A heating, ventilation, and air-conditioning (HVAC) conduit includes a first HVAC line at least partially nested within a second HVAC line having a configuration defining a U- or C-shaped receiver in cross-section. The first HVAC line is fabricated of a first material and the second HVAC line is fabricated of a second material that is different from the first material.

The present invention relates to a composite coating for an inner tube delimiting a passageway for a fluid for obtaining a pipe for conveying fluids in HVACR systems.

An air conditioner that includes a refrigerant circuit connecting a plurality of indoor heat exchangers in parallel and is able to complete collection of refrigerant to the side of an outdoor heat exchanger in a shorter time when the refrigerant has leaked at any indoor heat exchanger is provided. Thus, in the air conditioner according to the present invention, when refrigerant leak is detected by a refrigerant leak sensor provided in an indoor unit and refrigerant leak is not detected by a refrigerant leak sensor provided in an indoor unit, an indoor LEV and a cutoff valve are closed to isolate an indoor heat exchanger of the indoor unit from the refrigerant circuit in a refrigerant pump-down operation. When refrigerant leak is detected by the refrigerant leak sensor and refrigerant leak is not detected by the refrigerant leak sensor, an indoor LEV and a cutoff valve are closed.

An air conditioner that includes a refrigerant circuit connecting a plurality of indoor heat exchangers in parallel and is able to complete collection of refrigerant to the side of an outdoor heat exchanger in a shorter time when the refrigerant has leaked at any indoor heat exchanger is provided. Thus, in the air conditioner according to the present invention, when refrigerant leak is detected by a refrigerant leak sensor provided in an indoor unit and refrigerant leak is not detected by a refrigerant leak sensor provided in an indoor unit, an indoor LEV and a cutoff valve are closed to isolate an indoor heat exchanger of the indoor unit from the refrigerant circuit in a refrigerant pump-down operation. When refrigerant leak is detected by the refrigerant leak sensor and refrigerant leak is not detected by the refrigerant leak sensor, an indoor LEV and a cutoff valve are closed.

A refrigeration apparatus includes: a casing that houses a compressor therein; a four-way switching valve; an accumulator; a first pipe that causes a refrigerant to flow between the four-way switching valve and a discharge portion of the compressor; and a second pipe that causes a refrigerant to flow between the four-way switching valve and the accumulator. The four-way switching valve, the first pipe, and the second pipe are all made of stainless steel.

An air conditioner comprises a compressor configured to have an inlet, through which a refrigerant is sucked in, the sucked refrigerant being compressed by the compressor, and an outlet, through which the compressed refrigerant is discharged, a four-way valve configured to switch flow paths in cooling and heating operations, the four-way valve having a valve body, a D port protruding from the valve body in a first direction to be connected to the outlet, and an S port 26 protruding from the valve body in a second direction, which is opposite to the first direction, to be connected to the inlet, and a compressor pipe having a discharging pipe to connect the outlet and the D port and a sucking pipe to connect the inlet and the S port, one of the discharging pipe and the sucking pipe has two curved portions and the other has one curved portion.

An air conditioner comprises a compressor configured to have an inlet, through which a refrigerant is sucked in, the sucked refrigerant being compressed by the compressor, and an outlet, through which the compressed refrigerant is discharged, a four-way valve configured to switch flow paths in cooling and heating operations, the four-way valve having a valve body, a D port protruding from the valve body in a first direction to be connected to the outlet, and an S port 26 protruding from the valve body in a second direction, which is opposite to the first direction, to be connected to the inlet, and a compressor pipe having a discharging pipe to connect the outlet and the D port and a sucking pipe to connect the inlet and the S port, one of the discharging pipe and the sucking pipe has two curved portions and the other has one curved portion.

A tube guide for a heating, ventilation, and/or air conditioning (HVAC) system includes a main body formed from a pliable material, a first slit formed through the main body, and a second slit formed through the main body and traversing the first slit to define a tube support location configured to receive a range of tube sizes.

A tube guide for a heating, ventilation, and/or air conditioning (HVAC) system includes a main body formed from a pliable material, a first slit formed through the main body, and a second slit formed through the main body and traversing the first slit to define a tube support location configured to receive a range of tube sizes.

A pipe joint structure includes: a union; a flare nut that includes a female thread formed at one of axially opposite ends of the flare nut, and a first annular surface formed at the other of the axially opposite ends of the flare nut; a cylindrical sleeve that houses the flare nut such that the flare nut can be rotate and moved forward and backward; a rotary ring that has a second annular surface located to face the first annular surface, and is attached to the sleeve such that the rotary ring can be rotated for the union; and a pressing member that presses the flare nut toward the rotary ring. At the second annular surface, a claw is formed in such a manner as to protrude towards the flare nut. The first annular surface includes an engagement surface that is formed in such a manner to face one side in a circumferential direction and a helically inclined surface that is adjacent to the engagement surface in the circumferential direction and formed helically in such a way as to incline and face the opposite side of the one side in the circumferential direction.