Series 756 FireLock
®
European Dry Valve Stations
27
Troubleshooting
TROUBLESHOOTING – SERIES 753-A DRY ACTUATOR/ANTI-FLOOD DEVICE
TROUBLESHOOTING – SERIES 746 DRY ACCELERATOR
TROUBLESHOOTING – SYSTEM
Problem
Possible Cause
Solution
Air leaks from the upper chamber seal while pushing down on the
auto vent during setup.
The adjustment nut on the vent seal is set too low.
While the system is pressurized with air, pull up on the auto vent. Turn
the adjustment nut under the vent seal clockwise 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.
Vent seal is torn.
Contact Victaulic.
After the dry actuator is set and the auto drain set screw is pulled up,
water leaks through the lower chamber while the piston charge line is
pressurizing.
The adjustment nut on the vent seal is set too high.
Turn the adjustment nut under the vent seal clockwise until it r eaches
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, tur n
the vent seal 1/8 of a turn more counterclockwise.
Lower seat/water seal is damaged.
Contact Victaulic.
Air leaks out of the waterside drain of the dr y actuator.
Torn diaphragm.
Contact Victaulic.
Cannot pressurize the air side of the dry actuator.
Blockage in airline.
Remove and clean the airline strainer and the 1,6-mm airline r estrictor.
Problem
Possible Cause
Solution
The system valve operates without sprinkler
activation.
Loss of air pressure in the lower inlet chamber.
Check for air loss at lower chamber seal. If a leak is present, turn adjustment nut counterclockwise to seal.
Check for any leaks in system and trim. Confirm proper operation of air maintenance device.
The dry accelerator does not operate within a
0,3-Bar pressure drop in system air pressure.
Loss of air pressure in the upper air chamber of the
dry accelerator.
Apply soapy water to all dry accelerator joints, and check for leaks. Repair any leaks and r e-test.
Air decay rate of system is too slow.
Make sure there are no restrictions in the inspector’s test connection.
If the above procedures do not work, contact Victaulic.
The dry accelerator does not set up properly
(cannot get pressure on the upper gauge, and
the button pops up immediately when pressure
is introduced).
Dry accelerator is installed upside down.
Remove the dry accelerator from the trim, and turn the unit around so that the button is facing down (toward the
dry actuator).
Problem
Possible Cause
Solution
The valve operates without sprinkler activation.
There is loss of air pressure in the system or trim.
Check for system leaks. Confirm proper operation of the air
maintenance device. Consider installing a low-air supervisor y switch.
The pressure switch on the air compressor is set low, or the compressor
is not operating.
Increase the "ON" setting on the pressure switch, and check the
compressor for proper operation.
Water leaking from the restricted orifice/automatic drain.
Water is getting past the clapper seal and into the inter mediate
chamber.
Check the clapper seal and valve body seat ring for physical damage
or foreign material.
Water is under the clapper seal.
Inspect the clapper to make sure no water is under the seal. If water is
present, remove and replace the seal, per the instructions on page 23.
Air leaking from the restricted orifice/automatic drain.
Air is getting past the clapper seal and into the inter mediate chamber. Check the clapper seal and valve body seat ring for physical damage
or 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, per the instructions on
page 23.
The clapper will not latch closed.
There is no air pressure on the dry actuator.
Refer to the “Troubleshooting” section for the Series 753-A Dr y
Actuator.
There is no water pressure on the piston.
Check the water pressure in the piston charge line.
The auto drain is not set.
Set the auto drain.
Water is leaking from the piston assembly.
The diaphragm is damaged.
Rebuild or replace the piston assembly.
Air is leaking from the piston assembly.
The piston rod seal is damaged.
Rebuild or replace the piston assembly.
