The next system, control D, to be discussed was characterized by the use of a four-point room thermostat which ... Figure 26 shows a block diagram for the thermostat with the relative positions of the contacts marked (1), (2), (3), and (4). ... the two contacts in the fan circuit. ... 26, the fan would start, and the travel of the thermostat blade would reverse, the blade then moving in the room heating direction.
|Title||:||Bulletin - Engineering Experiment Station. Illinois. University|