Irritrol Total Control-R Series - Manual (Page 8)

6
HOW THE SENSOR FEATURE WORKS
The Total Control is equipped to operate with an optional rain
sensing device (rain switch) to prevent automatic controller operation
during rain.
The rain switch is a simple device, typically installed on a roof
overhang or stationary structure exposed to rainfall and full sun, and
shielded from irrigation spray.
When rain occurs, the normally-closed rain switch senses the moisture
and opens the valve common circuit, effectively preventing all output
to the field. The electronic programming portion of the controller is
isolated from the rain sensor switch, and continues to operate as
programmed. When rain stops and the rain switch returns to its
normally-closed state, the valve common circuit is restored, enabling
watering to resume as scheduled.
A two-position sensor switch (see item 18 on page 3) is provided to
enable you to easily bypass operation of the the rain switch at any
time. If you choose to disregard rain switch input, place the
SENSOR
switch in the Bypass position. To enable rain switch operation, place
the Sensor switch in the Active position.
IMPORTANT: If a rain switch is NOT connected to the
controller, the
SENSOR switch MUST be in the BYPASS
position to enable controller operation.
The controller will not operate automatically or manually if the
SENSOR switch is in the ACTIVE position without a rain switch
connected.