The present disclosure presents techniques for improving operational efficiency of climate control systems. A climate control system may include climate control equipment, a sensor that measures temperature in a building, and a control system that controls operation of the equipment using a first temperature schedule, which associates each time step with a temperature setpoint, when the building is occupied. When not occupied, the control system determines an expected return time based on historical occupancy data associated with the building, determines the temperature setpoint associated with the expected return time, determines candidate schedules each expected to result in the inside air temperature meeting the temperature setpoint, determines efficiency metrics each associated with one of the candidates based on historical performance data resulting from previous operation of the climate control system, and controls operation of the equipment based on a second temperature schedule selected from the candidates based on associated efficiency metrics.

An electric control box assembly includes an outer box body, an inner box body provided in the outer box body and including an insulating member, an electric control board provided in the inner box body, and a component provided in the outer box body and located outside the inner box body. The component is connected with the inner box body.

An electric control box assembly includes an outer box body, an inner box body provided in the outer box body and including an insulating member, an electric control board provided in the inner box body, and a component provided in the outer box body and located outside the inner box body. The component is connected with the inner box body.

A motor control system providing at least seventeen speed settings using industry standard control signals and an industry standard five pin speed connector. One speed monitoring pin transmits an output signal for monitoring the speed of the motor, and four speed setting pins receive input signals for setting the speed. One of the speed setting pins receives and decodes two binary states and two frequency states, thereby providing a total of thirty-two speed settings. A non-regulated isolated winding is added to an internal transformer to provide an internal isolated flyback power supply for the motor, thereby liberating a pin on the industry standard five pin speed connector to provide the fourth speed setting input pin. Transmission circuitry is associated with the speed monitoring pin, and the non-regulated isolated winding is used to provide a direct current bias to the transmission circuitry.

A motor control system providing at least seventeen speed settings using industry standard control signals and an industry standard five pin speed connector. One speed monitoring pin transmits an output signal for monitoring the speed of the motor, and four speed setting pins receive input signals for setting the speed. One of the speed setting pins receives and decodes two binary states and two frequency states, thereby providing a total of thirty-two speed settings. A non-regulated isolated winding is added to an internal transformer to provide an internal isolated flyback power supply for the motor, thereby liberating a pin on the industry standard five pin speed connector to provide the fourth speed setting input pin. Transmission circuitry is associated with the speed monitoring pin, and the non-regulated isolated winding is used to provide a direct current bias to the transmission circuitry.

Provided are a control method and apparatus for increasing the amount of a circulating refrigerant, and an air conditioner. The control method includes: when a refrigerating capacity need is equivalent to a heating capacity need in the operation of an air-conditioning system, determining whether the discharge temperature of a compressor is greater than a preset safety alert value; if the discharge temperature of the compressor is greater than the safety alert value, adjusting the frequency of a fan of an outdoor heat exchanger; and when the discharge temperature of the compressor is not greater than the safety alert value, controlling to stop the adjustment of the frequency of the fan, and maintaining the air-conditioning system to operate at the adjusted current frequency of the fan.

Provided are a control method and apparatus for increasing the amount of a circulating refrigerant, and an air conditioner. The control method includes: when a refrigerating capacity need is equivalent to a heating capacity need in the operation of an air-conditioning system, determining whether the discharge temperature of a compressor is greater than a preset safety alert value; if the discharge temperature of the compressor is greater than the safety alert value, adjusting the frequency of a fan of an outdoor heat exchanger; and when the discharge temperature of the compressor is not greater than the safety alert value, controlling to stop the adjustment of the frequency of the fan, and maintaining the air-conditioning system to operate at the adjusted current frequency of the fan.

An air-conditioning apparatus includes a bypass pipe through which part of refrigerant discharged from a discharge port of a compressor flows. Heating components provided on a substrate of the controller include a first heating component and a second heating component that generates a smaller amount of heat than the first heating component. The first heating component is provided such that a longitudinal direction of the first heating component is parallel to a flow direction of the refrigerant in the bypass pipe, the longitudinal direction being a direction in which long sides of the first heating component extend. The second heating component is provided such that a widthwise direction of the second heating component is parallel to the flow direction of the refrigerant in the bypass pipe, the widthwise direction being a direction in which short sides of the second heating component extend.

An air-conditioning apparatus includes a bypass pipe through which part of refrigerant discharged from a discharge port of a compressor flows. Heating components provided on a substrate of the controller include a first heating component and a second heating component that generates a smaller amount of heat than the first heating component. The first heating component is provided such that a longitudinal direction of the first heating component is parallel to a flow direction of the refrigerant in the bypass pipe, the longitudinal direction being a direction in which long sides of the first heating component extend. The second heating component is provided such that a widthwise direction of the second heating component is parallel to the flow direction of the refrigerant in the bypass pipe, the widthwise direction being a direction in which short sides of the second heating component extend.

Provided are embodiments for a heating, ventilation, and air conditioning (HVAC) system for providing sensor information and sensor communication over relay-controlled power line. The system can include a controller of the HVAC system and a first power line converter coupled to the controller. The first power line converter is configured to receive data over a serial bus, convert the data into a communication message for transmission onto a power line, wherein the power line is configured to transmit power and communication messages, and transmit the communication message over the power line. Also provided are embodiments for transmitting and receiving a communication message over relay-controlled power line.