Application Note #489
12 www.lutron.com
Ambient Light Detect (ALD) –
How it Works in Your Dual-Circuit Occupancy Sensing Switch
In the Dual-Circuit Occupancy Sensing Switch, Ambient Light Detect (ALD) is a setting that applies to the unit as a
whole, NOT to individual circuits. Any circuit that has been set to Auto-ON / Auto-OFF (Occupancy) mode will operate
under the ALD setting, if that setting is selected in “Advanced Auto-ON Modes.”
How does the sensor learn my preference?
The Dual-Circuit Occupancy Sensing Switch learns the same way as any single-circuit product with this feature.
It is important to note that the sensor will ONLY learn from interactions with circuits set to Auto-ON / Auto-OFF
(Occupancy) mode.
Will the sensor learn faster if I press both buttons when I enter?
No, the sensor will learn from any interaction with any Auto-ON/ Auto-OFF (Occupancy) circuit within the first
5 seconds of entering a room.
I believe I’m using ALD correctly in my Dual-Circuit product, but I’m still not getting the response I expect.
What could be happening?
- Please make sure that the button(s) you press when you enter the room correspond to a circuit set to “Auto-ON /
Auto-OFF (Occupancy) mode.” The sensor will NOT learn from interactions with any circuit in “Manual-ON / Auto-OFF
(Vacancy) mode.”
- If you have set your fan load to “Auto-ON / Auto-OFF (Occupancy) mode,” your fan may be responding based on
daylight in the room. Unless this is desired, it’s likely that many of the interactions with this fan load are NOT based
on the light level of the room, and the unit’s learned threshold is being affected by these interactions.
NOTE:
Lutron advises all customers using ALD to keep fan loads on Manual-ON / Auto-OFF (Vacancy) mode, to make sure
the learned threshold is not affected by unintentional interactions with the fan load.
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