& Daylight Harvesting
The SENSORWORX® wireless daylight harvesting photocell is a simple, yet reliable battery powered control solution. Preferred by contractors for their flexible mounting methods, SENSORWORX wireless photocells greatly reduce total installation time and wireless pairing fuss. Requiring just a few seconds per device, SENSORWORX wireless photocells can be linked to one or more wireless load controllers (such as the SWX-851 wireless wall switch, or a SWX-950 series wireless power pack). Additionally, these units provide an auto-setpoint selection mode that assists with choosing the controlled light level for a space.
SENSORWORX daylight harvesting sensors measure and transmit a space’s overall illumination to wirelessly connected load controllers. The load controllers then process these light level measurements and adjust light levels according to the configured setpoint and operational modes. For example, a connected dimming power pack load controller will gradually lower controlled lighting during times of high daylight contribution to a space. During times of no or low daylight contribution, controlled lighting will increase back up to its maximum level. A connected power pack or wall switch load controller can also be configured to switch lighting off completely in maintained high daylight conditions.
Auto-set-point calibration, where the unit determines its ambient light threshold (e.g., setpoint) based on the measured amount of light it is controlling, is initiated from the wireless photocell. The connected load controllers also provide the option of selecting from a range of preset values of ambient light thresholds (e.g., setpoints).
There are four types of photocell operation supported; DAYLIGHT HARVESTING CONTROL, DAYLIGHT HARVESTING w/ ON/OFF CONTROL, ON/OFF PHOTOCELL CONTROL, and INHIBIT PHOTOCELL CONTROL (see descriptions below). These operational modes are selected at the linked wireless power pack (SWX-950 Series) or wall switch controller (SWX-851) that is wired to the lighting load(s). A photocell sensor can be the only device wirelessly linked to a load controller or can be wirelessly linked along with wireless occupancy sensors to the same load controller(s).
DAYLIGHT HARVESTING CONTROL
- Recommend for spaces where it is important to not distract occupants (e.g., offices, classrooms).
- Lights will gradually dim in order to maximize energy savings while maintaining desired overall lighting level.
- After dimming to low trim level by default the lights will stay at the low trim level.
- Optionally, lighting can be configured to turn off completely when sufficient daylight is present.
- Requires that the wireless photocell is linked to a wireless power pack load controller with dimming (i.e. SWX-950-D2).
DAYLIGHT HARVESTING w/ ON/OFF CONTROL
- Same as Daylight Harvesting control except lights will turn off completely when sufficient daylight is present.
ON/OFF PHOTOCELL CONTROL
- Recommended for public spaces (hallways, entryways, etc) where fully switching of lighting off and on will not cause distraction of occupants.
- Lights are switched off if ambient light level surpasses threshold and back on if level drops.
- To prevent cycling of lights back on after lighting is turned off, a “deadband” level equal to the measured level of light being controlled is continously maintained. For lighting to turn off the ambient light level must be higher than the sum of the setpoint and the deadband.
INHIBIT ONLY PHOTOCELL CONTROL
- Upon initial occupancy, lighting is inhibited (i.e. held off) if ambient light level surpasses setpoint threshold.
- Lighting will be turned on if light level drops below set-point.
- Lighting will never turn off from daylight.
Features / Photocell & Daylight Harvesting
- Links in Seconds with Wireless Controllers
- Auto-Setpoint Selection Mode
- Daylight Harvesting and/or On/Off Photocell Control
- Multi-zone Configuration Ability
- 10 Year Battery Life Design
- Compact Size and Matte Finish
- Four Contractor Friendly Mounting Methods
- Mounting Nipple Attachment with Integrated Hole Saw
4.00” Diameter x 1.25” Height
(10.16 cm x 3.17 cm)
Wireless Linking (Pairing)
32°F to 122°F
(0°C to 50°C)
Indoor Use Only
Electrical & Wireless
Requires one CR123(A) Lithium Battery
Designed for 10 Year Life
(under default settings)
(saves all settings regardless of battery state)
Blink Warning @10% Life
80’ line of sight w/o obstruction (walls)
40’ with obstruction (walls/floors)
915 MHz ISM Band
Simple 3 sec. Push Button Process
All Wireless Data is Encrypted
On/Off Photocell Control
Modes Configured in Linked Controller
COMPATIBLE LOAD CONTROLLERS
SWX-851 Wall Switch
SWX-950 Series Power Packs
WIRELESS TEST MODE
Button Toggles On/Off Wirelessly Linked Loads
Auto-Setpoint Mode or
Selection from Linked Controller
These sensors can be used
to meet ASHRAE 90.1, IECC, &
Title 24 energy code requirements.
The sensor runs on one CR123(A) Lithium Battery (included).
Install battery prior to mounting photocell. Polarity is indicated on the battery compartment door.
If the photocell’s battery life reaches 10%, all wirelessly linked load controllers will blink lights on/off/on upon initial turn on as a replacement warning.
Replacement batteries are available at most retailers or home centers where batteries are sold or from SENSORWORX.
Wireless Linking (Pairing)
Linking a wireless photocell with a wireless load controller (e.g. SWX-950 series power pack or SWX-851 wall switch) is quickly done via the following procedure:
Step 1. Enter learn mode by holding down the wireless load controller button for 3 seconds until the LED starts alternating white then blue, then release.
Step 2. At the photocell, hold down the programming button for 3 seconds until the LED starts alternating white then blue. Releasing will link the photocell with any device in learn mode (see note 1 below) and. The lighting load being controlled will also be toggled off/on as a visual indication of success. Once linking is complete the photocell sensor will automatically run the auto-setpoint calibration procedure.
Step 3. Repeat step 2 to link another sensor or device.
Step 4. When all devices have been linked, exit learn mode on the wireless load controller by pressing the button 1 time. Learn mode will also be automatically closed after 15 minutes of no new devices being linked.
Note 1: When in learn mode, the alternating LED colors on the wireless load controller will periodically pause and blink out the total number of linked devices. There will be no blinks during the pause until the first device is linked..
EXAMPLE MODEL # SWX-250-B
|Wireless Ceiling Mount Daylight Harvesting Photocell, Battery Powered
|Accessory Trim Ring for Mounting to Single Gang Mudring, Handy Box, or 4” Octagon Box