Fan controller
US9500386B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Aug 30, 2016 |
| Grant date | Nov 22, 2016 |
| Priority date | — |
| Expiry date | Aug 30, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F11/46
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
Apparatus and methods are disclosed for a fan controller. The fan controller determines HVAC system type and heating or cooling mode for gas furnace, heat pump, electric resistance, and hydronic heating, ventilating, and air conditioning (HVAC) systems. For gas furnace heating systems, the apparatus and methods include energizing the blower fan from a lower fan speed used for heating by the furnace-fan controller to the high-speed used for cooling by the fan controller after fan-on delay time P1 to increase delivered heating capacity, satisfy the thermostat sooner and save heating energy. For heat pump, electric resistance, and hydronic heating systems the apparatus and methods include energizing the fan relay after a short fan-on delay time P0 based on previous off-cycle duration P11. For all these HVAC systems, the apparatus and methods vary extended fan-off time delay P2 as a function of cool-source operational time P4 or heat-source operational time P3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.