Patent ID: 7797953
Filing Date: 2010-09-21
Classification: F24F

Abstract:
1. An air conditioning system comprising: at least one first air conditioning system in which an outdoor unit is connected to plural indoor units through an inter-unit pipe and the plural indoor units are allowed to execute one of cooling operation and heating operation concurrently; at least one second air conditioning system in which an outdoor unit is connected to plural indoor units through an inter-unit pipe and the plural indoor units are allowed to execute both cooling operation and heating operation in mixture concurrently; and a controller that is connected to the first and second air conditioning systems through a communication line so that communications can be performed between the controller and each of the first and second air conditioning systems, wherein the controller transmits a switching instruction signal for instructing switching of an air conditioning operation to cooling operation or heating operation through the communication line to the first and second air conditioning systems all together, wherein the switching instruction signal from the controller is transmitted through communication line to the respective outdoor units or an outdoor unit functioning as a master unit of the first air conditioning system and the respective indoor units of the second air conditioning system, and on the basis of the switching signal, air conditioning operations of the indoor units in the first air conditioning system are concurrently switched to the heating operation or the cooling operation through a switching operation of a four-way valve provided to each of the outdoor units and air conditioning operations of the indoor units in the second air conditioning system are concurrently switched to the heating operation or the cooling operation through an opening/closing operation of a first opening/closing valve and a second opening/closing valve provided to each of the indoor units so that the heating operation and the cooling operation are mixed with each other.