COMPRESSOR REQUIREMENTS AND SETTINGS FOR SERIES 756
FIRELOCK DRY VALVES INSTALLED WITH SERIES 746-LPA DRY
ACCELERATORS
Set the air regulator of the Series 757 Regulated AMTA to 0.9 Bar.
THE SERIES 757P AIR MAINTENANCE TRIM ASSEMBLY WITH
PRESSURE SWITCH MUST NOT BE USED ON A SERIES 756
FIRELOCK DRY VALVE INSTALLED WITH A SERIES 746-LPA DRY
ACCELERATOR.
When a Series 756 FireLock Dry Valve is installed with a Series 746-
LPA Dry Accelerator, the Series 757 Regulated AMTA must be used.
NOTE: The use of an air regulator with a base or riser-mounted com-
pressor could cause short cycling, resulting in premature wear of the
compressor.
In t
he event a compressor becomes inoperative, a properly sized tank-
mounted air compressor provides the greatest protection for systems
installed with a Series 746-LPA Dry Accelerator. In this situation, air can
be supplied continuously to the sprinkler system for an extended time
period. NOTE: The Series 757 Regulated AMTA should be used with a
tank-mounted air compressor that supplies air to a Series 756 FireLock
Dry Valve installed with a Series 746-LPA Dry Accelerator.
The air regulator of the Series 757 Regulated AMTA is a relief-type
design. Any pressure in the system that is above the set point of the air
regulator will be released. Therefore, charging the air regulator above
the set point could cause premature operation of a valve installed with a
Series 746-LPA Dry Accelerator.
SETTINGS FOR AIR SUPERVISORY PRESSURE SWITCHES AND
ALARM PRESSURE SWITCHES
1. Air supervisory pressure switches are required for dry systems and
must be set according to the following notes.
1a. Wire the air supervisory pressure switches to activate a low-
pressure alarm signal. NOTE: In addition, the local author-
ity having jurisdiction may require a high-pressure alarm.
Contact the local authority having jurisdiction for this require-
ment.
1b. Set the air supervisory pressure switches to activate at 0.1
– 0.3 Bar below the minimum air pressure required (but not
lower than 0.7 Bar).
1c. Wire the alarm pressure switch to activate a water flow alarm.
1d. Set the alarm pressure switch to activate on a pressure rise of
0.3 – 0.6 Bar.
REMOTE SYSTEM TEST VALVE REQUIREMENTS
The remote system test valve (inspector’s test connection) should
contain an approved valve (normally closed), which can be opened to
simulate the operation of a sprinkler.
The remote system test valve (inspector’s test connection) should be
located at the most hydraulically demanding location in the release
system. NOTE: Multiple restrictions on the remote system test valve
(inspector’s test connection) may slow the air decay rate and cause the
system to respond slower than required.
The remote system test valve (inspector’s test connection) should termi-
nate with an orifice equal to the smallest orifice in the releasing system.
The remote system test valve (inspector’s test connection) is used to
ensure that water reaches the most remote part of the system within 60
seconds.
IMPORTANT INSTALLATION INFORMATION
1 For proper operation and approval, the Series 756 FireLock Dry
Valve must be installed in accordance with the specific trim
diagrams included with the shipment. NOTE: Victaulic provides
specific trim diagrams for installations involving a Series 746-LPA
Dry Accelerator.
2. Before installing the Series 756 FireLock Dry Valve, flush the water
supply piping thoroughly to remove all foreign material.
3. Series 756 FireLock Dry Valves MUST NOT be located in an area
where the valve can be exposed to freezing temperatures. In addi-
tion, the Series 756 FireLock Dry Valve MUST NOT be located in
an area where physical damage may occur.
4. It is the system designer’s responsibility to confirm material com-
patibility of the Series 756 FireLock Dry Valve, trim, and associated
accessories when a corrosive environment or contaminated water
is present.
5. SERIES 756 FIRELOCK 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.
Air supplies must be regulated, restricted, and continuous. NOTE:
Victaulic recommends the use of the AMTA on any system with an
automatic air supply.
8. When the Series 756 FireLock Dry Valve is used with a water
motor alarm, Victaulic recommends the use of an uninterrupted,
low-pressure alarm that is installed on the piston charge line down-
stream of the check valve. Another option is to install a Series 75B
Supplemental Alarm Device.
9. Piping must be pitched so that systems can drain properly. For
areas that are subject to high levels of condensation, or where
piping is not properly pitched, an optional Series 75D Water
Column Device kit is available to assist in automatically draining
water out of the riser.
I-756LPA.VDS_9
FireLock
®
European Dry Valve Stations
SERIES 756
WITH SERIES 776 LOW-PRESSURE ACTUATOR
I-756LPA.VDSINSTALLATION, MAINTENANCE, AND TESTING MANUAL
www.victaulic.com
VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2006 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA.
REV_B
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