An electronic temperature controller with 3 point output, working on 24V AC, shall be used to modulate the 2 position reversible motor of 2/3 way mixing/diverting valves of AHU. The sensing element of electronic temperature controller shall be a precalibrated NTC thermistor sensor mounted either within the controller or in the return air duct. The range of the electronic temperature controller shall be 15°-35° C with a differential of 1°C.