Alternative feedback usage for hvac system

Abstract

A control system for a heating, ventilation, and/or air conditioning (HVAC) system includes a controller. The controller is configured to control the HVAC system to condition an air flow based on first feedback from a first sensor of the HVAC system, receive second feedback from a second sensor of the HVAC system, and control the HVAC system to condition the air flow based on the second feedback instead of the first feedback when the first feedback from the first sensor being no longer available. The first feedback is indicative of a first operating parameter of the HVAC system, and the second feedback is indicative of a second operating parameter of a refrigerant flowing through the HVAC system.

1 - 20 . (canceled) 
     
     
         21 . A control system for a heating, ventilation, and/or air conditioning (HVAC) system, comprising:
 a controller configured to:
 operate the HVAC system to condition an air flow based on first feedback from a first sensor of the HVAC system, wherein the first feedback is indicative of a first value of a first operating parameter of the HVAC system; and 
 in response to a determination that the first feedback from the first sensor is unavailable:
 receive second feedback from a second sensor of the HVAC system, wherein the second feedback is indicative of a second value of a second operating parameter of the HVAC system; 
 apply an adjustment to the second value of the second operating parameter; and 
 operate the HVAC system to condition the air flow based on the second value instead of the first value. 
 
   
     
     
         22 . The control system of  claim 21 , wherein the controller is configured to apply the adjustment to the second value of the second operating parameter to approximate the first value of the first operating parameter. 
     
     
         23 . The control system of  claim 22 , wherein the adjustment comprises an adjustment value, and the controller is configured to add the adjustment value to the second value of the second operating parameter or subtract the adjustment value from the second value of the second operating parameter to approximate the first value of the first operating parameter. 
     
     
         24 . The control system of  claim 23 , wherein the adjustment value is based on an equipment specification of the HVAC system, testing data of the HVAC system, a geographic location of the HVAC system, or any combination thereof. 
     
     
         25 . The control system of  claim 21 , wherein the first operating parameter is a liquid temperature of a refrigerant in an outdoor coil of the HVAC system, and the second operating parameter is a temperature of the outdoor coil. 
     
     
         26 . The control system of  claim 21 , wherein the first operating parameter is a temperature of an outdoor coil of the HVAC system, and the second operating parameter is an outdoor ambient temperature of an ambient environment of the HVAC system. 
     
     
         27 . The control system of  claim 21 , wherein the first operating parameter is a first temperature of a refrigerant on a suction side of a compressor of the HVAC system, and the second operating parameter is a second temperature of the refrigerant exiting an indoor coil of the HVAC system. 
     
     
         28 . The control system of  claim 21 , wherein the first operating parameter is a first parameter of a refrigerant discharged by a compressor of the HVAC system, and the second operating parameter is a second parameter of the refrigerant discharged by the compressor of the HVAC system, the first parameter is different from the first parameter, and the controller is configured to:
 in response to the determination that the first feedback from the first sensor is unavailable:
 receive third feedback from a third sensor of the HVAC system, wherein the third feedback is indicative of a temperature value of a temperature of an ambient environment of the HVAC system; and 
 operate the HVAC system to condition the air flow based on the second value instead of the first value and based on the temperature value. 
   
     
     
         29 . The control system of  claim 21 , wherein the first operating parameter is a pressure of a refrigerant of the HVAC system, and the controller is configured to:
 in response to the determination that the first feedback from the first sensor is unavailable:
 receive third feedback from a third sensor of the HVAC system, wherein the third feedback is indicative of a temperature value of a temperature of an ambient environment of the HVAC system; and 
 operate the HVAC system to condition the air flow based on the second value instead of the first value and based on the temperature value. 
   
     
     
         30 . The control system of  claim 21 , wherein the controller is configured to limit operation of a compressor of the HVAC system to a reduced capacity in response to the determination that the first feedback from the first sensor is unavailable and during operation of the HVAC system to condition the air flow based on the second value instead of the first value. 
     
