This solution permits easy installation in existing premises. If a solution is required for a new build, please see application 12B.
In small toilets, storerooms, copier rooms and other small rooms, it is often difficult to justify investment in presence-controlled lighting on economic grounds alone. Detection in premises of this type can be provided by an IR detector fitted with a 180° lens, placed where the light switch is normally located.
NOTE! This type of detector and placement should not be used in premises where people work at desks.

Often environmental benefits and increased convenience can also be included in the costing calculation and help justify the investment. Future rises in energy costs and the development of better and cheaper technology can also make it profitable to invest in presence-controlled lighting in smaller premises.

Light sources

This application shows an example with light fittings that have incandescent bulbs, 50 Hz coil ballasts or non-dimmable HF ballasts.

Detector placement

Several different types of detectors are available for installing in a mounting box in the place of a switch. Unfortunately there is some confusion over the limitations that apply to this type of detector and mounting location.

The 2300-PIR detector replaces a switch inside the doorway. This is not the optimum position for a passive IR detector. It is only suitable in certain applications, such as small archives, toilets or copier rooms, where people come and go and large movements are involved. Make sure that the detector is not obscured by furniture or fittings. (See diagram below.)

In this example a shelf has been positioned so that it obscures the detector’s sensing field!

Control system

The light fittings are connected directly to the detector. Observe the maximum permissible load (2,300 VA incandescent bulb, resistive load) for the detector. No more than two fluorescent light fittings should be connected directly to the detector. Use a contactor for larger loads. See the wiring diagram.

See also applications 9A and 12B for presence-controlled lighting in small premises.