Patent ID: 7849698

Claim:
A method for configuring a controller for a closed loop refrigerant system comprising: providing a control system to control the closed loop refrigerant system, the control system comprising: an input device comprising a plurality of input lines; a controller configured to receive a plurality of input signals from the plurality of input lines of the input device, the controller comprising a plurality of output lines electrically connected to a plurality of components of the closed loop refrigerant system; and a processor functionally separate from the controller in communication with the controller, the processor comprising a signal sensing circuit, the signal sensing circuit comprising a plurality of load sensor lines connected to the plurality of input lines of the input device, the plurality of load sensor lines providing an input to the processor from the plurality of input lines; executing a configuration mode for the controller, the configuration mode comprising: activating the input device to provide at least one signal to the controller to instruct the controller to control at least one of the components of the closed loop refrigerant system; sensing whether one or more signals are present on the plurality of input lines between the input device and the controller with the plurality of load sensor lines; determining the type of closed loop refrigerant system with the processor using the sensed signals from the plurality of load sensor lines; and sending a signal from the processor to the controller with the determined type of closed loop refrigerant system; and configuring the controller to provide control signals to the plurality of components of the closed loop refrigerant system based on the determined type of closed loop refrigerant system in the signal from the processor.