Victaulic FireLock NXT 768 Series User Manual

16b. If pressure in the diaphragm charge line does not drop, re-open
the diaphragm-charge-line ball valve, and proceed to the following
step.
17. If a Series 746-LPA Dry Accelerator is installed, close the ¼-turn
vent ball valve.
18. If a Series 746-LPA Dry Accelerator is installed, open the isolation
ball valve. This will set the accelerator.
19. Observe the system air pressure over a 24-hour period to confirm
system integrity. If there is degradation in system air pressure, find
and correct all leaks. NOTE: NFPA requires less than 1½-psi/
10-kPa/0.1-Bar leakage in 24 hours.
20. Open the water supply main drain valve.
CAUTION
Takeprecautionswhenopeningthewatersupplymaincontrol•
valve,sincewaterwillflowfromallopensystemvalves.
Failuretofollowthisinstructioncouldresultinpropertydamage.
Water Supply Main
Control Valve
21. Open the water supply main control valve slowly until water flows
steadily from the open water supply main drain valve.
I-768_16
FireLockNXT™DryValve
SERIES768
I-768INSTALLATION,MAINTENANCE,ANDTESTINGMANUAL
www.victaulic.com
VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2007 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA.
REV_D

Victaulic FireLock NXT 768 Series Specifications

General

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