     
         31 . A controller for a heating, ventilation, and/or air conditioning (HVAC) system, wherein controller comprises a non-transitory computer-readable medium having computer-executable instructions that, when executed by a processor, are configured to cause the processor to:
 receive feedback from a plurality of sensors of the HVAC system;   operate the HVAC system to condition an air flow based on first feedback from a first sensor of the plurality of sensors, wherein the first feedback corresponds to a first value of a first operating parameter of the HVAC system; and   in response to a determination that the first feedback from the first sensor is unavailable:
 select second feedback received from a second sensor of the plurality of sensors based on an identification of the first operating parameter, wherein the second feedback corresponds to a second value of a second operating parameter of the HVAC system; 
 apply an adjustment value to the second value of the second operating parameter to determine an approximated value of the first operating parameter; and 
 operate the HVAC system to condition the air flow based on the approximated value. 
   
     
     
         32 . The controller of  claim 31 , wherein the first operating parameter is a first temperature, and the second operating parameter is a second temperature. 
     
     
         33 . The controller of  claim 32 , wherein the first temperature is a suction temperature of refrigerant received by a compressor of the HVAC system, and the second temperature is an evaporation temperature of refrigerant discharged from an indoor coil of the HVAC system. 
     
     
         34 . The controller of  claim 31 , wherein the first operating parameter is a first pressure, and the second operating parameter is a second pressure. 
     
     
         35 . The controller of  claim 34 , wherein the instructions, when executed by the processor, are configured to cause the processor to:
 in response to the determination that the first feedback from the first sensor is unavailable:
 receive third feedback from a third sensor of the plurality of sensors, wherein the third feedback corresponds to a temperature of an ambient environment of the HVAC system; and 
 determine the adjusted value of the first operating parameter based on the temperature of the ambient environment. 
   
     
     
         36 . The controller of  claim 31 , wherein the instructions, when executed by the processor, are configured to cause the processor to:
 add the adjustment value to the second value of the second operating parameter to determine the approximated value of the first operating parameter; or   subtract the adjustment value from the second value of the second operating parameter to determine the approximated value of the first operating parameter.   
     
     
         37 . A control system for a heating, ventilation, and/or air conditioning (HVAC) system, comprising:
 a plurality of sensors; and   a controller communicatively coupled to the plurality of sensors, wherein the controller is configured to:
 operate the HVAC system to condition an air flow based on first feedback from a first sensor of the plurality of sensors, wherein the first feedback is indicative of a first operating parameter of the HVAC system; 
 receive second feedback from a second sensor of the HVAC system, wherein the second feedback comprises a second operating parameter of the HVAC system; 
 receive third feedback from a third sensor of the HVAC system, wherein the third feedback comprises a temperature of an ambient environment of the HVAC system; and 
 in response to a determination that the first feedback is unavailable, operate the HVAC system to condition the air flow based on the second feedback, the third feedback, or both. 
   
     
     
         38 . The control system of  claim 37 , wherein the second feedback comprises a value of the second operating parameter, and the controller is configured to:
 adjust the value of the second operating parameter based on the temperature of the ambient environment to determine an adjusted value of the second operating parameter; and   operate the HVAC system to condition the air flow based on the adjusted value.   
     
     
         39 . The control system of  claim 37 , wherein the second feedback comprises a value of the second operating parameter, and the controller is configured to add an adjustment value to the value of the second operating parameter to determine an adjusted value or subtract the adjustment value from the value of the second operating parameter to determine the adjusted value, wherein the adjustment value is based on an equipment specification of the HVAC system, testing data of the HVAC system, a geographic location of the HVAC system, the temperature of the ambient environment, or any combination thereof. 
     
     
         40 . The control system of  claim 37 , wherein the controller is configured to limit operation of a compressor of the HVAC system to a reduced capacity in response to the determination that the first feedback from the first sensor is unavailable and during operation of the HVAC system to condition the air flow based on the second feedback, the third feedback, or both.