Time variable thermostat

Details Time variable thermostat Time variable thermostat

1976-07-19

1978-03-14

Wayner, William E.

Automatic temperature and humidity regulation

With timing element

Timer other than clock

165 12, 361161, F23N 520, G05D 2300

Patent

active

040787206

ABSTRACT:
The invention is a time variable set point thermostatic device adapted for use in a two-wire circuit of a heating or cooling system without additional wiring. Electric timer means interconnected with a thermostatic switch and starting relay means of a transformer having a primary and secondary winding periodically changes the set point of the thermostatic switch at selected intervals. The circuit is arranged to limit the current in the two-wire control circuit to a value less than that required to actuate the starting relay of the heating or cooling system in the two-wire control circuit with the thermostatic switch open and to actuate the starting relay when the thermostatic switch is closed when the ambient temperature to be regulated varies a determined amount from a selected temperature set point and the thermostatic switch is closed.

REFERENCES:
patent: 3599863 (1971-08-01), Pinckaers
patent: 3620448 (1971-11-01), Nelson
patent: 3948441 (1976-04-01), Perkins et al.
U.S. Patent Application #694,272, Knecht et al., commonly assigned to Robertshaw Inc.

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