A drying appliance includes a cabinet. A drum processes articles of laundry. The drum is positioned for rotational operation within the cabinet. A blower directs process air through a recirculating airflow path that includes the drum. The drum and the blower are activated in an operating state and deactivated in an idle state. A first operable vent is positioned proximate a front of the cabinet. A second operable vent is positioned proximate a rear of the cabinet. The first and second operable vents define an open position after the drum and the blower define the idle state. The first and second operable vents define a closed position after the drum and the blower define the operating state.

A control method for a laundry treating apparatus comprises a washing machine power supply step of supplying a power to a washing machine interface provided to receive a control command; a course execution step of executing a washing course by the washing machine if the washing course is input to the washing machine interface; a dryer power supply step of supplying the power to the dryer if a preheating request signal is input through the washing machine interface; and a preheating step of including a supply stroke of supplying the air to the drying drum and a heating stroke of heating the air supplied to the drying drum.

A control method for a laundry treating apparatus comprises a washing machine power supply step of supplying a power to a washing machine interface provided to receive a control command; a course execution step of executing a washing course by the washing machine if the washing course is input to the washing machine interface; a dryer power supply step of supplying the power to the dryer if a preheating request signal is input through the washing machine interface; and a preheating step of including a supply stroke of supplying the air to the drying drum and a heating stroke of heating the air supplied to the drying drum.

A laundry treating apparatus includes a drum, a duct circulating air through the drum, a heat exchanger in the duct, a water collector configured to water separated from air through the heat exchanger, a spray configured to spray water to the heat exchanger, a pump housing that is connected to the water collector and defines first and second pump outlets, an impeller moving water in the pump housing to the first pump outlet, a drainage housing, a housing connecting pipe connecting the second pump outlet to the drainage housing, a drain pipe discharging water in the drainage housing, and a drain valve controlling the drain pipe, and a switch housing connected to the first pump outlet, a first supply pipe connecting the switch housing to the spray, a second supply pipe connecting the switch housing to the drain pipe, and a switch valve controlling the first and second supply pipes.

A laundry treating apparatus includes a drum, a duct circulating air through the drum, a heat exchanger in the duct, a water collector configured to water separated from air through the heat exchanger, a spray configured to spray water to the heat exchanger, a pump housing that is connected to the water collector and defines first and second pump outlets, an impeller moving water in the pump housing to the first pump outlet, a drainage housing, a housing connecting pipe connecting the second pump outlet to the drainage housing, a drain pipe discharging water in the drainage housing, and a drain valve controlling the drain pipe, and a switch housing connected to the first pump outlet, a first supply pipe connecting the switch housing to the spray, a second supply pipe connecting the switch housing to the drain pipe, and a switch valve controlling the first and second supply pipes.

A control method for a laundry treating apparatus comprises a first communication step of notifying a dryer of a washing course by a washing machine if the washing course is input through a washing machine interface provided to receive a control command; a course selection step of selecting any one of a plurality of drying courses set to the dryer by the dryer; and a predicted time transmission step of transmitting a sum of a washing time set to the washing course and a drying time set to the drying course to a terminal provided to perform communication with at least any one of the washing machine and the dryer through wire or wireless communication.

A control method for a laundry treating apparatus comprises a first communication step of notifying a dryer of a washing course by a washing machine if the washing course is input through a washing machine interface provided to receive a control command; a course selection step of selecting any one of a plurality of drying courses set to the dryer by the dryer; and a predicted time transmission step of transmitting a sum of a washing time set to the washing course and a drying time set to the drying course to a terminal provided to perform communication with at least any one of the washing machine and the dryer through wire or wireless communication.

A washing and drying machine includes: a washing drum for accommodating the washings and rotating under a driving force of a motor; an air supply portion for supplying air into the washing drum; a heating portion configured to heat the air to be supplied into the washing drum when turned on and stop heating when turned off; and a control portion for controlling the motor, the air supply portion and the heating portion to execute a washing and drying operation. A drying procedure in the washing and drying operation includes main drying treatment repeated for multiple times. During each time of the main drying treatment, the control portion is configured to keep the heating portion being on within a first period, and keep the heating portion being off within a second period different from the first period, and the second period is longer than the first period.

A washing and drying machine includes: a washing drum for accommodating the washings and rotating under a driving force of a motor; an air supply portion for supplying air into the washing drum; a heating portion configured to heat the air to be supplied into the washing drum when turned on and stop heating when turned off; and a control portion for controlling the motor, the air supply portion and the heating portion to execute a washing and drying operation. A drying procedure in the washing and drying operation includes main drying treatment repeated for multiple times. During each time of the main drying treatment, the control portion is configured to keep the heating portion being on within a first period, and keep the heating portion being off within a second period different from the first period, and the second period is longer than the first period.

A clothes drying system includes an apparatus that comprises a drying air circuit. A temperature sensor provides a signal indicative of a temperature of an environment outside the apparatus. A memory and processing circuitry is coupled to the memory. The memory includes logic that, when executed by the processing circuitry, directs at least one of: (i) a vent air control valve to change an amount of heated air flowing from the drum through the vent air control valve and into the environment based on the signal from the temperature sensor, (ii) a fan to change a flow rate of air flowing through the drying air circuit based on the signal from the temperature sensor, and (iii) a heater to change an amount of heat provided to the air flowing through the drying air circuit based on the signal from the temperature sensor.