Furnace filter indicator

• US 8,029,608 B1
• Filed: 12/13/2006
• Issued: 10/04/2011
• Est. Priority Date: 12/13/2006
• Status: Expired due to Fees

• Current Assignee: BD Technology Partners
• Original Assignee: BD Technology Partners
• Inventors: Breslin, Stewart
• Primary Examiner(s): Greene; Jason M
• Assistant Examiner(s): SHUMATE, ANTHONY R
• Application Number:
  US11/638,993
• Time in Patent Office: 1,756 Days
• Field of Search: 95/19, 964/17, 964/21, 116/212, 340/611, 340/626
• US Class Current: 96/421
• CPC Class Codes: B01D 46/0086 Filter condition indicators
• CPC Class Codes: F24F 11/39 Monitoring filter performance
• CPC Class Codes: F24F 2110/40 Pressure, e.g. wind pressure

Abstract

A furnace filter indicator system comprises a pressure differential switch that monitors air pressure near a furnace filter, and a transmitter coupled to the pressure differential switch sends a signal to a receiver within a thermostat. The receiver includes an indicator for indicating the status of the furnace filter. If the pressure differential near the furnace filter triggers the switch, then the indicator will receive a “dirty” signal and will indicate that the furnace filter is dirty and should be replaced. The furnace filter indicator system is able to be installed on a previously installed furnace/thermostat system by utilizing the pre-existing wiring.

Claims

1. A system for indicating a status of a forced air furnace filter comprising:

a. a monitoring device for monitoring pressure differential;

b. a transmitter device coupled to the monitoring device for transmitting a signal related to the pressure differential;

c. a receiver device comprising one or more energy storing components, wherein the receiver device is coupled to the transmitter device for receiving the signal related to the pressure differential; and

d. an indicator coupled to the receiver device for indicating status of the air filter based on the signal;

wherein the transmitter device is housed separately from the receiver device, and wherein the receiver device is located at a thermostat.

2. The system as claimed in claim 1 wherein the transmitter device is coupled to a forced air furnace.

3. The system as claimed in claim 1 wherein the transmitter device is coupled to pre-existing wires coupling the furnace to the thermostat.

4. The system as claimed in claim 1 wherein the transmitter device and the receiver device are wirelessly coupled.

5. The system as claimed in claim 1 wherein the monitoring device is positioned to detect static air pressure near the filter and a room air pressure.

6. The system as claimed in claim 1 wherein the monitoring device is positioned to detect static air pressure on either side of the filter.

7. The system as claimed in claim 1 wherein the monitoring device is a differential pressure switch.

8. The system as claimed in claim 1 wherein the monitoring device is a differential pressure sensor.

9. The system as claimed in claim 1 wherein the indicator includes one or more light emitting diodes.

10. The system as claimed in claim 1 wherein the indicator is a liquid crystal display.

11. The system as claimed in claim 1 wherein the indicator indicates “

dirty”

after receiving a “

dirty”

signal from the transmitter device.

12. The system as claimed in claim 1 further comprising an audible indicator to audibly notify a user to change the filter.

13. The system as claimed in claim 3 wherein the transmitter device superimposes the signal on a carrier over the pre-existing wires.

14. The system as claimed in claim 13 wherein the carrier has a frequency of 175 KHz.

15. A system for indicating a status of a forced air furnace filter comprising:

a. a pressure differential switch positioned near the forced air furnace filter for monitoring pressure differential;

b. a transmitter device coupled to the pressure differential switch for transmitting a signal related to the pressure differential;

c. a receiver device comprising one or more energy storing components, wherein the receiver device is coupled to the transmitter device for receiving the signal related to the pressure differential; and

d. one or more light emitting diode indicators coupled to the receiver device for indicating status of the furnace filter based on the signal,

wherein the transmitter device is coupled to pre-existing wires coupling a furnace to a thermostat, and further wherein the transmitter device is housed separately from the receiver device and wherein the receiver device is located at the thermostat.

