Method and systems for setting an air filter change threshold value in an HVAC system
First Claim
Patent Images
1. 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.
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Accused Products
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).
121 Citations
20 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. 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:
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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. - View Dependent Claims (15, 16, 17, 18)
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19. An HVAC controller comprising:
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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. - View Dependent Claims (20)
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Specification