Control systems and methods for preventing evaporator coil freeze
AssigneeLennox Industries Inc.
InventorsRakesh GOEL, Siddarth Rajan
Life of this patent
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Abstract
In an embodiment, a method of preventing evaporator coil freeze in a heating, ventilation and air conditioning (HVAC) system is performed by a controller in the HVAC system. The method includes determining a reference saturated suction temperate (SST) via a sensor disposed in relation to an evaporator coil in the HVAC system. The method also includes determining whether the reference SST is below a minimum SST threshold. The method also includes, responsive to a determination that the reference SST is below the minimum SST threshold, increasing a discharge air temperature (DAT) setpoint.
Claims20
A method of preventing evaporator coil freeze in a heating, ventilation and air conditioning (HVAC) system, the method comprising, by a controller in the HVAC system:
- determining a reference saturated suction temperate (SST) via a sensor disposed in relation to an evaporator coil in the HVAC system;
- determining whether the reference SST is below a minimum SST threshold;
- and
- responsive to a determination that the reference SST is below the minimum SST threshold, increasing a discharge air temperature (DAT) setpoint.
A heating, ventilation, and air conditioning (HVAC) system comprising:
- an evaporator coil;
- a sensor disposed in relation to the evaporator coil;
- a compressor fluidly coupled to a condenser coil and the evaporator coil;
- and
- a controller operatively coupled to the compressor, wherein the controller is operable to perform a method comprising:
- determining a reference saturated suction temperate (SST) via the sensor;
- determining whether the reference SST is below a minimum SST threshold;
- and
- responsive to a determination that the reference SST is below the minimum SST threshold, increasing a discharge air temperature (DAT) setpoint.
A computer-program product comprising a non-transitory computer-usable medium having computer-readable program code embodied therein, the computer-readable program code adapted to be executed to implement a method comprising:
- determining a reference saturated suction temperate (SST) via a sensor disposed in relation to an evaporator coil in an HVAC system;
- determining whether the reference SST is below a minimum SST threshold;
- and
- responsive to a determination that the reference SST is below the minimum SST threshold, increasing a discharge air temperature (DAT) setpoint.
Dependencies are inferred from the claim text.