Refrigeration unit air temperature detection alarm system
Electronic temperature control system
Central system for controlling remote devices over power lines
Multiple station temperature monitor system
Data communication system for activating remote loads
Thermostat alterable by remote control
Method and apparatus for power load shedding
Control unit for a multi-unit building
ApplicationNo. 064387 filed on 05/21/1993
US Classes:236/49.3, Electrically actuated236/51, DISTANCE-ADJUSTED340/3.1, Monitoring in addition to control (e.g., supervisory)340/825.69Radio link
ExaminersPrimary: Wayner, William E.
Attorney, Agent or Firm
Foreign Patent References
International ClassF24F 007/00
AbstractA hierarchical control system including a central receiver; a first communications medium operably connecting the central receiver to at least one controller; and a controller operably connected to the central receiver by the first communications medium. The system also includes a sensor for sensing conditions; a second communication medium; and a transmitter for transmitting the sensed conditions from the sensor to the central receiver via the second communications medium. The central receiver also includes receiver for receiving transmissions on the second communications medium and a transmitter for retransmitting the transmissions on the first communications medium.