Air conditioner and control method thereof

1. An air conditioner comprising:

a water tank to store water;

a visual body disposed over the water tank and formed of a transparent material;

a watering housing to draw water stored in the water tank and to spray the drawn water to the visual body;

a water level sensor to measure a water level of the water tank in a multi-stage;

a top cover assembly disposed over the visual body and having a water supply hole to supply water to the water tank;

a water level display unit disposed beside the water supply hole of the top cover assembly to display a water level measured by the water level sensor in a multi-stage;

a lower humidification medium disposed between the visual body and the water tank, the lower humidification medium containing moisture and humidifying passing-through air;

a upper humidification medium separably disposed at the upper side of the visual body, the upper humidification medium containing moisture and humidifying passing-through air; and

wherein the watering housing sprays water to the visual body to supply moisture to the upper humidification medium and the lower humidification medium.

2. An air conditioner of claim 1 , wherein:

the water tank comprises a floater to move vertically according to a water level of the water tank and to generate a magnetic force,

the water level sensor comprises a plurality of hole sensors to detect a magnetic force generated by the floater and to output a signal, and

at least one of the plurality of hole sensors detects a magnetic force generated by the floater to output a signal.

3. The air conditioner of claim 2 , further comprising a control unit to receive a signal from the water level sensor to determine a water level of the water tank,

wherein:

when there is one hole sensor outputting a signal among the plurality of hole sensors, the control unit determines a water level of the water tank by the one hole sensor outputting the signal and displays the determined water level on the water level display unit, and

when there are two hole sensors outputting signals among the plurality of hole sensors, determines a water level of the water tank by the hole sensor disposed higher between the two hole sensors outputting the signals and displays the determined water level on the water level display unit.

4. The air conditioner of claim 3 , further comprising a watering motor to rotate the watering housing,

wherein when is the control unit determines that there is no water in the water tank, the control unit stops an operation of the watering motor.

5. The air conditioner of claim 1 , further comprising a control unit to wait for a water level display change time after the water level sensor measures a water level drop of the water tank and to change a water level displayed on the water level display unit.

6. The air conditioner of claim 5 , wherein the control unit calculates the water level display change time from an unmeasurable amount, that is the amount of water recovered in the water tank after the stopping of the operation of the watering motor, and an evaporation rate, that is the amount of evaporated water per hour due to humidification.

7. A control method of an air conditioner comprising a water tank to store water, a visual body disposed over the water tank and formed of a transparent material, a watering housing to draw water stored in the water tank and to spray the drawn water to the visual body, a lower humidification medium disposed between the visual body and the water tank and containing moisture and humidifying passing-through air, a upper humidification medium separably disposed at the upper side of the visual body and containing moisture and humidifying passing-through air, a water level sensor comprising a plurality of hole sensors to measure a water level of the water tank in a multi-stage, a floater disposed at the water tank to move vertically according to a water level, and a water level display unit to display a water level measured by the water level sensor in a multi-stage, the control method comprising:

when there is one hole sensor outputting a signal by detecting a magnetic force generated by the floater, determining a water level of the water tank by the one hole sensor outputting the signal; and

when there are two hole sensors outputting signals by detecting a magnetic force generated by the floater among the plurality of hole sensors, determining a water level of the water tank by the hole sensor disposed higher between the two hole sensors outputting the signals.

8. The control method of claim 7 , further comprising displaying the determined water level of the water tank on a water level display unit disposed beside a water supply hole to supply water to the water tank and to display a water level measured by the water level sensor in a multi-stage.

9. The control method of claim 7 , further comprising:

measuring, by the water level sensor, a water level drop of the water tank;

waiting for a water level display change time after measuring the water level drop of the water tank; and

displaying a water level change on the water level display unit, disposed beside the water supply hole for supplying water to the water tank, after the water level display change time.

10. The control method of claim 9 , wherein the water level display change time is calculated from an unmeasurable amount, that is the amount of water recovered in the water tank after stopping an operation of a watering motor, and an evaporation rate, that is the amount of evaporated water per hour due to humidification.

11. The control method of claim 7 , further comprising, when it is determined that there is no water in the water tank, stopping spraying water stored in the water tank.