The ceiling concealed air-conditioning apparatus includes: a body containing a heat exchanger, a fan and an opening port; a decorative panel disposed below the body and configured to cover a periphery of the opening port; and a suction grille including, a rotary shaft attachable to the decorative panel and being configured to cover the opening port, wherein the suction grille includes: a locking element mounted on the suction grille so that it can slide and configured to be locked with the decorative panel; plate springs on respective sides of the locking element perpendicular to a sliding direction of the locking element and extending vertically in opposite directions; and spring supports configured to support both end faces of the respective plate springs at different positions, the plate springs include a long plate spring and a short plate spring placed such that the long plate spring engages the decorative panel first.

An air conditioner includes a housing having a first outlet and a second outlet, a first channel communicating with the first outlet, a second channel communicating with the second outlet, a tank unit configured to hold water for cooling first air and second air, the first air flowing through the first channel, the second air flowing through the second channel, a cooling unit configured to cool the first air by heat of vaporization of water held in the tank unit, a water supply channel for supplying water held in the tank unit to the cooling unit, and a water recovery channel for collecting water remaining in the cooling unit to the tank unit.

A heat pump including a refrigerant circuit configured to circulate flammable refrigerant, and an indoor unit configured to be arranged in an indoor space. The refrigerant circuit has a compressor, a utilisation-side heat exchanger, an expansion device and a heat-source-side heat exchanger connected by piping. The an indoor unit includes an outer casing having a top, and a sealed container accommodated in the outer casing. The sealed container has a bottom and a top and accommodates at least one of the compressor, the utilisation-side heat exchanger, the expansion device, and the heat-source-side heat exchanger. The sealed container has a release opening to exhaust leaking refrigerant to an exterior of the outer casing of the indoor unit.

An air conditioner indoor unit includes a housing and a chassis connected to the housing. The chassis and the housing form a receiving chamber with an access opening. At least a portion of an inner side surface of a bottom wall of the chassis forms a guiding surface extending to the access opening. The chassis includes an avoidance hole and a resilient member. At least a portion of the resilient member is arranged in the avoidance hole and protrudes from the guiding surface.

A cover is provided for an air conditioner of an enclosure. The cover can include a top wall and first and second side walls that at least partly define an interior compartment of the cover. The cover can further include a tab extending from the top wall into the interior compartment, a first side clip extending obliquely from the first side wall into the interior compartment, and a second side clip extending obliquely from the second side wall to the interior compartment. The tab and side clips can be configured to engage the air conditioner to retain the cover on the air conditioner.

A cover is provided for an air conditioner of an enclosure. The cover can include a top wall and first and second side walls that at least partly define an interior compartment of the cover. The cover can further include a tab extending from the top wall into the interior compartment, a first side clip extending obliquely from the first side wall into the interior compartment, and a second side clip extending obliquely from the second side wall to the interior compartment. The tab and side clips can be configured to engage the air conditioner to retain the cover on the air conditioner.

A filter assembly for an air conditioner unit includes a filter frame defining a plurality of attachment features for engaging a plurality of mounting features defined on an inlet frame of a cabinet of the air conditioner unit to secure the filter frame over the indoor inlet. A filter screen is attached to the filter frame for filtering a flow of air through the indoor inlet and the filter frame defines a mounting bracket for a secondary air filter.

A filter assembly for an air conditioner unit includes a filter frame defining a plurality of attachment features for engaging a plurality of mounting features defined on an inlet frame of a cabinet of the air conditioner unit to secure the filter frame over the indoor inlet. A filter screen is attached to the filter frame for filtering a flow of air through the indoor inlet and the filter frame defines a mounting bracket for a secondary air filter.

A refrigerant leakage detection sensor for a heat pump includes a sensor casing, a circuit board enclosed by the sensor casing, and a gas sensor mounted on the circuit board. The gas sensor has a housing, a refrigerant reception area at an end of the housing allowing gaseous refrigerant to enter the housing, and a sensing element in the housing. The housing protrudes through an opening in the sensor casing so that the refrigerant reception area is arranged outside the sensor casing and the sensing element is positioned inside the sensor casing.

A multi-type air conditioner may include three pipes, including a high-pressure pipe, a low-pressure pipe, and a liquid line which may be connected to a plurality of indoor units, in which some of the indoor units may be operated in a cooling mode and the rest of the indoor units may be operated in a heating mode, such that waste heat from the indoor units operated in the heating mode may be recovered to be used for the indoor units operated in the cooling mode.