DS1520/30 Installation Instructions
Copyright © 1995-97 Detection Systems, Inc.
Page 5
- Define the location of the VS A7 on the mounting surface.
- Remove irregularities on the mounting surface to guarantee proper
connection.
- Mark the mounting holes “B”. Prepare to drill and tap the holes.
- Drill out these three holes with a # 29 (3.3mm) drill bit in a high speed
drill. Drill the holes at least 1/4 inch (7mm) deep.
- Thread these three holes with a 8/32 (M4) tap. Use a little oil to lubri-
cate the tap while going through the hole. After threading the holes,
use a 1/2 inch (12mm) drill bit or countersink in a high speed drill to
smooth the surface around the holes and to remove burrs.
- Mount the VS A7's backplate to the mounting surface.
- If more space is needed to get the steel lever over the keyhole, VS A8
spacer plates may be used.
- When done, always mechanically test the proper function of the re-
lease lever, the keyhole protection lever, and the microswitch.
6.1.4 Recess Mounting with the VS A2
The VS A2 is designed to recess mount the detector in concrete walls.
Preferably, the recess box should be molded into the wall during construc-
tion of the vault.
• Define exactly where the locations of the detectors will need to be (do not
forget floors and ceilings).
- Make arrangements with the construction crew to be on-site when they
put up the concrete casting shutters (wooden panels).
- At the predetermined mounting sites, drill two holes in the wooden
panels.
- Mount the recess box to the wooden panels using the two threaded
rods provided for each installation.
- Fasten the bracket in the tapered hole in the back of the mounting box.
Weld rods to
reinforcement b ars
- Weld the bracket to the reinforcement rods for the concrete.
- Run conduit to the holes on the sides of the mounting box.
- Attach the conduit to the reinforcement rods. This will prevent them
from shifting or falling out during pouring of the concrete.
- Seal the holes around the conduit and any hole not being used. This
will prevent concrete from running into the box.
- After the concrete has been poured and VS A2 recess box is accessi-
ble again, mount the detector on a VS A1 mounting plate, then mount
the assembly inside the box.
6.1.5 Surface Mounting with the VS A3
The VS A3 is a box designed to protect the detector from damage and
excess humidity.
A
A
A
B
C
Place rubber
gasket between
the box and the
cover
To make the box weather resistant:
• Apply silicone insulation to all joints, mounting hardware, and holes.
• After the detector and box have been mounted and tested, apply silicone
insulation around the edges of the box lid and cover before and after it
has been secured.
6.1.6 Using a VS A5 Floor Box
The VS A5 is designed to recess mount the detector in vault floors.
It may be used as a casting mold in new vault constructions. It may also
be used in existing vaults after cutting a hole in the vault floor.
The VS A5 features a heavy duty lid (1/5 inch thick) to accommodate
heavy loads that may exist inside bank vaults. The cable conduit inlets are
rubber sealed to prevent water intrusion.
Weld Brackets to
reinforcement bars
To ensure proper detection, weld the VS A5 to the reinforcement bars
within the concrete. This is done by mounting the L-shaped flat iron rod to
the bottom of the mounting box, then welding this piece to the reinforce-
ment rods.
5.1.7 Using the VS A9 Armored Cable Kit
The VS A9 is designed to be used as a protective transfer of cable from the
door of a safe/vault to its body or an adjacent wall. It should be used togeth-
er with the VS A10 Junction Box.
The kit includes the following:
- eight core cable, 6.6 feet (2 m) long
- flexible stainless steel conduit
- protective ferrules
- cable strain reliefs
- cable clamp bolts
- plastic cable entry for two conduits (VS A13)
• The protective ferrules are used on the two ends of the steel conduit. This
will protect the cable from the sharp edges.
• The steel cable strain reliefs are used to secure the conduit within the
detector (replace the plastic strain relief on the detector with the steel
one).
• The plastic cable entries fit in the cover of the detector. The two holes are
made to fit the stainless steel conduit. A third knockout is available if
needed.
5.1.8 Using the VS A10 Junction Box
The VS A10 is a tamper resistant Junction Box. It has a hardened steel
insert within the cover to protect it from drilling; it has a sabotage contact to
protect it from being opened or removed from its mounting surface.
It contains two lines of connections on a PC board with a total of 32 termi-
nals.
