A heating and cooling system that includes a condenser coil configured to receive a refrigerant. A first compressor and a second compressor that pump the refrigerant through the condenser coil. A first condenser fan and a second condenser fan that push air over the condenser coil. A controller that receives a signal indicative of an ambient air temperature, a signal indicative of an operational status of the first compressor, and a signal indicative of an operational status of the second compressor. The controller controls operation of the first condenser fan and the second condenser fan in response to the signal indicative of the ambient air temperature, the signal indicative of the operational status of the first compressor and the signal indicative of the operational status of the second compressor.

A heating, ventilation, and/or air conditioning (HVAC) system, includes a housing configured to direct an air flow through an air flow path of the housing and an evaporator configured to translate between a first position and a second position, such that the evaporator is disposed within the air flow path in the first position and the evaporator is disposed external to the air flow path in the second position.

An HVAC system includes a controller communicatively coupled to a subcool sensor, an outdoor temperature sensor, a compressor, and a blower of the HVAC system. For a first period of time, the controller periodically determines subcool values. For each determined subcool value, a corresponding compressor speed, outdoor temperature, and blower speed are determined. A baseline database is generated with baseline values associated with normal operation of the HVAC system. Following the first period of time, subcool values are determined based on the subcool signal. For each subcool value, a corresponding compressor speed, outdoor temperature, and blower speed are determined. The controller determines whether each subcool value satisfies a criteria based on the baseline database. If the criteria are not satisfied for at least a threshold time, the system is determined to be operating under a fault condition, and a corresponding alert is transmitted.

An HVAC system includes an evaporator, a first sensor coupled to the evaporator at a first position, and a second sensor operably coupled to the evaporator at a second position. The first sensor monitors a first temperature of the refrigerant flowing in the evaporator at the first position, which is adjacent to the evaporator inlet. The second sensor monitors a second temperature of the refrigerant flowing in the evaporator at the second position, which is downstream from the first position. The system includes a controller, which receives a first signal corresponding to the first temperature and a second signal corresponding to the second temperature. The controller determines, based on the received signals, a temperature difference between the second temperature and the first temperature. In response to determining that the temperature difference is greater than a predefined threshold value, the controller determines that a loss of charge has occurred.

A modular valve system having fixed valve ports with frame openings on the exterior of each port. Corresponding connectors or plugs are designed to fit within the valve ports and be locked in place by a clip passing through the framed openings and around the connector or plug. The internal valve component may be electrically or mechanically controlled. The modular valve system may be connected to a vehicle coolant system to control fluid flow to a heat exchanger or bypassing the heat exchanger.

There is provided an air conditioning system that can reduce a power consumption while maintaining constant temperature controlling capability. To this end, a water air conditioning system includes a heat source unit to cool water, a utilization heat exchanger to exchange heat between air and the water cooled by the heat source unit, a secondary pump to cause the water to flow in the utilization heat exchanger, a water temperature sensor to detect a temperature of the water cooled by the heat source unit, and airflow volume changing means to increase an airflow volume of the air passing through the utilization heat exchanger when the temperature of the water cooled by the heat source unit becomes higher.

System and method for monitoring and detecting potential problems early in a VCC based HVAC&R system employs a monitoring application or agent that uses continuous machine learning and a temperature map to derive or “learn” a relation between a measured input power parameter of one or more system compressors, and condenser and evaporator intake fluid temperatures, based on observations of the temperatures and the input power parameter when the HVAC&R system is new or in a “newly maintained” condition. The monitoring agent can then use the learned relation to determine, based on subsequent observations of the condenser and evaporator intake fluid temperatures, the input power parameter values that should be expected if the HVAC&R system were operating in the “newly maintained” condition. The agent can thereafter compare the expected compressor input power parameter values with observed input power parameter values to determine early whether the system is experiencing performance degradation.

An HVAC system includes a suction-side sensor, a liquid-side sensor, an outdoor temperature sensor, and a controller. The controller determines that initial criteria are satisfied for initiating validation of the suction-side sensor and the liquid-side sensor. After determining that the initial criteria are satisfied, a suction-side property value, liquid-side property value, and outdoor temperature value are received. The controller determines whether a first validation criteria and a second validation criteria are satisfied. If both the first validation criteria and the second validation criteria are satisfied, the suction-side sensor, the liquid-side sensor, and the outdoor temperature sensor are determined to be functioning properly. Otherwise, the controller determines which one or more of the sensors are malfunctioning.

The indoor unit includes a plurality of outlet openings. In airflow rotation of the indoor unit, a full blowout mode and a partial blowout mode are executed. In the full blowout mode, all the outlet openings blow conditioned air. In the partial blowout mode, the flow of the blowing air of part of the outlet openings are blocked by the air current blocking mechanism, and thus the blowing wind speeds of the remaining outlet openings increases. As a result, an air temperature difference among parts of the indoor space decreases, and the comfort of the indoor space is improved.

A flow control device is configured to control fluid flow in an HVAC system. The flow control device includes a valve, an actuator configured to open and close the valve, and one or more sensors. The flow control device further includes a fault detection and correction agent configured to receive data from the one or more sensors, analyze the data according to a set of rules, and detect whether one or more faults have occurred. In response to detecting a fault, the fault detection and correction agent is configured to either operate the actuator to open or close the valve or initiate a corrective action to be taken by another device in the HVAC system.