Failure mode for HVAC system
First Claim
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1. A method of computer control of an HVAC system comprising the steps of:
- (1) inferring whether a stage of an HVAC component is a failed stage by;
(a) monitoring a temperature of a controlled area;
(b) monitoring a slope of the relationship between the temperature of the controlled area and the time period.(c) inferring whether the stage has failed from a relationship between the temperature of the controlled area and a time period; and
(2) removing the failed stage detected in said step (1) from a staging sequence.
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Abstract
A HVAC system provides a central control which detects failed stage(s); removes the failed stage(s) from the staging sequence used by the controller; and later checks the failed stage periodically to see if the failed stage has become functional so that the no properly operational stage is returned to a staging sequence. The central control detects the failed stages and/or components by direct communication with the failed stages and/or components and/or by monitoring a temperature of a controlled area to determine if any particular stage is operating properly.
84 Citations
13 Claims
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1. A method of computer control of an HVAC system comprising the steps of:
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(1) inferring whether a stage of an HVAC component is a failed stage by; (a) monitoring a temperature of a controlled area; (b) monitoring a slope of the relationship between the temperature of the controlled area and the time period. (c) inferring whether the stage has failed from a relationship between the temperature of the controlled area and a time period; and (2) removing the failed stage detected in said step (1) from a staging sequence.
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2. A method of computer control of an HVAC system comprising the steps of:
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(1) inferring whether a stage of an HVAC component is a failed stage; (a) monitoring a temperature of a controlled area; (b) monitoring a rate of change of a relationship between the temperature of the controlled area and the time period. (c) inferring whether the stage has failed from a relationship between the temperature of the controlled area and a time period; and (2) removing the failed stage detected in said step (1) from a staging sequence.
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3. A method of computer control of an HVAC system comprising the steps of:
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(1) monitoring a rate of change of a relationship between a temperature of a controlled area and a time period for a first stage of an HVAC component; (2) determining whether the first stage is a failed stage in response to said step (1); and (3) removing the failed stage determined in said step (2) from a staging sequence. - View Dependent Claims (4)
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5. A method of computer control of an HVAC system comprising the steps of:
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(1) monitoring a rate of change of a relationship between a temperature of a controlled area and a time period for a first stage of an HVAC component and comparing the rate of change to a stored rate of change for the first stage; (2) determining whether the first stage is a failed stage in response to said step (1); and (3) removing the failed stage determined in said step (2) from a staging sequence. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method of computer control of an HVAC system comprising the steps of:
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(1) monitoring a first rate of change of a first relationship between a temperature of a controlled area and a first time period for a first stage of an HVAC component; (2) monitoring a second rate of change of a second relationship between the temperature of the controlled area and a second time period for a second stage of the HVAC component; (3) determining whether the second stage is a failed stage in response to said steps (1) and (2); and (4) removing the failed stage determined in said step (3) from a staging sequence. - View Dependent Claims (12, 13)
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Specification