PURPOSE: To obtain dehumidified air having an optimum temperature by providing a controller which controls the heating amount of a refrigerant heater so that differential temperature between the detected temperatures of a suction air temperature sensor and an outlet air temperature sensor of each indoor heat exchanger becomes a target value during dehumidifying operation.
CONSTITUTION: When dehumidifying operation mode is set by an operating device 31, a refrigerant heater 5 is brought in operation, an electronic expansion valve 10 is opened full and an electronic expansion valve 15 is throttled. An indoor heat exchanger 14 serves as a condenser, and an indoor heat exchanger 16 as an evaporator, so air inside a room is cooled and dehumidified by the indoor heat exchanger 16, reheated by the indoor heat exchanger 14 and blown into the room. During dehumidifying operation, an outdoor fan 23 is operated at the lowest speed, and a proportional control valve 8 is regulated to control the firing rate of a burner 6 of the refrigerant heater 5, so that differential temperature ΔTa between detected temperature Ta2 of an outlet temperature sensor 36 and the detected temperature Ta1 of a suction temperature sensor 35 becomes a target value. There are three sorts of the target value: for warmer dehumidifying, normal dehumidifying and cooler dehumidifying, and a target value is selected corresponding to the mode set by the operating device 41.
| JP2005083721 | AIR CONDITIONER |
| JPH08303837 | COOLING/HEATING AIR-CONDITIONER |
| JPS5984343 | [Title of the device] A control device of an air harmony machine |
KUROYANAGI HIROAKI
SUMITANI SHIGETO
FUJITA MIKI
FUKUNAGA HIDEAKI
TOSHIBA AVE KK