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

TROUBLESHOOTING–SYSTEM
Problem PossibleCause Solution
The valve operates without sprinkler activation. There is a loss of air pressure in the system or trim. Check for any leaks in the system and trim. Conrm that the AMTA is
operating properly. Consider installing a low-air supervisory switch.
The pressure switch on the air compressor is set too low, or the compressor
is not operating properly.
Increase the “ON” setting of the air compressor’s pressure switch, and check
the air compressor for proper operation.
Water is leaking from the drip check located in the alarm line. Water is getting past the clapper seal and into the intermediate chamber
of the valve.
Check the clapper seal and valve body seat ring for physical damage and
foreign material.
Water is under the clapper seal. Inspect the clapper seal to make sure no water is under the seal. If water is
present, remove and replace the seal. Refer to the “Removing and Replac-
ing the Clapper Seal” section.
Air is leaking from the drip check located in the alarm line. Air is getting past the clapper seal and into the intermediate chamber of
the valve.
Check the clapper seal and valve body seat ring for physical damage and
foreign material.
Water is under the clapper seal. Inspect the clapper seal to make sure no water is under the seal. If water is
present, remove and replace the seal. Refer to the “Removing and Replac-
ing the Clapper Seal” section.
The clapper will not latch closed. There is no water pressure on the diaphragm. Check the water pressure in the diaphragm charge line. Make sure the
restrictor in the diaphragm charge line is clean.
The Auto Drain is not set. Set the Auto Drain by pulling up on the Auto Drain Sleeve.
Water is leaking from the diaphragm assembly. The diaphragm is damaged. Contact Victaulic.
Air is leaking from the diaphragm assembly. The diaphragm is damaged. Contact Victaulic.
REV_B
FireLockNXT™AutoConvertPreactionValve
SERIES 769
PreactionElectricAutoConvertDryTrim
I-769P.AC/ELECINSTALLATION,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_49

Victaulic FireLock NXT 769 Series Specifications

General

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