A condensate drain assembly for use with a horizontally oriented multi-poise heat exchanger includes a first drain pan having a first hollow interior configured to receive an apex of the multi-poise heat exchanger therein. The first drain pan has a generally vertical orientation. A second drain pan has at least one second drain and a second hollow interior for receiving condensate therein. The second hollow interior is configured to receive a header of the multi-poise heat exchanger therein. The second drain pan has a generally horizontal orientation and the first hollow interior is fluidly connected to the second hollow interior.

A heat exchange unit includes a housing having an inflow air passage communicating with an air inlet, and an outflow air passage communicating with an air outlet, a first partition plate that partitions an inside of the housing into the inflow air passage and the outflow air passage, a bellmouth disposed around an opening formed in the first partition plate, a centrifugal fan disposed on the first partition plate via the bellmouth, and a heat exchanger disposed on a downstream side of the centrifugal fan in the housing. The air inlet is open at any surface of the housing having the inflow air passage. The air outlet is open at any side surface of the housing having the outflow air passage. The inflow air passage is formed between a fan inlet and a main plate closest to the fan inlet to reach a rear surface. The fan inlet is an air inlet of the centrifugal fan.

A cooling system includes a cooling device having a first cooling coil and a second cooling coil, a first heat transfer fluid in fluid communication with the first cooling coil, a second heat transfer fluid in fluid communication with the second cooling coil, a first heat exchanger in fluid communication with the first heat transfer fluid and the second heat transfer fluid, a second heat exchanger in fluid communication with the second heat transfer fluid and a source of external air, a system of fluid control devices in fluid communication with the second heat transfer fluid and configured to minimize a change in a total pressure drop of the second heat transfer fluid when the cooling system switches between operating modes, and a controller configured to selectively control the cooling device and the system of fluid control devices to operate the cooling system in each of the operating modes.

A cooling system includes a cooling device having a first cooling coil and a second cooling coil, a first heat transfer fluid in fluid communication with the first cooling coil, a second heat transfer fluid in fluid communication with the second cooling coil, a first heat exchanger in fluid communication with the first heat transfer fluid and the second heat transfer fluid, a second heat exchanger in fluid communication with the second heat transfer fluid and a source of external air, a system of fluid control devices in fluid communication with the second heat transfer fluid and configured to minimize a change in a total pressure drop of the second heat transfer fluid when the cooling system switches between operating modes, and a controller configured to selectively control the cooling device and the system of fluid control devices to operate the cooling system in each of the operating modes.

A heat exchanger placed in front of an air blower is appropriately supported by a cabinet. In an indoor unit, the heat exchanger is placed only in front of a rotation center of an air-blowing fan. The cabinet includes: an upper left protrusion and an upper right protrusion protruding forward from an upper portion of the cabinet; and a lower left protrusion and a lower right protrusion protruding forward from a lower portion of the cabinet, so that the protrusions support the heat exchanger.

A heat exchanger placed in front of an air blower is appropriately supported by a cabinet. In an indoor unit, the heat exchanger is placed only in front of a rotation center of an air-blowing fan. The cabinet includes: an upper left protrusion and an upper right protrusion protruding forward from an upper portion of the cabinet; and a lower left protrusion and a lower right protrusion protruding forward from a lower portion of the cabinet, so that the protrusions support the heat exchanger.

A refrigeration cycle apparatus (1) is capable of performing a refrigeration cycle using a small-GWP refrigerant. The refrigeration cycle apparatus (1) includes a refrigerant circuit (10) and a refrigerant enclosed in the refrigerant circuit (10). The refrigerant circuit includes a compressor (21), a condenser (23), a decompressing section (24), and an evaporator (31). The refrigerant contains at least 1,2-difluoroethylene.

A refrigeration cycle apparatus (1) is capable of performing a refrigeration cycle using a small-GWP refrigerant. The refrigeration cycle apparatus (1) includes a refrigerant circuit (10) and a refrigerant enclosed in the refrigerant circuit (10). The refrigerant circuit includes a compressor (21), a condenser (23), a decompressing section (24), and an evaporator (31). The refrigerant contains at least 1,2-difluoroethylene.

An air conditioning system includes: a burner unit having a burner and a first casing housing the burner and having an air inlet; and a heat exchanger unit having a heat exchanger through which flammable refrigerant passes, a second casing housing the heat exchanger, and a connection portion connected to a refrigerant connection pipe extending from a heat source unit. The first casing has a first surface, the second casing is disposed to overlap a part of the first surface, the first surface includes a first portion that overlaps the second casing and a second portion not overlapping the second casing. The connection portion is disposed in the second casing to project onto the second portion of the first casing. The air inlet is provided on a surface that is other than the second portion and is at least one of a plurality of surfaces adjacent to the first surface.

A dehumidification system includes a compressor, a primary evaporator, a primary condenser, a secondary evaporator, and a secondary condenser. The secondary evaporator receives an inlet airflow and outputs a first airflow to the primary evaporator. The primary evaporator receives the first airflow and outputs a second airflow to the secondary condenser. The secondary condenser receives the second airflow and outputs a third airflow to the primary condenser. The primary condenser receives the third airflow and outputs a dehumidified airflow. The compressor receives a flow of refrigerant from the primary evaporator and provides the flow of refrigerant to the primary condenser.