5
Opening Unit
Remove the four plastic screws to open the unit. The printed circuit board
contains static sensitive parts, so the installer should wear a grounding strap
when handling the board.
Enclosure Mounting
IMPORTANT:
This unit contains two enclosures. The larger one contains the
electronics (VAS - 4) and the smaller one contains the sensor. The two
enclosures are permanently connected together by a low voltage wire. The
sensor enclosure contains an oil based protection device that is filled with a
special fluid. The protection device has a cap over the ¼" fitting to prevent the
oil from leaking out during shipping and installation.
THE SENSOR
ENCLOSURE MUST BE MOUNTED IN AN UPRIGHT POSITION TO
PREVENT THE FLUID FROM LEAKING OUT.
Once the unit is securely
mounted in an upright position, the cap over the ¼" fitting can be removed.
The recommended mounting method for the VAS - 4 is to use four mounting
holes located where the 4 plastic screws are that hold down the lid. Use the
box as a template for mounting (see Fig. 2).
NOTE: THE VAS - 4 SHOULD NOT BE MOUNTED WHERE SUNLIGHT
CAN DIRECTLY ENTER THE TRANSPARENT COVER.
The printed circuit board is designed to have power come ln from the bottom
of the box. Remove the knockouts that are needed for power entry. Two
watertight fittings are provided for the power and alarm line. If the board must
be removed to install a watertight fitting, care must be taken in handling the
board.
NOTE: IF YOU RUN CONDUIT INTO THE BOX AND DO NOT USE THE
WATERTIGHT FITTINGS, YOU MUST USE A SEALANT TO SEAL
AROUND THE CONDUIT CONNECTION
.
Install the printed circuit board after the connectors have been installed. Use
the four #6 screws provided to mount the board in the box and tighten only to
a snug fit.
DO NOT OVER TIGHTEN (see Fig. 2)
