Patent application number | Description | Published |
20140131599 | Expansion Valve Control System and Method for Air Conditioning Apparatus - A method of controlling an HVAC system electronic expansion valve (EEV) includes determining an optimal EEV position for the HVAC system as a function of a variable related to an ambient environment enthalpy and operating the HVAC system as a function of the optimal EEV position. | 05-15-2014 |
20140260343 | VARIABLE FREQUENCY DRIVE APPARATUSES, SYSTEMS, AND METHODS AND CONTROLS FOR SAME - Detection of reverse rotation or operation of a refrigerant compressor is provided. In one aspect, a detection technique includes starting the compressor and determining the compressor is rotating in a reverse direction if a dome temperature of the compressor fails to exceed a first predetermined threshold at or before expiration of a first predetermined period of time following starting, the refrigerant pressure at a refrigerant inlet of the compressor remains constant for a second predetermined period of time following starting, and/or the frequency of pressure oscillations of the refrigerant at the refrigerant inlet exceeds a second predetermined threshold. Another technique for determining the compressor is rotating in the reverse direction involves analyzing a waveform associated with motor current, motor torque, or refrigerant pressure. Further embodiments, forms, features, and aspects shall become apparent from the description and drawings. | 09-18-2014 |
20140371917 | System and Method for Monitoring HVAC System Operation - A comfort controller in an HVAC system is provided. The comfort controller comprises a processor configured such that the comfort controller compares at least one of an actual run time of the HVAC system to a benchmark run time and an actual static pressure of the HVAC system to a benchmark static pressure. The processor is further configured such that, when at least one of the actual run time and the actual static pressure are outside a specified range of their associated benchmarks, the comfort controller determines that the HVAC system has an improper configuration. The processor is further configured such that the comfort controller displays the results of the comparison. | 12-18-2014 |
20150068226 | APPARATUS AND METHOD FOR CONTROLLING INDOOR AIRFLOW FOR HEAT PUMPS - An apparatus and method for controlling the heating of an airflow. According to certain embodiments, the temperature of an outdoor heat exchanger and the speed of a compressor are used to determine a blower speed for a variable speed indoor air blower. The selected blower speed may facilitate a flow of air across a second, indoor heat exchanger at an indoor volumetric flow rate that heats the airflow to a leaving air temperature. The leaving air temperature may at least seek to attain the temperature of a variable target leaving air temperature that is adjusted based on changes in outdoor ambient temperatures. Additionally, according to certain embodiments, the blower speed may be based on an indoor volumetric airflow rate that is determined, at least in part, on a determined system heating capacity and a temperature at the outdoor heat exchanger. | 03-12-2015 |
20150068231 | HVAC System with Electronically Controlled Expansion Valve - A two temperature electronic expansion valve control for variable speed compressors that utilizes a correlation between airflow percentage and heat exchanger pressure drop to control the operation of an expansion valve. An indoor airflow percentage request may be communicated from an outdoor controller to an air handler controller. Using a correlation between airflow percentage and pressure drop across the heat exchanger, the airflow percentage may be used in predicting an outlet pressure of refrigerant exhausted from the heat exchanger. The predicted pressure drop may be used in determining a saturated temperature for the exhausted refrigerant. The determined saturated temperature may be compared to a sensed temperature of the refrigerant at the outlet of the heat exchanger to determine a superheat value, which is compared to a reference superheat value in determining the degree to open or close the expansion valve. | 03-12-2015 |
20150070047 | DIAGNOSTICS FOR SYSTEMS INCLUDING VARIABLE FREQUENCY MOTOR DRIVES - One embodiment is a diagnostic method for a system including setting a first diagnostic code based upon a condition of a DC bus of a variable frequency drive during a first drive state, setting at least one additional diagnostic code based upon a condition of at least one motor phase current during a second drive state, outputting first diagnostic information indicating a malfunction of the variable frequency drive if the first diagnostic code indicates a first error, and outputting second diagnostic information indicating a malfunction of a motor or a connector coupling the motor and the drive if the at least one additional diagnostic code indicates a second error. | 03-12-2015 |
20150345813 | System and Method for Sensor Location Verification - Systems and methods are disclosed herein that include controlling operation of a heating, ventilation, and/or air conditioning (HVAC) system that utilizes information from a plurality of temperature sensors to monitor, verify, determine, and/or discover whether a temperature sensor is properly located in proximity to a dome of a compressor of the HVAC system. When the HVAC system determines that the temperature sensor associated with the dome of the compressor is not properly located, the HVAC system may initiate a shutdown of the compressor and/or other components of the HVAC system, generate a signal, present a message, and/or otherwise provide a notification of the improper temperature sensor placement, and/or reduce a runtime of the compressor, operate the compressor at a lower speed, reduce a power consumption of the compressor, and/or otherwise control the compressor and/or associated components to effectuate a reduced compressor dome temperature. | 12-03-2015 |
20160123646 | Expansion Valve Control System and Method for Air Conditioning Apparatus - Systems and methods of controlling an HVAC system electronic expansion valve (EEV) include determining an optimal EEV position for the HVAC system as a function of a variable related to an ambient environment enthalpy and operating the HVAC system as a function of the optimal EEV position. | 05-05-2016 |