Wattstopper
®
Ultrasonic Multi-Way Vacancy Sensor
Installation Instructions • Instructions d’Installation • Instrucciones de Instalación
No: 24302 – 09/16 rev. 1
Catalog Number • Numéro de Catalogue • Número de Catálogo: CU-250
Country of Origin: Made in China • Pays d’origine: Fabriqué en Chine • País de origen: Hecho en China
SPECIFICATIONS
Voltage .....................................................120VAC, 60Hz
Load
Incandescent or fluorescent ................ 0-600 Watts
Fan motor ..................................................... 1/6 hp
Time Delay Adjustment .... 15 sec., 5 min., 15 min., 30 min.
Sensor Technology .......................................... Ultrasonic
Frequency .................................................... 40KHz
Environment ........................................... Indoor use only
Operating Temperature .......32° to 122°F (0° to 50°C)
Tools Needed
Insulated Screwdriver
Wire Strippers
DESCRIPTION AND OPERATION
CU-250 Ultrasonic Multi-Way Vacancy Sensors are
designed to replace standard single pole and multi-
way (3-way, 4-way) switches. They are ideal for any
indoor space where vacancy sensor-based controls
with manual
ON/OFF
capability are desirable
and where detection with passive infrared (PIR)
technology wall switch sensors is inappropriate. For
instance, in an L-shape room or an area filled with
multiple blocking objects. Unlike PIR wall switch
sensors, ultrasonic wall switches do not rely on
clear line of sight to detect human motion. They
emit and receive harmless low power ultrasonic
waves that allow detection throughout an enclosed
area, regardless of its shape.
Like standard switches, you can press the
ON/OFF
button to turn the light or fan (controlled load)
ON
and
OFF
. Unlike standard
switches, the CU-250 automatically turns
OFF
the controlled load after the coverage area has been vacant for a period of time (Time
Delay). If motion is detected within 30 seconds after it automatically turns
OFF
, the CU-250 automatically turns the load back
ON
.
The CU-250 can be wired with up to three additional CU-250s for multi-way
Manual ON/Auto OFF
of one or several loads (up to one
load connected to each CU-250). It can also be wired to up to four RH-253 single pole momentary wall switches for multi-way
Manual-ON/OFF Automatic-OFF
control of one load.
Lighted Switch
To help you locate the CU-250 in a dark room, the amber LED illuminates the
ON/OFF
button while the controlled load is
OFF
. When
the controlled load is
ON
, the LED is
OFF
.
Time Delay
The time delay can be selected by the user during set up. It can be adjusted to any of
these fixed values:15 seconds/5 minutes/
15 minutes/30 minutes. We recommend that the time delay be the same in all sensors
related to the same load. For additional information on how to adjust it, please read
the SENSOR ADJUSTMENT section of this installation manual.
Ultrasonic Sensitivity Level
The ultrasonic detection sensitivity can be adjusted by the user from minimum
(approximately 40%) to maximum (100%) during set up. Factory setting is
approximately 70% . To adjust the ultrasonic sensitivity level, please read the
SENSOR ADJUSTMENT section of this installation manual.
Coverage Area
The CU-250 ultrasonic detection covers an area of 15' x 15' for minor (hand) motion,
and an area of 20' x 20' for major (walking) motion. For coverage pattern refer to
Fig.1.
For best performance, use in enclosed spaces not larger than 15' x 15'.
Depending upon obstacles such as furniture, the area of coverage may be less or
more than the sensing distances shown in the coverage pattern.
15’
(4.5m)
20’
(6.1m)
Major
Motion
Minor
Motion
7.5’
(2.2m)
10’
(3.0m)
Major Motion (walking motion)
Minor Motion (hand motion)
Fig. 1: Sensor Coverage
