Joseph E. Childs - Golden CO, US Roger W. Rognli - Otsego MN, US Robert J. Cox - Maple Grove MN, US Brock Simonson - Carrington ND, US
International Classification:
F25B 49/02 F25B 1/00
US Classification:
62115, 62126
Abstract:
An extended run time device for extending the time that a compressor-based heating, ventilating, and air-conditioning (HVAC) system runs so as to increase energy efficiency of the HVAC system. The extended run time device includes a sensing circuit, a switching device and a processor. Based upon a signal from the sensing circuit, the processor causes the switching device to transmit a proxy control signal to the compressor, thereby causing power to the compressor to be maintained for a time period longer than a time period requested by the temperature control device.
James A. Coffel - Shakopee MN, US Roger W. Rognli - Otsego MN, US Kevin C. Allmaras - Carrington ND, US Brock M. Simonson - Carrington ND, US
International Classification:
F25D 17/06 F25D 17/04
US Classification:
62 89, 62186
Abstract:
A fan-control device for overriding normal operation of a circulation fan delivering conditioned air through ductwork in an unconditioned space. The fan-control device includes a detection circuit and a fan relay. The detection circuit is configured to detect a cooling system control voltage and a cooling system control current and to output a fan control override signal when the cooling system control voltage is detected and the cooling system control current is absent.
Efficiency Heating, Ventilating, And Air Conditioning Through Indirect Extension Of Compressor Run Times
- Dublin, IE Roger W. Rognli - Otsego MN, US Brock M. Simonson - Carrington ND, US
International Classification:
F25B 49/02 F24F 11/30 F24F 11/62 F04B 49/06
Abstract:
A load control device for improving energy efficiency of a heating, ventilating, and air-conditioning (HVAC) system by controlling shed times of a compressor of the HVAC system. The load control device includes a compressor cutoff switch, a sensing circuit, and a processor. The processor determines a subsequent mandatory shed time based upon a previous shed time, a previous run time, and a minimum run time. A subsequent mandatory shed longer than the previous mandatory shed time causes a subsequent run time to be increased, thereby increasing system efficiency.