I-768N
/ Series 768N FireLock NXT
™
Dry Valve
/ Installation, Maintenance, and Testing Manual
WEEKLY EXTERNAL INSPECTION
CAUTION
• Perform a visual inspection of the valve and trim on a weekly
basis.
• If the dry system is equipped with a low-pressure alarm, monthly
inspections may be sufficient. Contact the local authority having
jurisdiction for specific requirements.
Failure to perform weekly inspections may result in damage to the
valve and trim.
MONTHLY EXTERNAL INSPECTION
1.
Record the system air pressure and water supply pressure.
Confirm that the water supply pressure is within the range of
normal pressures observed in the area. Significant loss of water
supply pressure could indicate an adverse condition in the water
supply. Confirm the proper water-to-air ratio is being maintained.
2.
Confirm that there is no leakage from the intermediate valve
chamber. The ball drip on the alarm manifold assembly should not
be leaking water or air.
3.
Inspect the valve and trim for mechanical damage and corrosion.
Replace any damaged or corroded parts.
4.
Confirm that the dry valve and trim are located in an area that is
not subject to freezing temperatures.
5.
Confirm that all valves are in their normal operating positions (refer
to the table below).
Valve
Normal Operating Position
Water Supply Main Control Valve
Open
Water Supply Main Drain Valve
Closed
System Main Drain Valve
Closed
Charge Line Ball Valve of the Priming Manifold Assembly
Open
Alarm Test Ball Valve of the Priming Manifold Assembly
Closed
Isolation Ball Valve for Series 746-LPA Dry Accelerator
(if applicable)
Open
1/4-Turn Vent Ball Valve for Series 746-LPA Dry Accelerator
(if applicable)
Closed
Slow-Fill Ball Valve of the Victaulic AMTA (if applicable)
Open
Fast-Fill Ball Valve of the Victaulic AMTA (if applicable)
Closed
6.
If a Series 746-LPA Dry Accelerator is installed, record the
pressure in the air chamber of the dry accelerator. The pressure
in the air chamber should equal the system air pressure within the
allowable tolerances of the gauges. If the air chamber’s pressure
is below the system air pressure, follow the “Troubleshooting”
section.
Ball Drip
(Step 2)
I-768N_17
REV_C
