Series 756 FireLock
®
European Dry Valve Stations
9
Air Supply Design
1.
The engineer/system designer is responsible for sizing the
compressor so that it brings the entire system to the required
pressure.
DO NOT
oversize the compressor to provide more air-
flow, since it will slow down or possibly prevent valve operation.
2.
Continuous service (24 hours per day, 7 days per week) is
required to prevent the valve from false tripping due to loss of air
pressure.
3.
Regulate the air pressure to the proper system air pres-
sure. Air pressure differing from the required system air pressure
could adversely affect system operation.
4.
Restrict the air supply to ensure that air being exhausted
from an open sprinkler or manual release valve is not replaced
by the air supply system as fast as it is being exhausted.
5.
Recommended practice is to provide an inspector’s test
connection on the release system. The inspector’s test connec-
tion is used to ensure that water gets to the most remote part of
the system within the required time.
5a.
The inspector’s test connection should contain a globe
valve (normally closed), which can be opened to simulate the
actuation of a sprinkler head.
5b.
Locate the inspector’s test connection at the most hydrau-
lically demanding location in the release system.
NOTE:
Multiple
restrictions on the inspector’s test may slow the air decay rate,
causing the system to respond slower than required.
5c.
The inspector’s test connection should terminate with an
orifice equal to the smallest orifice in the releasing system.
6.
When shop air or a tank-mounted air compressor is
installed, an approved air maintenance device
MUST
be used.
The air maintenance device provides proper air regulation to the
sprinkler system.
Proper Air Supplies for Series 756 Dry Valves Used
with Series 753-A Dry Actuators Only:
1.
When a riser or base-mounted air compressor supplies air
to a system using a Series 753-A Dry Actuator, it is not neces-
sary to use the air maintenance device with an air regulator. In
this case, the airline of the compressor connects to the trim at
the fitting where the air maintenance trim is normally installed
(refer to the trim drawing).
2.
Due to the large on/off differential available for pressure
switches that control base-mounted compressors, adjust the
compressor’s pressure switch so that the “ON” contact is at the
recommended air supply for the valve.
Proper Air Supplies for Series 756 Dry Valves Used
with Series 753-A Dry Actuators and Series 746 Dry
Accelerators:
1.
When a Series 746 Dry Accelerator is installed with the Se-
ries 753-A Dry Actuator, an air maintenance device MUST be
used with the air regulator.
NOTE:
The use of an air regulator
with a base or riser-mounted compressor could cause short cy-
cling, resulting in premature wear or failure of the compressor.
2.
In the event a compressor becomes inoperative, a proper-
ly sized tank-mounted air compressor provides the greatest pro-
tection for systems that contain a Series 746 Dry Accelerator. In
this situation, air can be supplied continuously to the sprinkler
system for an extended time period.
IMPORTANT INSTALLATION INFORMATION
1.
For proper operation and approval, the Series 756 Dry
Valve must be installed in accordance with Victaulic specifica-
tions.
NOTE:
Victaulic provides specific trim drawings for instal-
lations that involve a Series 746 Dry Accelerator.
2.
Before installing the Series 756 Dry Valve, flush the water
supply piping thoroughly to ensure that no foreign material is
present.
3.
The Series 756 Dry Valve
MUST NOT
be located in an
area where the valve is subject to freezing temperatures or phys-
ical damage.
4.
It is the owner’s responsibility to confirm material compat-
ibility of the Series 756 Dry Valve, trim, and associated accesso-
ries when a corrosive environment or contaminated water is
present.
5.
SERIES 756 DRY VALVES MUST BE INSTALLED ONLY
IN THE VERTICAL POSITION WITH THE ARROW ON THE
BODY POINTING UPWARD.
6.
Air or nitrogen supply to the dry piping system must be
clean, dry, and oil-free.
7.
Automatic air supplies or shop air must be regulated, re-
stricted, and continuous.
NOTE:
Victaulic recommends the use
of an air maintenance device on any system with an automatic
air supply.
WARNING
• Air supply systems must be properly sized.
Failure to follow this instruction could cause improper valve operation,
resulting in serious personal injury and/or property damage
