Abstract: In one instance a support unit for supporting a portion of a heating, ventilation, and air conditioning system is provided that includes a base rail frame that on two sides has at least a first pocket and second pocket for receiving the ends of a compressor beam. The compressor beam has angled faces on both ends that interface with angled faces in the pockets. In this way, when assembled and loaded, the compressor beam will fit in the pockets and remain in place. Others systems and methods are presented.

Abstract: A heating, ventilation, air conditioning (HVAC) system includes a multi-path expansion device subsystem positioned between a condenser and an evaporator. The multi-path expansion device subsystem includes a flow selector operative to receive a refrigerant from the condenser and selectively deliver the same to a full-load pathway or to a partial-load pathway. The full-load pathway has a modulating valve and a fixed orifice sized for a full-load situation, and the partial-load pathway has a thermal expansion valve (TXV) sized for partial load operation. A controller uses an actuator of the flow selector to choose which pathway is authorized according to certain process logic.

Abstract: A compressor system includes a variable-speed compressor and a fixed-speed compressor. A control unit is operatively coupled to the variable-speed compressor and is operatively coupled to the fixed-speed compressor. A sensor is operatively coupled to the control unit and disposed in an enclosed space. The sensor measures at least one of a temperature and a relative humidity of the enclosed space and determines an HVAC load of the enclosed space. Responsive to a determination of the HVAC load, the control unit directs operation of the variable-speed compressor and the fixed-speed compressor.

Abstract: One aspect, as provided herein, is directed to a multi-stage fluid control system for a fluid source heat pump system. This embodiment comprises compressors configured to operate as separate, heat exchange stages, condensers each being fluidly coupled to at least one of the compressors by refrigerant tubing and having intake ends coupled together by a fluid intake manifold. This embodiment further includes output conduits coupled to each of the condensers and that are couplable to a distal location. Further included is a modulating valve control system interposed the output conduits. The modulating valve control system is configured to stage a flow of fluid through the condensers based on a number of operating compressors.

Abstract: In various implementations, a request for operation of an air conditioner may be received. The air conditioner may include a cooling mode and/or a dehumidifying mode. In some implementations, a compressor speed for a compressor of the air conditioner may be determined, and which mode(s) of the air conditioner to allow may be determined based at least partially on the determined compressor speed.

Abstract: An HVAC system includes an evaporator. A compressor is fluidly coupled to the evaporator via a suction line. A condenser is fluidly coupled to the compressor via a discharge line. The condenser includes a first pass and a second pass. A common manifold fluidly couples the first pass and the second pass. A charge compensator is fluidly coupled to the common manifold above a maximum liquid level of the common manifold.

Abstract: A heating, ventilation, and air conditioning (HVAC) system for regulating humidity of an enclosed space. The HVAC system includes an evaporator coil. A metering device is fluidly coupled to the evaporator coil. A variable-speed compressor is fluidly coupled to the condenser coil and the evaporator coil and a controller is operatively coupled to the variable-speed compressor. A humidity sensor is operatively coupled to the controller and exposed to the enclosed space. Responsive to a determination that the relative humidity of the enclosed space exceeds the maximum humidity threshold, the controller adjusts a speed of the variable-speed compressor to increase latent capacity of the HVAC system. Responsive to a determination that the relative humidity of the enclosed space falls below the minimum humidity threshold, the controller adjusts a speed of the variable-speed compressor to decrease latent capacity of the HVAC system.

Abstract: Systems and methods for fabricating an air purification device for use typically with heating, ventilating, and air conditioning (HVAC) system are presented. The systems include at least one pleated insert disposed within a cartridge housing and proximate a source of electromagnetic radiation. The pleated insert includes a plurality of pleat strips aligned substantially parallel to a common pleat axis. Each pleat strip has a first edge and a second edge. Portions or surfaces proximate the first edge and the second edge of each pleat strip are bonded so as to form an alternating sequence of peaks and valleys. A photocatalytic material coats at least a portion of the pleated insert. Methods for fabricating the pleated insert from a slice member having an unexpanded honeycomb structure are also presented. Other systems and methods are presented.

Abstract: A heating, ventilation and air conditioning (HVAC) controller, a method of detecting multiplexed input signals and an HVAC system employing the controller or the method. In one embodiment, the HVAC controller includes: (1) a signal conditioner configured to convert received alternating current (AC) input signals into corresponding square wave signals of a digital logic voltage, (2) a multiplexer coupled to the signal conditioner and configured to select one of the square wave signals and (3) a sample analyzer coupled to the multiplexer and configured to evaluate multiple samples of the selected one of the square wave signals to derive a binary state.

Abstract: An air conditioner includes a heat exchanger having one or more flow paths. At least one of the flow paths is associated with more than one pass and/or fluid flow through the flow path is restricted. A setting of the beat exchanger includes associations between flow path(s) and/or pass(es). A setting for the heat exchanger is determined and the heat exchanger is allowed to operate in the determined setting.

