A power converting apparatus outputs an alternating-current power to drive an electric motor, and includes: a switching circuit that converts an input direct-current power to an alternating-current power based on driving of MOS-FETs and outputs the alternating-current power; and a driving control unit capable of controlling a carrier frequency and controlling the driving of the MOS-FETs. The driving control unit controls the carrier frequency on the basis of a noise level of a carrier noise obtained by combining noises that occur in the electric motor and the power converting apparatus due to the driving of the MOS-FETs at the carrier frequency and a noise level of driving noises from a plurality of noise sources that occur irrespective of the carrier frequency in the same housing in which the power converting apparatus and the electric motor are contained.

A power converting apparatus outputs an alternating-current power to drive an electric motor, and includes: a switching circuit that converts an input direct-current power to an alternating-current power based on driving of MOS-FETs and outputs the alternating-current power; and a driving control unit capable of controlling a carrier frequency and controlling the driving of the MOS-FETs. The driving control unit controls the carrier frequency on the basis of a noise level of a carrier noise obtained by combining noises that occur in the electric motor and the power converting apparatus due to the driving of the MOS-FETs at the carrier frequency and a noise level of driving noises from a plurality of noise sources that occur irrespective of the carrier frequency in the same housing in which the power converting apparatus and the electric motor are contained.

A combination water heating, air conditioning refrigerant system is described. The combined system includes a plurality of independently adjustable electronic expansion valves. The expansion valves can independently modulate the delivery of high-temperature, high-pressure refrigerant to either a water heat exchanger or an outside condenser. A controller can receive input signals, including temperature signals from one or more temperature sensors that indicate the temperature at various locations of the system. The temperature signals include one or more of water temperature signals, ambient air temperature signals, or refrigerant super heat temperatures signals. In response to the input signals, the controller can output control signals to one or more of the plurality of electronic expansion valves.

A combination water heating, air conditioning refrigerant system is described. The combined system includes a plurality of independently adjustable electronic expansion valves. The expansion valves can independently modulate the delivery of high-temperature, high-pressure refrigerant to either a water heat exchanger or an outside condenser. A controller can receive input signals, including temperature signals from one or more temperature sensors that indicate the temperature at various locations of the system. The temperature signals include one or more of water temperature signals, ambient air temperature signals, or refrigerant super heat temperatures signals. In response to the input signals, the controller can output control signals to one or more of the plurality of electronic expansion valves.

A heating, ventilation, and air conditioning (HVAC) system includes a variable refrigerant flow (VRF) unit including a variable speed compressor, a VRF heat exchanger, and a reversing valve of a vapor compression circuit. In addition, the HVAC system includes an air handling unit (AHU) including an AHU heat exchanger of the vapor compression circuit. Furthermore, the HVAC system includes a housing, wherein the VRF unit and the AHU are disposed within the housing, and wherein the variable speed compressor is configured to circulate a refrigerant through the VRF heat exchanger and the AHU heat exchanger, and the reversing valve is configured to adjust a flow direction of the refrigerant through the vapor compression circuit to adjust operation of the HVAC system between a cooling operation mode and a heating operation mode.

A heating, ventilation, and air conditioning (HVAC) system includes a variable refrigerant flow (VRF) unit including a variable speed compressor, a VRF heat exchanger, and a reversing valve of a vapor compression circuit. In addition, the HVAC system includes an air handling unit (AHU) including an AHU heat exchanger of the vapor compression circuit. Furthermore, the HVAC system includes a housing, wherein the VRF unit and the AHU are disposed within the housing, and wherein the variable speed compressor is configured to circulate a refrigerant through the VRF heat exchanger and the AHU heat exchanger, and the reversing valve is configured to adjust a flow direction of the refrigerant through the vapor compression circuit to adjust operation of the HVAC system between a cooling operation mode and a heating operation mode.

A refrigerant pipe connected to a flow divider includes a first pipe made of aluminum or aluminum alloy, and a second pipe made of copper or copper alloy. A first connection end of the first pipe and a second connection end of the second pipe are connected. A cover member is disposed in a through hole to extend across an internal space and an external space of a casing, A first portion of the refrigerant pipe including the first connection end of the first pipe and the second connection end of the second pipe is covered with the cover member.

A refrigerant pipe connected to a flow divider includes a first pipe made of aluminum or aluminum alloy, and a second pipe made of copper or copper alloy. A first connection end of the first pipe and a second connection end of the second pipe are connected. A cover member is disposed in a through hole to extend across an internal space and an external space of a casing, A first portion of the refrigerant pipe including the first connection end of the first pipe and the second connection end of the second pipe is covered with the cover member.

A window-type air conditioner that is installable in a window frame is provided. The window-type air conditioner includes an outdoor module including a compressor for compressing a refrigerant, an outdoor heat exchanger in which heat exchange between outdoor air and the refrigerant occurs, and an outdoor housing accommodating the compressor and the outdoor heat exchanger, an indoor module including an indoor housing spaced apart from the outdoor housing, and an indoor heat exchanger that is arranged in the indoor housing and in which heat exchange between indoor air and the refrigerant occurs, a refrigerant pipe providing a flow path through which the refrigerant moves between the indoor module and the outdoor module, and a connection support module connecting the indoor module and the outdoor module, and being configured so that opposite end portions thereof support the indoor housing and the outdoor housing, wherein at least one soundproof member surrounding the refrigerant pipe is arranged in the connection support module.

A window-type air conditioner that is installable in a window frame is provided. The window-type air conditioner includes an outdoor module including a compressor for compressing a refrigerant, an outdoor heat exchanger in which heat exchange between outdoor air and the refrigerant occurs, and an outdoor housing accommodating the compressor and the outdoor heat exchanger, an indoor module including an indoor housing spaced apart from the outdoor housing, and an indoor heat exchanger that is arranged in the indoor housing and in which heat exchange between indoor air and the refrigerant occurs, a refrigerant pipe providing a flow path through which the refrigerant moves between the indoor module and the outdoor module, and a connection support module connecting the indoor module and the outdoor module, and being configured so that opposite end portions thereof support the indoor housing and the outdoor housing, wherein at least one soundproof member surrounding the refrigerant pipe is arranged in the connection support module.