US8613792B2
Active / In Force
US
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Method and systems for setting an air filter change threshold value in an HVAC system
Assignee: Resideo LLC
•
Filing: 2011-06-20
•
Granted: 2013-12-24
•
Expires: 2031-06-20
Abstract
Abstract A clean air filter may be used to set an air filter change threshold value for an air filter monitor installed in an HVAC system. The air filter change threshold value may be used to determine a status of an air filter (e.g., clean or dirty).
Inventors
- 👤 Amy Ragland
- 👤 Barbara Dean-Hendricks
- 👤 Christopher Goh
- 👤 Reed Bisson
- 👤 Steven Hoglund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:47
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/42; B01D46/10
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
114 words
A method of setting an air filter change threshold value for an HVAC system, the HVAC system having a number of controllable HVAC components including a fan, wherein the fan, when activated, drives air through the air filter of the HVAC system, the method comprising: turning the fan of the HVAC system “on” to drive air through the air filter; with the fan “on”, obtaining a measure related to an amount of flow restriction presented by the air filter; determining an air filter change threshold value based, at least in part, on the measure related to the amount of flow restriction presented by the air filter; and storing the air filter change threshold value.
Claim 2
Independent Claim
114 words
A method of setting an air filter change threshold value for an HVAC system, the HVAC system having a number of controllable HVAC components including a fan, wherein the fan, when activated, drives air through the air filter of the HVAC system, the method comprising: turning the fan of the HVAC system “on” to drive air through the air filter; with the fan “on”, obtaining a measure related to an amount of flow restriction presented by the air filter; determining an air filter change threshold value based, at least in part, on the measure related to the amount of flow restriction presented by the air filter; and storing the air filter change threshold value.
Claim 3
Dependent Claim
25 words
The method of claim 1 further comprising displaying the measure related to the amount of flow restriction presented by the air filter on a display.
Claim 4
Dependent Claim
17 words
The method of claim 1 further comprising displaying the air filter change threshold value on a display.
Claim 5
Dependent Claim
18 words
The method of claim 3 further comprising allowing a user to adjust the air filter change threshold value.
Claim 6
Dependent Claim
25 words
The method of claim 4 , further comprising displaying an adjustment bar on the display for increasing or decreasing the air filter change threshold value.
Claim 7
Dependent Claim
15 words
The method of claim 1 , wherein the air filter is a clean air filter.
Claim 8
Dependent Claim
58 words
The method of claim 1 , further comprising: obtaining a measure related to an amount of flow restriction presented by a dirty air filter; notifying a user to change the dirty air filter when the measure related to an amount of flow restriction presented by the dirty air filter is greater than the air filter change threshold value.
Claim 9
Dependent Claim
42 words
The method of claim 1 , wherein the measure related to the amount of flow restriction presented by the air filter corresponds to a differential pressure between a location upstream of the air filter to a location downstream of the air filter.
Claim 10
Dependent Claim
28 words
The method of claim 1 , wherein the HVAC system is in a heating mode when the fan is turned “on” to drive air through the air filter.
Claim 11
Dependent Claim
28 words
The method of claim 1 , wherein the HVAC system is in a cooling mode when the fan is turned “on” to drive air through the air filter.
Claim 12
Dependent Claim
28 words
The method of claim 1 , wherein the HVAC system is in a ventilation mode when the fan is turned “on” to drive air through the air filter.
Claim 13
Dependent Claim
15 words
The method of claim 1 , wherein the display is part of an HVAC controller.
Claim 14
Dependent Claim
15 words
The method of claim 12 , wherein the HVAC controller is a wall mounted thermostat.
Claim 15
Independent Claim
152 words
A method of setting an air filter change threshold value for an HVAC system, the HVAC system having a number of controllable HVAC components including a fan, wherein the fan, when activated, drives air through the air filter of the HVAC system, the method comprising: instructing an HVAC system to operate in a selected mode in response to an indication that a clean air filter has been installed; obtaining a measure of a differential pressure across the clean air filter while the HVAC system is operating in the selected mode to obtain a differential pressure value associated with the clean air filter; determining an air filter change threshold value that is indicative of an expected pressure differential value across a dirty filter, the air filter change threshold value based, at least in part, on the differential pressure value associated with the clean air filter; and storing the air filter change threshold value.
