MULTI-STAGE CONTROL FOR ELECTROMECHANICAL HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) UNIT
First Claim
1. A control system for a heat transfer circuit, comprising:
- a thermostat having a first cooling level signal output terminal and a second cooling level signal output terminal;
a controller electrically connected to the thermostat;
a sensor electrically connected to the controller; and
a switch electrically connected to the controller, and that receives a first cooling level signal output from the thermostat, wherein the switch is in a first state when a sensor value from the sensor is less than a threshold, and a second state when the sensor value from the sensor is greater than or equal to the threshold, andwherein the first cooling level signal output enables a first cooling stage or a second cooling stage and a second cooling level signal output enables a third cooling stage.
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Accused Products
Abstract
A control system for a heat transfer circuit, an HVAC unit containing a heat transfer circuit, and a method of retrofitting an HVAC unit are described. The control system includes a thermostat having a first cooling stage signal output terminal and a second cooling stage signal output terminal; a controller electrically connected to the thermostat; a sensor electrically connected to the controller; and a switch electrically connected to the controller, and that receives a first cooling stage signal output from the thermostat. The switch is in a first state when a sensor value from the sensor is less than a threshold, and a second state when the sensor value from the sensor is greater than or equal to the threshold.
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Citations
18 Claims
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1. A control system for a heat transfer circuit, comprising:
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a thermostat having a first cooling level signal output terminal and a second cooling level signal output terminal; a controller electrically connected to the thermostat; a sensor electrically connected to the controller; and a switch electrically connected to the controller, and that receives a first cooling level signal output from the thermostat, wherein the switch is in a first state when a sensor value from the sensor is less than a threshold, and a second state when the sensor value from the sensor is greater than or equal to the threshold, and wherein the first cooling level signal output enables a first cooling stage or a second cooling stage and a second cooling level signal output enables a third cooling stage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A heat transfer circuit, comprising:
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a plurality of compressors, each of the plurality of compressors having different capacities; and a control system, comprising; a thermostat having a first cooling level signal output terminal and a second cooling level signal output terminal; a controller electrically connected to the thermostat; a sensor electrically connected to the controller; and a switch electrically connected to the controller, and that receives a first cooling level signal output from the thermostat, wherein the switch is in a first state when a sensor value from the sensor is less than a threshold, and a second state when the sensor value from the sensor is greater than or equal to the threshold, and wherein the first cooling level signal output enables a first cooling stage or a second cooling stage and a second cooling level signal output enables a third cooling stage. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method of retrofitting a heating, ventilation, and air conditioning (HVAC) unit, the HVAC unit including a thermostat and a plurality of compressors, the thermostat including a first cooling level output terminal and a second cooling level output terminal, the method comprising:
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connecting a switch in electrical communication with the thermostat and the plurality of compressors, such that the switch is electrically connected to the first cooling level output terminal; and connecting a sensor in electrical communication with the thermostat and the switch, wherein the sensor is configured to selectively modify a state of the switch based on a sensor value, such that the switch controls whether a first of the plurality of compressors is enabled or a second of the plurality of compressors is enabled; and connecting the plurality of compressors to the second cooling level output terminal such that all of the plurality of compressors are enabled when a second cooling level output signal is output from the second cooling level output terminal. - View Dependent Claims (17, 18)
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Specification