The TC1 temperature control series is designed for 2 pipe, 4 pipe fan coil systems and heat pump systems. It is a precision temperature control series. It controls the HVAC system so room/building temperatures are precisely maintained. This series has diagnostic capabilities which will indicate when the HVAC system operation and efficiency levels are not performing at peak levels. When key components begin to fail or not perform properly, they are identified by LED indicators or LCD icon messages. If the equipment operation gets to a critical level all system operations will be shut down.