HVAC controller with HVAC system fault detection
First Claim
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1. An HVAC controller configured to control one or more components of an HVAC system, the HVAC controller comprising:
- a user interface including a display;
a memory;
a controller connected to the memory and the user interface, the controller programmed to monitor a delta T that is representative of a difference in temperature between a return air side and a discharge air side of an HVAC system during operation of the HVAC system, and to determine a performance level of the HVAC system based, a least in part, on one or more delta T limits stored in the memory of the HVAC controller; and
wherein the controller is configured to record a delta T fault in the memory of the HVAC controller if the monitored delta T falls outside of one or more of the delta T limits for at least a predetermined amount of time during a current HVAC cycle, the controller further configured to determine whether to display on the display of the HVAC controller a user alert based at least in part on a count of the delta T faults recorded within a predetermined period of time or during a predetermined number of HVAC cycles.
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Abstract
An HVAC controller may be programmed to monitor a current delta T of an HVAC system and to determine a performance level of the HVAC system based, at least in part, on one or more delta T limits stored in the memory of the HVAC controller. The HVAC controller may be further programmed to display or provide a user alert if the performance level falls outside of a normal operating range for the HVAC system.
365 Citations
18 Claims
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1. An HVAC controller configured to control one or more components of an HVAC system, the HVAC controller comprising:
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a user interface including a display; a memory; a controller connected to the memory and the user interface, the controller programmed to monitor a delta T that is representative of a difference in temperature between a return air side and a discharge air side of an HVAC system during operation of the HVAC system, and to determine a performance level of the HVAC system based, a least in part, on one or more delta T limits stored in the memory of the HVAC controller; and wherein the controller is configured to record a delta T fault in the memory of the HVAC controller if the monitored delta T falls outside of one or more of the delta T limits for at least a predetermined amount of time during a current HVAC cycle, the controller further configured to determine whether to display on the display of the HVAC controller a user alert based at least in part on a count of the delta T faults recorded within a predetermined period of time or during a predetermined number of HVAC cycles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of monitoring a performance of an HVAC system, the HVAC system including one or more HVAC components that are controlled, at least in part, by an HVAC controller having a memory, a controller, and a user interface with a display, the HVAC system operating in a number of HVAC cycles, the method comprising:
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the controller monitoring one or more signals from the HVAC system to determine a current delta T value for the HVAC system, wherein the current delta T value is representative of a difference in temperature between a return air side and a discharge air side of the HVAC system during operation of the HVAC system; the controller determining a performance level of the HVAC system based, a least in part, on the current delta T value and a delta T limit stored in the memory of the HVAC controller; wherein the controller is configured to record a delta T fault in the memory of the HVAC controller if the current delta T falls outside of the delta T limit for at least a predetermined amount of time during a current HVAC cycle; and wherein the controller is configured to determine whether to display on the display of the HVAC controller a user alert based at least in part on a count of the delta T faults recorded within a predetermined period of time or during a predetermined number of HVAC cycles. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An HVAC controller configured to control one or more components of an HVAC system, the HVAC controller comprising:
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a user interface including a display; a memory; and a controller connected to the memory and the user interface, the controller programmed to monitor a current delta T that is representative of a difference in temperature between a return air side and a discharge air side of an HVAC system, and to determine a performance level of the HVAC system based, a least in part, on one or more delta T limits stored in the memory of the HVAC controller; wherein the controller is configured to record a delta T fault in the memory of the HVAC controller if the monitored delta T falls outside of the one or more delta T limits for at least a predetermined amount of time during a current HVAC cycle, the controller further programmed to display on the display of the HVAC controller a user alert, wherein the controller determines whether to display the user alert based at least in part on a count of the delta T faults recorded within a predetermined period of time or during a predetermined number of HVAC cycles.
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Specification