Abstract: An air-conditioning apparatus includes at least one indoor unit with intake and blow-out ports, a refrigerant gas sensor disposed in an air flow path inside the indoor unit; and a control device. The indoor unit has an indoor fan drawing indoor air in from the intake port and blowing conditioned air out from the blow-out port, an indoor temperature sensor detecting temperature of the indoor air, an indoor-side refrigerant circuit circulating a refrigerant having a greater specific gravity when gasified than air and producing conditioned air from the indoor air, and at least one refrigerant temperature sensor detecting refrigerant temperature in the refrigerant circuit. The control device drives the indoor fan in accordance with at least one of an operation mode and a detection value of the at least one refrigerant temperature sensor, and detects refrigerant leakage using the refrigerant gas sensor.

Abstract: A heat source unit includes a compressor and an electrical component box both disposed inside a casing, where a bottom frame forming a bottom surface of the casing includes a first bottom frame on which the compressor is disposed and a second bottom frame that is adjacent to the first bottom frame. At least half of the electrical component box is placed above the second bottom frame.

Abstract: A heat source unit includes: a corrugated plate-like bottom frame in which ridges and furrows extend across the front and rear direction or across the right and left direction; and mounting feet. The mounting feet include: supports that support, from below, the furrows of supported ends of the bottom frame on sides that the ridges and the furrows can be seen; and walls disposed on outer sides of the supported ends and that extend upward from the supports. Water drainage passages, that drain water sticking to tops of the ridges of the supported ends to the supports, are disposed above the supports.

Abstract: An outdoor unit of an air conditioning device includes an outdoor unit main body having a square planar shape, a heat exchanger provided along a side surface of this outdoor unit main body, and a fan provided in an upper part of the outdoor unit main body, the fan for blowing out air in the outdoor unit main body upward. An opening portion capable of providing communication between an interior and an exterior of the outdoor unit main body is formed between a one side end portion and an other side end portion of the heat exchanger adjacent to each other, and in at least one of the side end portions positioned in a peripheral edge of the opening portion, a cover member for covering a heat transfer tube protruding from the side end portion is provided.

Abstract: A heat source unit constitutes part of a basic refrigerant circuit including: a compressor that compresses refrigerant; an accumulator that temporarily accumulates the refrigerant before the refrigerant is sucked into the compressor; an oil separator that separates refrigerating machine oil from the refrigerant after the refrigerant has been discharged from the compressor; a heat source-side heat exchanger that functions as a radiator or an evaporator of the refrigerant; a liquid refrigerant communication pipe; utilization-side expansion valves; utilization-side heat exchangers; and a gas refrigerant communication pipe that are connected to one another, the heat source unit comprising refrigerant circuit constituent parts including the compressor, the accumulator, the oil separator, and the heat source-side heat exchanger that are provided inside a casing, and the refrigerant circuit constituent parts being changed or added in accordance with capacity or function.

Abstract: An outdoor unit for a refrigeration cycle apparatus includes: a fan; a bellmouth that covers a periphery of the fan; a casing that internally houses the fan and the bellmouth so that airflow faces upward and that has a top end edge having a flat shape; and a diffuser surface disposed below a top end edge of the casing but above a top end of the bellmouth and on the outer side relative to the top end of the bellmouth in plan view, wherein the diffuser surface is inclined to extend outward away from the rotation axis of the fan as getting upward. The casing has a plurality of side surfaces that cover the sides of the bellmouth. At least one of the side surfaces has a recessed shape toward the bellmouth so that a gap with the top end edge of the bellmouth is reduced.

Abstract: An air conditioner includes a liquid pressure adjusting expansion valve that is located in an outdoor liquid refrigerant pipe at a part thereof closer to a liquid refrigerant communication pipe than to a refrigerant cooler and configured to reduce a pressure of a refrigerant so that a refrigerant flows through the liquid refrigerant communication pipe in a gas-liquid two-phase state and so that the refrigerant flows through an outlet of a refrigerant cooler in a liquid state.

