Troubleshooting - Series 776 Low-Pressure Actuator; Troubleshooting - Series 746-Lpa Dry Accelerator; Troubleshooting - System - Victaulic FireLock 756 Series Installation, Maintenance, And Testing Manual

installation, Maintenance, and testing Manual
firelock european dry valve stations
®
series 756
WitH series 776 loW-Pressure actuator
trouBlesHooting – series 776 loW-
Pressure actuator
ProBleM
When the Auto Vent Sleeve of the Series 776 Low-Pressure Actuator
is pulled up, the screw does not stay set in the "UP" position.
Water is leaking through the Series 776 Low-Pressure Actuator.
No water is passing through the Series 776 Low-Pressure Actuator.
trouBlesHooting – series 76-lPa dry
accelerator
ProBleM
The valve operates without sprinkler activation.
The Series 746-LPA Dry Accelerator does not operate within a 0.3-Bar
pressure drop in system air pressure.
The Series 746-LPA Dry Accelerator does not set up properly (cannot
get pressure on the upper gauge, and the button pops up immedi-
ately when pressure is introduced).
trouBlesHooting – systeM
ProBleM
The valve operates without sprinkler activation.
Water is leaking from the drip check located in the alarm line.
Air is leaking from the drip check located in the alarm line.
The clapper will not latch closed.
Water is leaking from the vent hole in the piston assembly.
Air is leaking from the vent hole in the piston assembly.
t
www.victaulic.com
Victaulic is a registered trademark of Victaulic company. © 2006 Victaulic company. all rights reserVed. printed in the usa.
rev_B
PossiBle cause
The Series 776 Low-Pressure Actuator is not receiving enough air.
The Series 776 Low-Pressure Actuator has a broken seal.
The air chamber of the Series 776 Low-Pressure Actuator is not set.
The strainer on the Series 776 Low-Pressure Actuator is clogged.
The Series 776 Low-Pressure Actuator has a ripped diaphragm.
The strainer on the diaphragm charge line is clogged.
PossiBle cause
There is a loss of air pressure in the lower inlet chamber of the Series
746-LPA Dry Accelerator.
System air pressure exceeds 2 Bar
There is a loss of air pressure in the upper air chamber of the Series 746-LPA
Dry Accelerator.
The air decay rate of the system is too slow.
The Series 746-LPA Dry Accelerator is installed upside-down.
PossiBle cause
There is a loss of air pressure in the system or trim.
The pressure switch on the air compressor is set too low, or the compressor
is not operating properly.
Water is getting past the clapper seal and into the intermediate chamber
of the valve.
Water is under the clapper seal.
Air is getting past the clapper seal and into the intermediate chamber of
the valve.
Water is under the clapper seal.
There is no water pressure on the diaphragm.
The Auto Drain is not set.
The diaphragm in the piston is damaged.
The piston rod seal is damaged.
i-756lPa.vds
solution
Increase the air pressure going into the Series 776 Low-Pressure Actuator.
If the above procedure does not work, contact Victaulic.
Make sure the vent seal of the Series 776 Low-Pressure Actuator is in the
set position and the air chamber is pressurized.
Replace the strainer screen of the Series 776 Low-Pressure Actuator. Refer
to the instructions on page 30.
If water still leaks through the Series 776 after performing the above
procedures, contact Victaulic.
Disassemble and clean the diaphragm charge line strainer. Refer to the
applicable trim drawing for details.
solution
Check for air loss at the lower chamber seal. If a leak is present, turn the
adjustment nut counterclockwise to seal.
Check for any leaks in the system and trim. Confirm that the AMTA is
operating properly.
Decrease system air pressure.
Apply soapy water to all joints around the Series 746-LPA Dry Accelerator
to check for leaks. Repair any leaks and re-test.
Make sure there are no restrictions in the remote system test valve
(inspector's test connection).
If the above procedures do not work, contact Victaulic.
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).
solution
Check for any leaks in the system and trim. Confirm that the AMTA is
operating properly. Consider installing a low-air supervisory switch.
Increase the "ON" setting of the air compressor's pressure switch, and check
the air compressor for proper operation.
Check the clapper seal and valve body seat ring for physical damage and
foreign material.
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 instructions on page 32.
Check the clapper seal and valve body seat ring for physical damage and
foreign material.
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 instructions on page 32.
Check the water pressure in the diaphragm charge line. Make sure the
restrictor in the diaphragm charge line is clean.
Set the Auto Drain by pulling up on the Auto Drain Sleeve.
Contact Victaulic.
Contact Victaulic.
i-756lPa.vds_31