Title: Time variable thermostat

Abstract: The invention is a time variable thermostatic device adapted for direct connection into a low voltage, two-wire, alternating current control circuit of a heating or cooling unit arranged to vary the temperature set point of a thermostat at selected times to control the operation of the heating or cooling unit. Circuit means including a transformer having primary and secondary windings interconnect in the two-wire control circuit a thermostat having a thermostatic switch, a starting relay or gas valve actuator and a timing means having a timing means that is a multiple of the frequency of the AC voltage in the control circuit together with mechanical means for changing the temperature set point at the desired time of day. The circuit permits actuation of the starting relay and operation of the heating or cooling unit only when the thermostatic switch is closed.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Knecht, William A. (Hartford, CT, US)
Zajac, Chester J. (Litchfield, CT, US)

Application Number: 694272
Filing Date: 1976-06-09
Publication_date: 1978-05-30
Assignee: Robertshaw Controls Company (Richmond, VA)
Primary Class(es): 236/46R 307/141.4
Other Classes:
US Patent Ref:

3599863	Aug, 1971	Pinckaers	236/46.
3620448	Nov, 1971	Nelson	236/46.
3940441	Apr, 1976	Perkins et al.	236/46.

Other Refs:
Primary Examiner: Wayner, William E.
Assistant Examiner:
Attorney: Adams; Harold W., Jackson, Jr.; Auzville