I-768N
/ Series 768N FireLock NXT
™
Dry Valve
/ Installation, Maintenance, and Testing Manual
Auto Vent
Sleeve of
Series 776
Low-Pressure
Actuator
(Step 5)
Alarm Test
Ball Valve
(Step 3)
INITIAL SYSTEM SETUP
Step 1:
Confirm that all system drains are shut and that the system is free of
leaks.
Step 2:
Confirm that the system has been depressurized. The gauges should
indicate zero pressure.
Step 2a:
If a Series 746-LPA Dry Accelerator is installed, confirm
that the isolation ball valve is closed.
Step 2b:
If a Series 746-LPA Dry Accelerator is installed, open
the 1/4-turn vent ball valve.
Step 3:
Confirm that the alarm test ball valve is closed.
Step 4:
Charge the system with air by turning on the compressor or by
opening the fast-fill ball valve on the AMTA. Charge the system to
13 psi/90 kPa/0.9 Bar minimum. Refer to the “Air Supply Requirements”
section.
Step 5:
When the system reaches approximately 10 psi/69 kPa/0.7 Bar, and no
additional moisture is being released from the Auto Vent, pull up on the
Auto Vent Sleeve of the Series 776 Low-Pressure Actuator.
NOTE:
The
Auto Vent Screw should seal and remain in the set (“UP”) position.
Step 6:
When system air pressure is established, close the fast-fill ball valve on
the AMTA.
Step 7:
Open the slow-fill ball valve on the AMTA.
NOTE:
Failure to leave the
slow-fill ball valve open may allow system pressure to drop, resulting in
valve operation in the event of a system leak.
I-768N_11
REV_C
