Control method and device for water chilling unit, water chilling unit and storage medium

The invention relates to the technical field of refrigeration equipment, and discloses a control method for a water chilling unit, the water chilling unit comprises a first filtering pipeline and a balance pipeline, the first filtering pipeline and the balance pipeline are both installed between an evaporator and a condenser and both communicate with the evaporator and the condenser, the first filtering pipeline is located below the condenser, and the balance pipeline is located below the condenser. The balance pipeline is used for balancing the pressure difference between the evaporator and the condenser, and the method comprises the steps that under the condition that the water chilling unit is shut down, the pressure difference value between the evaporator and the condenser is obtained; and according to the pressure difference value, the first filtering pipeline is controlled to be connected and disconnected so as to filter the refrigerant contained in the condenser. According to the ...