Individual Door Alarm Installation - Single Wire
(1) Find an appropriate location for the installation of each DCU box required for the door
alarm system. Each building should have its own DCU box. Large buildings having
more than one hundred units may require more than one DCU box. Although the DCU
enclosures are rainproof and the boxes may be mounted outdoors, use indoor
mounting if available. Above the entrance door to a building with hallway access
makes an ideal location.
(2) Mount each DCU box by removing the door and sinking screws or bolts through the
four box mounting holes into the wall. Take care not to damage the circuit board during
the mounting process. If you must drill to mount the box, do not allow metal fragments
to become lodged on the circuit board.
(3) Install single gang electrical junction boxes in each unit at a convenient location above
the door near where the door switch will be mounted. Route the three conductor cable
from the DCU box to the first single gang box and make a six inch loop of slack wire in
the junction box. Continue through the second and all other junction boxes in order
making the same six inch loop of slack wire in each junction box. Route the wire in
whatever order allows the total wire length to be kept to a minimum.
Mount the magnet on each door and the switch parallel to the magnet approximately
one inch away when the door is closed. Roll up style doors often require the use of a
mounting bracket for the switch. The magnet may be either bolted to the door using the
two mounting holes or glued using a panel adhesive.
(4) Install the DIU board at each door with
the connections as shown in Figure
Sixteen. Wire terminations to the DIU
board require that the installer use a
crimping tool to connect a 0.187 inch
"quick connect" to each wire so that it
may be plugged on to the DIU circuit
board. There are two connection points
on the end of the DIU board to which
the door switch should be connected.
There are then three connection points
remaining on each side of the board
for the three conductor door to door
wire. The side labeled "Toward DCU"
should hook to the wire running toward
the DCU box. The side labeled "From
Doors" should hook to the wire running
to the next farther unit from thr DCU box. Three conductor cable typically contains a red
conductor, a black conductor, and a white conductor. The colors should be hooked up
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