Abstract: An air-conditioning apparatus includes at least one indoor unit with intake and blow-out ports, a refrigerant gas sensor disposed in an air flow path inside the indoor unit; and a control device. The indoor unit has an indoor fan drawing indoor air in from the intake port and blowing conditioned air out from the blow-out port, an indoor temperature sensor detecting temperature of the indoor air, an indoor-side refrigerant circuit circulating a refrigerant having a greater specific gravity when gasified than air and producing conditioned air from the indoor air, and at least one refrigerant temperature sensor detecting refrigerant temperature in the refrigerant circuit. The control device drives the indoor fan in accordance with at least one of an operation mode and a detection value of the at least one refrigerant temperature sensor, and detects refrigerant leakage using the refrigerant gas sensor.

Abstract: An indoor fan, an indoor heat exchanger, and refrigerant piping are housed in a casing having an air inlet and air outlets. An air conditioning indoor unit includes a first temperature sensor that measures a temperature of air in an air conditioning target space, a second temperature sensor that measures a temperature of the refrigerant piping, and a determining component that determines if there is refrigerant leakage while operation is stopped. The determining component performs a refrigerant leakage determination that is a determination whether there is refrigerant leakage based on a difference between the temperatures detected by the first temperature sensor and the second temperature sensor.

Abstract: A refrigeration apparatus includes a primary circuit with a first expansion valve, a bypass circuit extending between branching and joining portions on the refrigerant primary circuit, a heat exchanger, a second expansion valve disposed upstream of the heat exchanger in the bypass circuit, first and second refrigerant flow rate calculating components, and a determining component. The primary circuit also includes a compressor, radiator, and evaporator. The heat exchanger includes first and second refrigerant flow paths disposed on the primary and bypass circuits, respectively, to cause heat between refrigerant flowing in the paths. The first and second refrigerant flow rate calculating components calculate first and second flow rates of refrigerant flowing through the bypass circuit based on refrigeration cycle theory and fluid theory, respectively.

Abstract: As a shut-off valve inspection process for checking operation of a liquid side shut-off valve and a gas side shut-off valve, an air conditioning system operates a compressor in a cooling cycle state, performs opening and closing operation of the liquid side shut-off valve and the gas side shut-off valve, and determines whether the liquid side shut-off valve and the gas side shut-off valve properly operate on the basis of a temperature value detected by a temperature sensor provided in an indoor unit.

Abstract: A refrigeration apparatus includes a primary circuit with a first expansion valve, a bypass circuit extending between branching and joining portions on the refrigerant primary circuit, a heat exchanger, a second expansion valve disposed upstream of the heat exchanger in the bypass circuit, first and second refrigerant flow rate calculating components, and a determining component. The primary circuit also includes a compressor, radiator, and evaporator. The heat exchanger includes first and second refrigerant flow paths disposed on the primary and bypass circuits, respectively, to cause heat between refrigerant flowing in the paths. The first and second refrigerant flow rate calculating components calculate first and second flow rates of refrigerant flowing through the bypass circuit based on refrigeration cycle theory and fluid theory, respectively.

Abstract: A refrigerant channel switching unit is disposed between a heat source unit and a utilization unit to switch flow of refrigerant in the refrigerant circuit. The refrigerant channel switching unit includes a first refrigerant pipe connected to a suction gas communicating pipe, a second refrigerant pipe connected to a high-low pressure gas communicating pipe, third and fourth refrigerant pipes, and first and second electric valves mounted to the first and second refrigerant pipes, respectively. The third refrigerant pipe is connected to the first and second refrigerant pipes and a gas pipe. The fourth refrigerant pipe is connected at ends to a liquid communicating pipe and a liquid pipe. A minute channel is formed in the first or second electric valve. The minute channel enables the refrigerant to flow through the minute channel even when an opening degree of the valve is set to be the lowest degree.

Abstract: A refrigerant channel switching unit is disposed between a heat source unit and a utilization unit to switch flow of refrigerant in the refrigerant circuit. The refrigerant channel switching unit includes a first refrigerant pipe connected to a suction gas communicating pipe extending from the heat source unit, a second refrigerant pipe connected to a high-low pressure gas communicating pipe extending from the heat source unit, a third refrigerant pipe connected to a gas pipe extending to the utilization unit, a coupling portion, a first switch valve mounted to the first refrigerant pipe, and a second switch valve mounted to the second refrigerant pipe. The coupling portion is connected to the first, second and third refrigerant pipes. The First second and third are coupled through the coupling portion.

