PX9700 and PX9900 activated by PIR occupancy detector. When activated, room temperature is boosted from background to comfort temperature for a pre-set period of time. Comfort temperature, background temperature and time delay selected on installation. • User cannot adjust settings once installed. PX01001 touchpad activated. PX9900 offers additional level of setback (fixed at 5°C if room is still unoccupied after eight hours). Heating cannot be reactivated until current comfort period expires