Unit Description And Operation - wattstopper WS-250 Installation Instructions Manual

UNIT DESCRIPTION AND OPERATION

The WS-250 and WS-250-347 PIR Wall Switch Occupancy Sensors turn lighting
or fan loads ON and OFF based on occupancy and ambient light level. They are
designed to replace a standard light switch. The WS-250 operates with 120 or
277VAC line voltage and the WS-250-347 operates with 347VAC line voltage. All
other features are the same in both models. (Throughout this manual, "WS" is
used to indicate either sensor.)
The sensor uses passive infrared technology to sense human motion, and
defines it as occupancy. A green LED on the sensor blinks upon occupancy and
then resets. It will blink again when it detects motion after the 2-second reset.
The sensor turns ON the load automatically when it detects occupancy.
Once the space is vacant and the time delay elapses, it turns OFF the load
automatically.
If adequate ambient light is already present in the area, the sensor will hold
OFF the load it controls. When the light drops below a field selectable level and
the sensor detects occupancy, the sensor turns ON the load. Once turned ON,
the load remains ON until the space is vacant or the light level rises above the
setpoint and the time delay expires.
Manual Operation: The occupant can press the ON/OFF button to turn the
load ON and OFF. When the load is turned OFF or ON manually, it stays OFF or
ON as long as the sensor detects motion. After no motion is detected for the
length of the time delay, the
sensor goes back to automatic
operation. If the load was ON,
it turns OFF. The next time
the sensor detects occupancy
and the ambient light is lower
than the set level, the sensor
automatically turns ON the load.
Walk-test feature:
When the Time Delay trimpot
is in the fully counterclockwise
position, the sensor has a 30
second time delay and the Light
Level function is disabled. This
allows you to quickly check the
sensor coverage area.
Service function:
In the event of unit failure or if
it is necessary to leave the load
ON, remove the Service Jumper plug. This disables all automatic ON and OFF
functions and the load can only be operated using the ON/OFF button.
Call 800.879.8585 for Technical Support
ON/OFF
Switch
Service
Jumper
(L) Light Level
(T) Time Delay
(S) Sensitivity
LED
Fresnel Lens
Maximum = clockwise
Minimum = counterclockwise
Press down
on tab and
pry off Cover
ON/OFF Button
(Switch Cover)