIES
746-LPADRYACCELERATORS
A tank-mounted air compressor with a Series 757 Regulated AMTA
must be used to supply air to a Series 769 FireLock NXT Preaction
Valve installed with a Series 746-LPA Dry Accelerator. In the event a
compressor becomes inoperative, a properly sized tank-mounted air
compressor provides the greatest protection, since air can be supplied
continuously to the sprinkler system for an extended time period. In
addition, a properly-sized tank-mounted air compressor prevents clog-
ging of the dry accelerator’s orifice.
Set the air regulator of the Series 757 Regulated AMTA to a minimum of
13 psi/0.9 Bar. The air regulator of the Series 757 Regulated AMTA is a
relief-type design. Any pressure in the system that is above the set point
of the air regulator will be released. Therefore, charging the air regulator
above the set point could cause premature operation of a valve installed
with a Series 746-LPA Dry Accelerator.
SETTINGSFORAIRSUPERVISORYPRESSURESWITCHESAND
ALARMPRESSURESWITCHES
1. Air supervisory pressure switches are required for preaction
systems and must be set according to the following notes. NOTE:
Switches for Vic-Quick Risers are pre-set at the factory.
1a. Wire the air supervisory pressure switches to activate a
low-pressure alarm signal. NOTE: In addition, the local
authority having jurisdiction may require a high-pressure
alarm. Contact the local authority having jurisdiction for this
requirement.
1b. Set the air supervisory pressure switches to activate at
2 – 4 psi/0.1 – 0.3 Bar below the minimum air pressure
required (but not lower than 10 psi/0.7 Bar).
1c. Wire the alarm pressure switch to activate a water flow alarm.
1d. Set the alarm pressure switch to activate on a pressure rise of
4 – 8 psi/0.3 – 0.6 Bar above the pressure required.
REMOTESYSTEMTESTVALVEREQUIREMENTS
The remote system test valve (inspector’s test connection) should
contain a UL Listed and/or FM Approved valve (normally closed), which
can be opened to simulate the operation of a sprinkler.
The remote system test valve (inspector’s test connection) should be
located at the most hydraulically demanding location in the release
system. NOTE: Multiple restrictions on the remote system test valve
(inspector’s test connection) may slow the air decay rate and cause the
system to respond slower than required.
The remote system test valve (inspector’s test connection) should termi-
nate with an orifice equal to the smallest orifice in the releasing system.
The remote system test valve (inspector’s test connection) is used to
ensure that water reaches the most remote part of the system within 60
seconds.
IMPORTANTINSTALLATIONINFORMATION
1. For proper operation and approval, the Series 769 FireLock NXT
Preaction Valve must be installed in accordance with the specific
trim diagrams included with the shipment. NOTE: Victaulic pro-
vides specific trim diagrams for installations involving a Series 746-
LPA Dry Accelerator.
2. Before installing the Series 769 FireLock NXT Preaction Valve,
flush the water supply piping thoroughly to remove all foreign
material.
3. Series 769 FireLock NXT Preaction Valves MUST NOT be located
in an area where the valve can be exposed to freezing tempera-
tures. In addition, the Series 769 FireLock NXT Preaction Valve
MUST NOT be located in an area where physical damage may
occur.
4. It is the system designer’s responsibility to confirm material com-
patibility of the Series 769 FireLock NXT Preaction Valve, trim, and
associated accessories when a corrosive environment or contami-
nated water is present.
5. SERIES769FIRELOCKNXTPREACTIONVALVESMUSTBE
INSTALLEDONLYINTHEVERTICALPOSITIONWITHTHE
ARROWONTHEBODYPOINTINGUPWARD.
6. Air or nitrogen supply to the dry piping system must be clean, dry,
and oil-free.
7. Air supplies must be regulated, restricted, and continuous.
REV_B
FireLockNXT™AutoConvertPreactionValve
SERIES 769
PreactionElectricAutoConvertDryTrim
I-769P.AC/ELEC
INSTALLATION,MAINTENANCE,ANDTESTINGMANUAL
www.victaulic.com
VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2009 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA.
I-769P.AC/ELEC_11

Victaulic FireLock NXT 769 Series Specifications

General

Brand	Victaulic
Model	FireLock NXT 769 Series
Category	Control Unit
Language	English