Wattstopper

®

Occupancy and Light Level Sensor for Indoor/Outdoor Use

Line Voltage • Fixture Mount

Installation Instructions • Instructions d’Installation • Instrucciones de Instalación

No: 24044 – 02/18 rev. 1

Catalog Numbers • Les Numéros de Catalogue • Números de Catálogo: FS-355

Country of Origin: Made in China • Pays d’origine: Fabriqué en Chine • País de origen: Hecho en China

SPECIFICATIONS

Factory Setting ...............................................15 minutes

Light Level, Hold OFF ....... minimum <10fc, maximum >120fc

Factory Setting .............................maximum (never hold)

Wiring Terminals .......................................................Hot, neutral, load

Use Copper Conductor Only .........................18AWG-14AWG

Torque Rating ................................4.428 inch-pound. (0.5Nm)

Coverage

FS-L2W Lens @ 8’ height ....................................48’ diameter

FS-L3W Lens @ 20’ height ..................................40’ diameter

FS-L6 Lens @ 8’ height........................................60’ diameter

Body ......... 1.38” x 2.35” x 0.88” (35mm x 59.5mm x 22.7mm)

DESCRIPTION AND OPERATION

The FS-355 occupancy sensor turns lighting ON and OFF based on occupancy and ambient light levels. The light level feature (can be

used to keep lights from turning ON and turn them OFF if the ambient light level is sufficient. This slim, low-profile sensor is designed for

installation inside the bottom of a light fixture body. The PIR lens connects to the FS-355 through a 11/8” diameter hole in the bottom of

the fixture.

The sensors use passive infrared (PIR) sensing technology that reacts to changes in infrared energy (moving body heat) within the

coverage area. Once the space is vacant and the time delay elapses, lights will turn OFF. Sensors must directly “see” motion of an

occupant to detect them, so careful consideration must be given to sensor placement. Avoid placing the sensor where shelving or other

obstructions may block the sensor’s line of sight.

See the FS-LxW Lens Module Coverage Guide for a description of the available coverage patterns.

FS-355

FS-LxW Lens

(sold separately)

NOTE: OPEN DEVICE for installation in a Listed Enclosure per Installation Instructions.

1. Determine an appropriate mounting location inside the light fixture. Allow a minimum distance of 1.3” (33mm) from the center of

2. Use a 11/8” (29mm) bit to drill a hole through the sheet metal in the bottom of the fixture.

WIRING A SINGLE SENSOR

TURN THE POWER OFF AT THE CIRCUIT

BREAKER BEFORE WIRING.

LIGHT LEVEL FEATURE

The Light Level feature holds OFF and turns OFF lights when the space is occupied and adequate ambient light exists. When the light

level drops below the set level it will turn the lights ON when the space is occupied. A sticker covers the photosensor and must be

removed before this feature will function. The factory setting is for maximum, meaning that even bright ambient light will not cause the

sensor to hold the lights OFF if it detects occupancy in the controlled area.

Set the light level when the controlled light would normally be turned OFF

due to the presence of sufficient daylight or other electric light. (If this feature

is not needed, leave the sticker in place.

* At the maximum setting, the light level entering the photosensor must

exceed 120fc, which only happens in rare applications or when the lens is

removed.

Test Occupancy Sensor

1. If sticker has been removed, set Light Level to maximum (fully

2. Enter the controlled area and lights should remain OFF. Make sure your body does not cast a shadow on the sensor.

3. Turn the light level trimpot clockwise in small increments. After each adjustment, put the lens back on the sensor then move about

4. Continue this procedure until the lights turn ON. At this setting the lights will not turn ON with occupancy if the light level is above

5. Set the time delay to the desired setting. The time delay can be set from 30 seconds (fully counterclockwise) to 30 minutes (fully