Patent ID: 7730935
Filing Date: 2010-06-08
Classification: F24F

Abstract:
1. A control system for controlling a hydronic system having both a heating source capable of heating water to be delivered over a piping line to a plurality of heat exchangers and a cooling source capable of cooling water to be delivered over the same piping line to the plurality of heat exchangers, said control system comprising: a plurality of zone controllers, each zone controller connected to a respective heat exchanger so as to control the delivery of water over the piping line to the respective heat exchanger, each zone controller being operative to generate a demand signal corresponding to a request for one of heated water, cooled water or no water; a hydronic temperature sensor disposed in the piping line and configured to generate a sensed water temperature; and a hydronic system controller in communication with each of said zone controllers and operatively coupled to the hydronic temperature sensor, said hydronic system controller being operative to periodically receive the demand signal from each zone controller determine whether a predominance of the demand signals are requests for heating or cooling, and to activate, only if the sensed water temperature of the circulating water is within a predefined temperature range, either the heating source when a predominance of demand signals are for heating or the cooling source when the predominance of demand signals are for cooling.