Applications

There are two types of photocell operation; ON/OFF PHOTOCELL CONTROL and DAYLIGHT HARVESTING CONTROL (see descriptions below). A photocell sensor can be used by itself (e.g., STANDALONE operation) or together with low voltage occupancy sensors. Only one photocell sensor should be configured to control any particular group of lights.

On/Off Photocell Control

• Recommended for public spaces (hallways, entryways, etc) where fully switching lighting off/on will not be noticed.
• Photocell output (blue wire) will turn lights 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 continuously maintained in the unit. For lighting to turn off the ambient light level must be higher than the sum of the setpoint and the deadband.

Daylight Harvesting Control

• Recommended for spaces where it is important to not distract occupants (e.g., offices, classrooms).
• Unit will gradually dim lighting in order to maximize energy savings while maintaining desired overall lighting level.
• After dimming to low trim level, unit can optionally be enabled to turn off lights completely.