Indoor unit, air conditioner including indoor unit and method of controlling air conditioner

1. An in-ceiling embedded indoor unit of an air conditioner including an air blower and an indoor heat exchanger accommodated in a housing having a box-shape, comprising:

knock-out hole portions that are formed in side surfaces of the housing capable of being freely pushed out forming opening portions; and

a filtering unit of the indoor unit that comprises an assembly of a plate-shaped member detachable from the housing, an electrolytic bath for generating the electrolytic water by electrolyzing water, a controller controlling current supply in the electrolytic bath and a gas-liquid contact member infiltrated with the electrolytic water on an air blowing passage through which air sucked by the air blower flows in the indoor unit, the air and the electrolytic water being brought into contact with each other in the gas-liquid contact member to filter the air;

wherein the filtering unit is positioned in one of the opening portions, the plate-shaped member closing the opening portion, and the gas-liquid contact member is disposed at a downstream side of the indoor heat exchanger,

the assembly of the filtering unit having the gas-liquid contact member fixed to an inner surface of the plate-shaped member at the inside of the housing, and the electrolytic bath and the controller are fixed to the outer surface of the plate-shaped member at an outside of the housing, and

the assembly of the filtering unit is configured to be detachable from the housing.

2. The indoor unit according to claim 1 , wherein the filtering unit further comprises a water supply pipe that is disposed along a refrigerant pipe connected to the indoor heat exchanger and supplies water to the electrolytic bath.

3. The indoor unit according to claim 1 , wherein the electrolytic bath is disposed at the outside of the housing.

4. The indoor unit according to claim 3 , wherein the filtering unit further comprises a water supply pipe that is disposed along a refrigerant pipe connected to the indoor heat exchanger and supplies water to the electrolytic bath.

5. The indoor unit according to claim 1 , wherein the filtering unit comprises a drain pan that is disposed below the indoor heat exchanger and receives drain water from the indoor heat exchanger, a drain pump for discharging drain water from the drain pan, an electrolytic water supply unit for supplying the electrolytic water to the gas-liquid contact member from the upper side thereof so that the electrolytic water infiltrates the gas-liquid contact member, an electrolytic water tray that is disposed below the gas-liquid contact member and receives electrolytic water dropped from the gas-liquid contact member, and a discharge pipe for discharging electrolytic water stocked in the electrolytic water tray to the drain pan.

6. The indoor unit according to claim 5 , wherein the drain pump is disposed at one corner of the housing, and the gas-liquid contact member is disposed along a side surface of the housing so as to be adjacent to the locating position of the drain pump.

7. The indoor unit according to claim 5 , wherein the filtering unit further comprises a circulating and supplying unit for circulating and supplying electrolytic water stocked in the electrolytic water tray to the gas-liquid contact member.

8. The indoor unit according to claim 5 , wherein the discharge pipe is equipped with a flow rate control valve, and the controller controls opened and closed control of the flow rate control valve.

9. The indoor unit according to claim 1 , wherein the controller is disposed on a side of the electrolytic bath and on an upper side of a water supply pipe that is installed on the plate-shaped member and that supplies water to the electrolytic bath from a lower side thereof.