Resetting The System - Victaulic 769N FireLock NXT Series Installation, Maintenance, And Testing Manual

I-769N.Deluge / Series 769N FireLock NXT

RESETTING THE SYSTEM

• Prior to resetting the system, the cover plate shall be removed
to verify that the clapper is resting on the seat in the closed
position. Failure to do so may result in damage to the diaphragm
during the reset procedure.
• As a practical alternative to removing the cover plate, an
additional control valve can be added to the system above the
deluge valve. This will allow for full trip tests to be conducted
while preventing water from entering the system.
Step 1:
Isolate the charge line ball valve by placing it in the closed position.
Step 2:
Close the water supply main control valve.
Step 2a: Isolate the air supply to the system.
Step 3:
Open the system main drain valve. Confirm that the system is drained.
Step 3a: Push in the ball drip plunger to release pressure.
Step 3b: The cover plate shall be removed to verify that the
clapper is resting on the seat in the closed position. Failure to
do so may result in damage to the diaphragm during the reset
procedure. Refer to Section V.
Ball Drip
Plunger
(Step 3a)
Water Supply Main
Control Valve
(Step 2)
REV_F
™ Deluge Valve / Installation, Maintenance, and Testing Manual
NOTICE
Pneumatic (Dry Pilot) Release Trim Shown
(Manual pull station not shown for clarity of components)
Charge Line
Ball Valve
(Step 1)
Step 4:
Close the system main drain valve.
Step 5:
Confirm that all system drains are shut and that the system is free
from leaks.
Step 6:
Confirm that the system has been depressurized. The gauges should
indicate zero pressure.
Step 7:
Confirm that the alarm test ball valve is closed.
Step 8:
Follow steps 4 - 12 of the "Initial System Setup" section.
Alarm Test
Ball Valve
(Step 7)
System Main
Drain Valve
(Steps 3 & 4)
I-769N.Deluge_21