Claim 16
Independent Claim
152 words
A method of setting an air filter change threshold value for an HVAC system, the HVAC system having a number of controllable HVAC components including a fan, wherein the fan, when activated, drives air through the air filter of the HVAC system, the method comprising: instructing an HVAC system to operate in a selected mode in response to an indication that a clean air filter has been installed; obtaining a measure of a differential pressure across the clean air filter while the HVAC system is operating in the selected mode to obtain a differential pressure value associated with the clean air filter; determining an air filter change threshold value that is indicative of an expected pressure differential value across a dirty filter, the air filter change threshold value based, at least in part, on the differential pressure value associated with the clean air filter; and storing the air filter change threshold value.
Claim 17
Dependent Claim
21 words
The method of claim 14 further comprising displaying the differential pressure value associated with the clean air filter on a display.
Claim 18
Dependent Claim
17 words
The method of claim 14 further comprising displaying the air filter change threshold value on a display.
Claim 19
Dependent Claim
18 words
The method of claim 14 further comprising allowing a user to adjust the air filter change threshold value.
Claim 20
Dependent Claim
25 words
The method of claim 17 , further comprising displaying an adjustment bar on the display for increasing or decreasing the air filter change threshold value.
Claim 21
Dependent Claim
134 words
An HVAC controller comprising: a controller; a memory coupled to the controller; a display coupled to the controller; wherein the controller is programmed to: instruct an HVAC system to operate in a selected mode in response to an indication that a clean air filter has been installed; obtain a measure of a differential pressure across the clean air filter while the HVAC system is operating in the selected mode to obtain a differential pressure value associated with the clean air filter; determining an air filter change threshold value that is indicative of an expected pressure differential value across a dirty filter, the air filter change threshold value based, at least in part, on the differential pressure value associated with the clean air filter; and storing the air filter change threshold value in the memory.
Claim 22
Dependent Claim
134 words
An HVAC controller comprising: a controller; a memory coupled to the controller; a display coupled to the controller; wherein the controller is programmed to: instruct an HVAC system to operate in a selected mode in response to an indication that a clean air filter has been installed; obtain a measure of a differential pressure across the clean air filter while the HVAC system is operating in the selected mode to obtain a differential pressure value associated with the clean air filter; determining an air filter change threshold value that is indicative of an expected pressure differential value across a dirty filter, the air filter change threshold value based, at least in part, on the differential pressure value associated with the clean air filter; and storing the air filter change threshold value in the memory.
Claim 23
Dependent Claim
30 words
The HVAC controller of claim 19 further comprising displaying the air filter change threshold value on the display, and allowing a user to adjust the air filter change threshold value.
References Cited (Backward Citations)
US3071914A
Cited
US3928006A
Cited
US5036698A
Cited
US5131932A
Cited
US5429649A
Cited
US5351035A
Cited
US5679137A
Cited
US5711785A
Cited
US5668535A
Cited
US5862737A
Cited
US6013121A
Cited
US5840094A
Cited
US5810908A
Cited
US5917141A
Cited
US6190442B1
Cited
US6321637B1
Cited
US6507282B1
Cited
EP1143232A1
Cited
US6596059B1
Cited
US20020082746A1
Cited
US6448896B1
Cited
US20030070544A1
Cited
US7435278B2
Cited
US7225054B2
Cited
US6993414B2
Cited
US7261762B2
Cited
US20060032379A1
Cited
US8034170B2
Cited
US7244294B2
Cited
US20070013534A1
Cited
US7419532B2
Cited
US7452396B2
Cited
US7594960B2
Cited
US7713339B2
Cited
US8029608B1
Cited
US20100084482A1
Cited
US20090140062A1
Cited
US20090143880A1
Cited
US20090143916A1
Cited
US20090143918A1
Cited
US20090140056A1
Cited
US20090143879A1
Cited
US20090165644A1
Cited
US20110061527A1
Cited
US20110185895A1
Cited
US20120125592A1
Cited
US20120323375A1
Cited
US20120323374A1
Cited
US20120319851A1
Cited
US20120318073A1
Cited
US20120323377A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2016-12-23 | 2017-06-24 | 2017-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2020-12-23 | 2021-06-24 | 2021-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2024-12-23 | 2025-06-24 | 2025-12-24 | $7700.00 | Window Closed / Lapsed |