Control Manual

23
CONNECTING A RAIN SWITCH SENSOR
The Total Control is designed for use with a normally-closed rain
sensor or “Rain Switch.” (Refer to page 6 for additional important rain
switch information.)
To connect the rain switch sensor:
1. Route the two wires from
the sensor into the cabinet
through the field wire
access opening.
2. Connect the wires to the
“
SENSOR” terminals in
either order. See Figure 7.
Note: Refer to the
installation instructions
provided with the sensor
for additional information.
CONNECTING AN EARTH GROUND
A power surge is a sudden rise in voltage on the power main line. It is
then often followed by a drop in voltage as the power line equipment
tries to protect area users. A lightning strike on the power grid is the
most common cause of power surges and can be damaging to the
controller. Surge protection is built into the Total Control PC board
to reduce the potential for surge damage by shunting the voltage to
earth ground. Therefore, an important step in the installation process
is to properly connect the controller to an earth ground source,
especially if the controller is located in a lightning-prone area.
Caution: The built in surge protection components cannot
effectively protect the controller circuitry from power surge unless
properly connected to an earth ground source.
To connect an earth ground:
1. Route a 12–16-gauge (2.0–1.0mm
2
) solid copper wire in the most
direct path from the “
EARTH GND” lug, located on the controller’s
terminal board (see item 21 on page 3), to an earth ground source
such as metal (not plastic) water pipe or copper-clad ground rod.
2. Clamp the bare wire securely to the pipe or ground rod. Make sure
the wire contact area is free of dirt and corrosion.
ACTIVE
24V
AC
G
N
D
BYPASS
SENSOR
SENSOR
V
E
S
T
Figure 7
Normally Closed
Rain Switch
Sensor
Installation Procedures