Victaulic FireLock 756 Series

Other manuals for Victaulic FireLock 756 Series

Installation, Maintenance, & Testing Manual30 pages

Questions and Answers

K
kyle37Aug 17, 2025
Why is my Victaulic FireLock 756 valve operating without sprinkler activation?
- F
  Frances KennedyAug 17, 2025
  The valve might be operating without sprinkler activation due to several reasons: * There could be a loss of air pressure in the lower inlet chamber. In this case, check for air loss at the lower chamber seal and turn the adjustment nut counterclockwise to seal any leaks. Also, check the system and trim for leaks and ensure the AMTA is operating correctly. * If the system air pressure exceeds 2 Bar, decrease it. * A loss of air pressure in the upper air chamber could be the cause. Apply soapy water to all joints around the Series 746-LPA Dry Accelerator to check for leaks and repair them. * The air decay rate of the system might be too slow. Ensure there are no restrictions in the remote system test valve.
B
Bonnie SmithAug 19, 2025
What to do if water is leaking through the Series 776 Low-Pressure Actuator of my Victaulic FireLock 756 Control Unit?
- M
  michaeljosephAug 20, 2025
  If water is leaking through the Series 776 Low-Pressure Actuator, it could be due to a few reasons: * The air chamber might not be set correctly. Ensure the vent seal is in the set position and the air chamber is pressurized. * The strainer might be clogged. Replace the strainer screen.
A
awellsAug 22, 2025
What to do if water is leaking from the drip check located in the alarm line of my Victaulic Control Unit?
- B
  brittney54Aug 22, 2025
  If water is leaking from the drip check in the alarm line, it indicates that water is getting past the clapper seal and into the intermediate chamber of the valve. You should check the clapper seal and valve body seat ring for any physical damage or foreign material. Also, inspect the clapper seal to ensure no water is under the seal; if water is present, remove and replace the seal.
S
Stephanie StricklandAug 25, 2025
What to do if air is leaking from the drip check located in the alarm line of my Victaulic FireLock 756 Control Unit?
- D
  Denise LawrenceAug 26, 2025
  If air is leaking from the drip check in the alarm line, it means air is getting past the clapper seal and into the intermediate chamber of the valve. You should check the clapper seal and valve body seat ring for physical damage and foreign material. Also, inspect the clapper seal to ensure no water is under the seal; if water is present, remove and replace the seal.
C
Carlos BrownAug 27, 2025
How to fix Victaulic FireLock 756 Control Unit Series 746-LPA Dry Accelerator if it doesn't set up properly?
- M
  Maria HudsonAug 27, 2025
  If the Series 746-LPA Dry Accelerator does not set up properly, it might be installed upside-down. Remove the Series 746-LPA Dry Accelerator from the trim, and turn the unit around so that the vent seal “button” is facing down (toward the Series 776 Low-Pressure Actuator).
J
Joel JonesAug 30, 2025
Why won't the clapper latch closed on my Victaulic Control Unit?
- T
  Terry ThompsonAug 31, 2025
  The clapper might not latch closed because there is no water pressure on the diaphragm. Check the water pressure in the diaphragm charge line and make sure the restrictor in the diaphragm charge line is clean. Also, ensure the Auto Drain is set by pulling up on the Auto Drain Sleeve.
S
Stephanie RojasSep 2, 2025
What to do if no water is passing through the Series 776 Low-Pressure Actuator of my Victaulic FireLock 756 Control Unit?
- J
  Jason TaylorSep 2, 2025
  If no water is passing through the Series 776 Low-Pressure Actuator, the strainer on the diaphragm charge line might be clogged. Disassemble and clean the diaphragm charge line strainer.
D
Dwayne StewartSep 5, 2025
What to do if the Auto Vent Sleeve of the Series 776 Low-Pressure Actuator in my Victaulic Control Unit does not stay set in the “UP” position?
- T
  tracy94Sep 5, 2025
  If the Auto Vent Sleeve of the Series 776 Low-Pressure Actuator does not stay set in the “UP” position, it could be because the Series 776 Low-Pressure Actuator is not receiving enough air. Increase the air pressure going into the Series 776 Low-Pressure Actuator.
J
James SpenceSep 7, 2025
Why can't I pressurize the air side of my Victaulic FireLock 756 Control Unit?
- S
  Sean Knox DDSSep 7, 2025
  If you cannot pressurize the air side of the dry actuator, the issue might be a blockage in the airline. Try removing and cleaning the airline strainer and the 1,6-mm airline restrictor.
M
Mr. Joshua SmithSep 10, 2025
What to do if water leaks through the lower chamber of my Victaulic FireLock 756?
- K
  Kristina SmithSep 12, 2025
  If water leaks through the lower chamber while the piston charge line is pressurizing after setting the dry actuator, it could be due to the adjustment nut on the vent seal being set too high or a damaged lower seat/water seal. Turn the adjustment nut under the vent seal clockwise until it reaches the actuator housing. While the system is pressurized with air, pull up on the auto vent. Turn the adjustment nut under the vent seal counterclockwise while gently holding down the vent seal. Continue turning the adjustment nut slowly until the vent seal seals. Then, turn the vent seal 1/8 of a turn more counterclockwise. Contact Victaulic.

Summary

Installer Safety Instructions

Section View Drawing and Description - Series 776 Low-Pressure Actuator

Section View Drawing and Description - Series 746-LPA Dry Accelerator

Air Supply Requirements

Important Installation Information

Compressor Requirements and Settings for Series 756 FireLock Dry Valves Installed with Series 746-LPA Dry Accelerators

Compressor requirements for specific valve/accelerator configurations.

Settings for Air Supervisory Pressure Switches and Alarm Pressure Switches

Remote System Test Valve Requirements

Valve;Trim Installation

Placing the System in Service

External Inspection

Required System Tests

Water Flow Alarm Test

Steps to perform a water flow alarm test.

Water Level and Low Air Alarm Tests

Procedures for water level and low air alarm tests.

Required Operational (Trip) Tests

Partial Operational (Trip) Test

Full Operational (Trip) Test

Required Internal Inspection

Troubleshooting

Troubleshooting - Series 776 Low-Pressure Actuator

Solutions for problems with the 776 Low-Pressure Actuator.

Troubleshooting - Series 746-LPA Dry Accelerator

Solutions for problems with the 746-LPA Dry Accelerator.

Troubleshooting - System

Solutions for general system troubleshooting issues.

Victaulic FireLock 756 Series Specifications

General

Application	Fire Protection Systems
UL Listed	Yes
FM Approved	Yes
Model Series	756 Series
Type	Pressure Reducing Valve
Pressure Rating	300 psi (20.7 bar)
Body Material	Ductile iron
Trim Material	Stainless Steel
End Connections	Grooved
Function	Automatically reduces a higher upstream pressure to a lower downstream pressure and maintains the downstream pressure at a relatively constant level.