Abstract: A metering device is fluidly coupled to the condenser coil. A distributor is fluidly coupled to the metering device. An evaporator coil is fluidly coupled to the distributor via a plurality of evaporator circuit lines. A re-heat coil is disposed adjacent to the evaporator coil. The re-heat coil includes a first fluid connection to the metering device via a re-heat return line and a second re-heat feed line. The re-heat coil includes a second fluid connection to the condenser coil via a connecting line and a condenser intake line. A first check valve is disposed between the connecting line and the condenser intake line. A second check valve is disposed between the re-heat return line and the second re-heat feed line.

Abstract: An evaporator coil system includes a segmented evaporator coil. The segmented evaporator coil includes a primary segment and a secondary segment. A first plurality of evaporator circuit lines are fluidly coupled to the primary segment and a second plurality of evaporator circuit lines are fluidly coupled to the secondary segment. A suction line includes a first connection fluidly coupled to the primary segment and a second connection fluidly coupled to the secondary segment. A valve is arranged in fluid communication with the secondary segment so as to selectively restrict refrigerant flow through the secondary segment.

Abstract: A method of determining loss of refrigerant charge in a heating, ventilation, and air conditioning (HVAC) system. The method includes receiving, using a controller, a plurality of temperature values from a plurality of temperature sensors placed at multiple locations within the HVAC system and calculating, using the controller using the plurality of temperature values, a plurality of temperature-dependent values. The method further includes determining, using the controller, whether a first temperature-dependent value of the plurality of temperature-dependent values is above a first predetermined temperature value and responsive to a determination that the first temperature-dependent value is above the first predetermined temperature value, transmitting, using the controller to a user interface, a notification indicating that the HVAC system is operating with low refrigerant charge.

Abstract: A system incudes an equipment interface module (EIM) and a control unit. The EIM includes a signal encoder that is operable to generate one or more encoded signals by encoding one or more instructions onto one or more electrical signals according to one or more received commands from a thermostat unit. The signal encoder is further operable to transmit the generated one or more encoded signals on one or more of a plurality of electrical wires. The control unit is coupled to the EIM via the plurality of electrical wires and includes a signal decoder. The signal decoder is operable to decode the one or more instructions from the one or more encoded signals on the one or more electrical wires. The control unit is operable to control one or more functions of a motor according to the decoded instructions from the signal decoder.

Abstract: A system includes one or more systems, a controller and a server. The one or more systems including one or more heating, ventilation, and air conditioning (HVAC) systems, refrigeration systems, or building automation systems. The controller is communicatively coupled to the one or more systems. The server is communicatively coupled to the controller. The controller receives telemetry data associated with the operation of the one or more systems. The received telemetry data includes data associated with individual components of the one or more systems. The controller also determines a subset of the telemetry data that has changed by comparing the received telemetry data to previous telemetry data. The controller also communicates to the server only the subset of the telemetry data that has changed.

Abstract: A method of controlling operations of an HVAC system includes measuring temperature within an enclosed space, receiving a setpoint temperature within the enclosed space, calculating a temperature difference between the measured temperature and the received setpoint temperature, and determining whether the temperature difference between the measured temperature and the received setpoint temperature is greater than or equal to a first predetermined temperature differential value. If the temperature difference between the measured temperature and the received setpoint temperature is greater than or equal to the first predetermined temperature differential value, determining whether the temperature difference between the measured temperature and the received setpoint temperature is greater than or equal to a second predetermined temperature differential value.

Abstract: A condenser system that includes a first compressor and a second compressor. An upper coil and a de-superheater coil are fluidly coupled to the first compressor. The upper coil, the de-superheater coil, and the first compressor define a first compressor circuit. A lower coil is fluidly coupled to the second compressor. The lower coil and the second compressor define a second compressor circuit. The upper coil and the de-superheater coil together utilize an entire heat-transfer surface area.

Abstract: The HVAC system includes an evaporator coil and a metering device fluidly coupled to the evaporator coil via a distribution line. The HVAC system includes a variable-speed circulation fan for circulating air around the evaporator coil. A temperature sensor is thermally exposed to the distribution line. At least one controller is operatively coupled to the temperature sensor and to the variable-speed circulation fan. The at least one controller adjusts a speed of the variable-speed circulation fan to increase latent capacity of the HVAC system responsive to a determination that a temperature of fluid in the distribution line exceeds an optimal distribution line temperature.

Abstract: A system for reducing refrigerant pressure in an HVAC system includes a receptacle that is fluidly coupled to a condenser. The receptacle is coupled to the condenser between a first pass and a second pass of refrigerant across a flow path of air. The receptacle can include a connection allowing for refrigerant flow into the receptacle during periods of high pressure. High pressure situations can therefore be alleviated, saving wear and tear on the HVAC system.

Abstract: In various implementations, an air conditioner may include one or more compressors, more than one expansion device, and/or a microchannel condenser. High pressure events may occur during operation of the air conditioner and may be identified. When a high pressure event is identified a bypass operation may be allowed.