Automatic temperature and humidity regulation – With timing element – Timer other than clock
Patent
1984-06-29
1985-10-15
Wayner, William E.
Automatic temperature and humidity regulation
With timing element
Timer other than clock
307 66, 337301, F23N 520
Patent
active
045469180
ABSTRACT:
A control device for controlling temperature conditioning apparatus is connected to a thermostatic switch means having a circuit requiring a small current to maintain the circuit active during the open cycle of the thermostat switch means. A positive temperature coefficient resistor is placed in parallel with the input circuit of the control device to provide a low input impedance to the control device for maintaining the small current without activating the control device. During the operation of the thermostat with the switch closed, a larger current to the positive temperature coefficient resistor causes the resistor to increase in temperature and thus its impedance so the wattage dissipated by the PTC resistor is reduced to minimize the heat dissipation and thus the temperature of the control.
REFERENCES:
patent: 3948441 (1976-04-01), Perkins et al.
patent: 4177923 (1979-12-01), Krump
patent: 4215815 (1980-08-01), Krump
patent: 4249696 (1981-02-01), Donnelly et al.
patent: 4340173 (1982-07-01), Kompelien
patent: 4365167 (1982-12-01), Weimer et al.
Blinn Clyde C.
Honeywell Inc.
Wayner William E.
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