16. The system as claimed in claim 15 wherein the one or more light emitting diode indicators indicate “

dirty”

after receiving a “

dirty”

signal from the transmitter device.

17. The system as claimed in claim 15 further comprising an audible indicator to audibly notify a user to change the filter.

18. A method of indicating a status of a forced air furnace filter comprising:

a. detecting a pressure differential with a monitoring device;

b. sending a signal from a transmitter device to a receiver device comprising one or more energy storing components, wherein the signal corresponds to the pressure differential;

c. receiving the signal from the transmitter device at the receiver device; and

d. indicating status of the forced air furnace filter on an indicator corresponding to the signal from the receiver device;

wherein the transmitter device is housed separately from the receiver device, and wherein the receiver device is located at a thermostat.

19. The method as claimed in claim 18 further comprising installing the monitoring device and the transmitter device on a forced air furnace and installing the receiver device and the indicator on a thermostat.

20. The method as claimed in claim 19 wherein installing further comprises:

a. positioning the monitoring device; and

b. coupling the transmitter device to preexisting furnace wiring with the transmitter device coupled to the monitoring device, wherein the furnace is coupled to the thermostat.

21. The method as claimed in claim 18 wherein the transmitter device and the receiver device are wirelessly coupled.

22. The method as claimed in claim 20 wherein the monitoring device is positioned to detect static air pressure near the furnace filter and a room air pressure.

23. The method as claimed in claim 20 wherein the monitoring device is positioned to detect static air pressure on either side of the furnace filter.

24. The method as claimed in claim 18 wherein the monitoring device is a differential pressure switch.

25. The method as claimed in claim 18 wherein the monitoring device is a differential pressure sensor.

26. The method as claimed in claim 18 wherein the indicator includes one or more light emitting diodes.

27. The method as claimed in claim 18 wherein the indicator is a liquid crystal display.

28. The method as claimed in claim 18 wherein the indicator indicates “

dirty”

after receiving a “

dirty”

signal from the transmitter device.

29. The method as claimed in claim 18 wherein indicating the status is an audible signal.

30. The method as claimed in claim 20 wherein the transmitter device superimposes the signal on a carrier over the pre-existing wires.

31. The method as claimed in claim 30 wherein the carrier has a frequency of 175 KHz.

39. The method as claimed in claim 18 wherein the signal is sent from the transmitter device to the receiver device when a pressure differential indicates a dirty filter.

32. A method of installing a forced air furnace filter indicator comprising:

a. positioning a monitoring device near the forced air furnace filter; and

b. coupling a transmitter device to preexisting furnace wiring, wherein the transmitter device is also coupled to the monitoring device, and further wherein the forced air furnace is coupled to a housing containing a thermostat, a receiver and an indicator, wherein the receiver comprises one or more energy storing components;

wherein the transmitter device is housed separately from the thermostat.

33. The method as claimed in claim 32 wherein the monitoring device is a differential pressure switch.

34. The method as claimed in claim 32 wherein the monitoring device is a differential pressure sensor.

35. The method as claimed in claim 32 wherein the indicator includes one or more light emitting diodes.

36. The method as claimed in claim 32 wherein the indicator is a liquid crystal display.

37. The method as claimed in claim 32 wherein the indicator indicates “

dirty”

after receiving a “

dirty”

signal from the transmitter device.

38. A system for indicating a status of a forced air furnace filter comprising:

a. a monitoring device for monitoring pressure differential;

b. a transmitter having a transmitter housing, wherein the transmitter is coupled to the monitoring device for transmitting a signal related to the pressure differential;

c. a receiver having a receiver housing and one or more energy storing components, wherein the receiver is coupled to the transmitter for receiving the signal related to the pressure differential; and

d. an indicator coupled to the receiver for indicating status of the air filter based on the signal;

wherein the transmitter is housed separately from the receiver, and wherein the receiver is located at a thermostat.