Abstract: Provided is a refrigerant channel switching unit including a unit case having a case body and an electrical component box attached to the case body, and a channel switching valve housed in the unit case. The electrical component box is attachable to the case body at a first position, where the electrical component box blocks one of faces of the case body entirely, and a second position, where a maintenance opening is formed in a part of the one face of the unit case. The electrical component box may be retained temporarily at the second position so as to facilitate the maintenance of the channel switching valve.

Abstract: An aggregated channel switching unit is disposed between a heat source unit and a plurality of utilization units to switch flow of refrigerant in the refrigerant circuit. The aggregated channel switching unit including a plurality of first refrigerant pipes having switch valves, a plurality of second refrigerant pipes, and a casing accommodating the first and second pipes. The first and second pipes are aggregated as an assembly. The first pipes are connected to a high-low pressure gas communicating pipe and a suction gas communicating pipe extending from the heat source unit. The second refrigerant pipes are connected to a liquid communicating pipe extending from the heat source unit and a liquid pipe extending to the utilization units. Adjacent pairs of the first and second pipes extend approximately in parallel to each other at predetermined intervals in the assembly. The first and second pipes are alternately disposed in the assembly.

Abstract: A refrigerant channel switching unit is disposed between a heat source unit and a utilization unit to switch flow of refrigerant in the refrigerant circuit. The refrigerant channel switching unit includes a first refrigerant pipe connected to a suction gas communicating pipe extending from the heat source unit, a second refrigerant pipe connected to a high-low pressure gas communicating pipe extending from the heat source unit, a third refrigerant pipe connected to a gas pipe extending to the utilization unit, a coupling portion, a first switch valve mounted to the first refrigerant pipe, and a second switch valve mounted to the second refrigerant pipe. The coupling portion is connected to the first, second and third refrigerant pipes. The first second and third are coupled through the coupling portion.

Abstract: An aggregated channel switching unit is disposed between a heat source unit and a plurality of utilization units to switch flow of refrigerant in the refrigerant circuit. The aggregated channel switching unit including a plurality of first refrigerant pipes having switch valves, a plurality of second refrigerant pipes, and a casing accommodating the first and second pipes. The first and second pipes are aggregated as an assembly. The first pipes are connected to a high-low pressure gas communicating pipe and a suction gas communicating pipe extending from the heat source unit. The second refrigerant pipes are connected to a liquid communicating pipe extending from the heat source unit and a liquid pipe extending to the utilization units. Adjacent pairs of the first and second pipes extend approximately in parallel to each other at predetermined intervals in the assembly. The first and second pipes are alternately disposed in the assembly.

Abstract: A refrigerant channel switching unit is disposed between a heat source unit and a utilization unit to switch flow of refrigerant in the refrigerant circuit. The refrigerant channel switching unit includes a first refrigerant pipe connected to a suction gas communicating pipe, a second refrigerant pipe connected to a high-low pressure gas communicating pipe, third and fourth refrigerant pipes, and first and second electric valves mounted to the first and second refrigerant pipes, respectively. The third refrigerant pipe is connected to the first and second refrigerant pipes and a gas pipe. The fourth refrigerant pipe is connected at ends to a liquid communicating pipe and a liquid pipe. A minute channel is formed in the first or second electric valve. The minute channel enables the refrigerant to flow through the minute channel even when an opening degree of the valve is set to be the lowest degree.

Abstract: An outdoor unit of an air conditioning device in which a compressor, a heat exchanger, and a fan are accommodated in a casing including a top plate, side plates, and a bottom plate is provided. The top plate is formed in a rectangular shape, and a flat mount surface is formed in each of corner portions of the top plate. Regarding each of sides of the top plate, an intermediate part excluding the corner portions serves as a retreat portion set back to the side of the device, and an end of the retreat portion and the mount surface are connected by a standing surface.