TECHNICAL DATA
MODEL VXD SINGLE-
INTERLOCKED PREACTION
SYSTEM WITH ELECTRIC
RELEASE
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Telephone: 269-945-9501 Technical Services: 877-384-5464 Fax: 269-818-1680 Email: techsvcs@vikingcorp.com
Visit the Viking website for the latest edition of this technical data page www.vikinggroupinc.com
Page 5 of 13
Form No. F_051820 21.01.01 Rev 21.1
5.3 In trouble conditions:
If a sprinkler opens prior to operation of the detection system, or any time supervisory pressure in the sprinkler piping is lost,
the air supervisory switch will signal a low air pressure condition, but the deluge valve will NOT open. If the detection system
operates due to mechanical damage or malfunction, the deluge valve will open, but the water will be contained in the sprinkler
piping. The water motor alarm and alarms connected to the alarm pressure switch will activate.
5.4 Manual operation:
Anytime the emergency release is pulled, pressure is released from the priming chamber and the deluge valve will open. Water
will flow into the system piping and alarm devices. Water will flow from any open sprinklers and/or spray nozzles on the system.
6. INSTALLATION
Refer to current Viking Technical Data describing individual components of the Viking VXD Deluge System. Also, refer to applicable
installation standards, codes, and Authorities Having Jurisdiction.
6.1 Important Settings
1. Recommended supervisory pressure in the closed sprinkler piping is 20 PSI (1.4 bar):
a. Where supervisory pressure is maintained at 20 PSI (1.4 bar), set the air supervisory switch to activate at 15 PSI (1.03
bar) on pressure drop.
b. The air supervisory switch should be wired to activate a supervisory alarm to signal a "low air" pressure condition.
Activation of an alarm to signal a high pressure condition may be required. Refer to applicable installation standards and
the Authority Having Jurisdiction.
NOTE: Installation Standards may allow supervisory pressures lower than those recommended above. When
using supervisory pressures lower than the recommended setting noted above, verify that the air regulation
equipment and air supervisory switches used are compatible with the supervisory pressure setting used.
2. Alarm pressure switch should activate when pressurized to 4 to 8 PSI (.3 to .6 bar) on pressure rise. Alarm pressure switch
should be wired to activate the water flow alarm.
6.2 Air Supply Design
The air supply compressor should be sized to establish total required air pressure in 30 minutes. The air supply must be
regulated, restricted, and maintained automatically. The air maintenance device is used to regulate and restrict the flow of
supervisory air into the sprinkler system piping.
The air supply must be regulated to maintain the pressure desired in the release system. Pressure settings other than those
recommended in section 6.1 above may affect operation of the system. The air supply must be restricted to ensure that the
automatic air supply cannot replace air as fast as it escapes when a releasing device operates.
Riser Mounted Air Compressors:
A riser mounted air compressor may be suitable for small electrically operated single-interlocked preaction systems; however,
placement of a dehydrator and/or an air maintenance device in the outlet piping of a riser mounted air compressor may affect
operation of the compressor.
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