ApplicationNo. 489414 filed on 07/17/1974
US Classes:236/9A, Combined heating and apartment control with heating medium circulation control165/260, Variable rate of heating or cooling (e.g., plural stages, etc.)236/68B, Auxiliary heater applied to main temperature sensing means337/377, With auxiliary heating means62/202Including external thermal source modifying sensor action
ExaminersPrimary: Wayner, William E.
Attorney, Agent or Firm
International ClassG05D 23/30 (20060101)
AbstractThe disclosure describes an improved thermostat for a heating or cooling system which is capable of accurately controlling the duration of the cycle periods of the system. The improved thermostat includes an anticipator capable of dissipating heat at a substantially constant rate over a wide range of applied voltages and current. According to a preferred teaching of the disclosure, the anticipator comprises a thermistor consisting of positive temperature coefficient (PTC) material.