METHODS AND SYSTEMS FOR CONTROLLING AIR CONDITIONING SYSTEMS HAVING A COOLING MODE AND A FREE-COOLING MODE

摘要

A method of controlling an air conditioning system having a cooling mode and a free-cooling mode, including activating the air conditioning system; measuring a first temperature of ambient air surrounding a condenser; measuring a second temperature of the working fluid; calculating a difference between the first and second temperatures; and comparing the difference to a predetermined value, wherein if the difference is greater than or equal to the predetermined value the free-cooling mode is activated, and wherein if the difference is less than the predetermined value the cooling mode is activated.