The K15 is a sensor with its own microprocessor, in addition to its infrared sensor and photo sensors, with the ability for delayed auto off, it also has the capability for vacancy mode and occupancy mode; it can also be used in conjunction with classic wall switches through its dry contact input. The output of the K15 is can be connected to an ac power source so that it can be used to directly control the lights, or it can be used connected to the dry contact DI of another device. The vacancy and occupancy modes of operation are introduced below.

K15 Occupancy Mode

The occupancy mode is most often used in places that are high traffic areas, such as restrooms, hallways, pantries, storerooms and so on. The basic operation is people come, lights turn on; people leave, lights turn off. But manual operation can also be used to turn the lights on or off in advance.

The Purpose of the Manual Switch

1. Turn the lights off manually before the auto delay off kicks in.
2. Augment the blind spot of the sensor, enabling the lights to still be turned on manually when needed.
3. For the purpose of saving energy, the photo sensitivity is set to its lowest level, at this time, even though it has detected the occupant, it still won’t turn the lights on. However, when there is a special event, a long button press can activate the prolonged on mode which allows the light to remain on indefinitely up until it is turned off manually (at this time, the sensors are ignored).
4. The push button switches are low voltage switches, and thus there is little danger of current leakage.

K15 Vacancy Mode

The vacancy mode is most often used in places of work, such as small offices, labs, lounges, meeting rooms, workshops and so on. In the past, these places would have classic rocker switches, but the problem with these is that when the occupant leaves, they often forget to turn the lights off which leads to wasted energy. The K15 in conjunction with push button switches can effectively reduce wasted energy.

1. The lights need to be turned on manually.
2. The lights can be turned off manually, but if the occupant leaves and forgets to turn the lights off, the sensor will detect that the occupant has left and will turn the lights off automatically.
3. There are times when the lights need to be turned off even there are occupants, such as when the projector screen is being used, in which case the lights can forcibly be turned off.

The Purpose of the Manual Switch

1. For use within the room to manually turn the lights on and off, the sensor is used only as a backup to turn off the lights in case the user forgets after they leave.
2. As much as possible, when leaving the room, the lights should still be turned off manually, and one shouldn’t depend on the sensor to activate the delayed auto off.
3. Since the push button is low voltage, then there is little danger of electric shock from leakage currents.
4. Even when the power is supplied, the lights will still not turn on, it will only turn on when the button is pressed. This behavior is different from regular wall switches.