Patent ID: 6928132

Claim:
A method for operating a system that includes a plurality of valves, dampers, motors, and pumps, the system is operable in a plurality of operating modes that each include interlocks between the modes, said method comprising: operating the system in a first operating mode, the first operating mode comprising a predetermined configuration of valves, dampers, motors, and pumps; selecting a second operating mode to switch the system operation to; receiving a signal indicative of the system meeting permissive requirements for entering the selected mode; initiating a predetermined time delay greater than zero time; resetting the selected operating mode during the time delay; and switching the system to a second operating mode without going to a standby mode, the second operating mode comprising a predetermined configuration of valves, dampers, motors, and pumps different than the first mode, and wherein at least one of the valves, dampers, motors, or pumps is positioned to a different operating position in the second operating mode than that respective valve, damper, motor, or pump was positioned for operation during the first operating mode.