Efficient fan controller
US9995493B2 · kind B2 · utility
Inventors
Key dates
| Filing date | May 2, 2016 |
| Grant date | Jun 12, 2018 |
| Priority date | — |
| Expiry date | Dec 10, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F11/46
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An efficient fan controller for Heating Ventilating Air Conditioning (HVAC) systems including at least one electrical signal input from thermostat or equipment control terminals with a microprocessor to control a switching device connected to a signal output to control a fan relay and operate a system fan. The microprocessor is configured to monitor a thermostat call for cooling/heating duration and determine a variable fan-off delay based on the cooling cycle or heating cycle duration, and at an end of a cooling/heating cycle energize the fan relay to operate the system fan for the variable fan-off delay. The fan controller can include a heat pump detection signal input and electrical signal inputs to connect to a thermostat heat terminal, heat pump reversing valve terminal, or compressor terminal. The fan controller can also include a normally-closed relay connected to the switching device to maintain continuity between the fan signal input and output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.