The W-TC6 is a microprocessor based digital controller designed for refrigerator systems. It is particularly suited for medium or low temperature “force air” units. The temperature control is always subject to a positive temperature differential (make on rise); the compressor stops when set-point is reached and start again upon reaching the set-point temperature plus the differential and compressor protection time can be adjusted from 0 to 15 min. Set min and max acceptable value for set point. It is provided with NTC thermostatic probe input and four relay outputs for compressor, evaporator fan management, light1 and light2. The defrost cycles can be controlled at time intervals. Programming is easily to access by holding the “SET” button down for more than 3 seconds. The value of the probe‘s reading is viewed on a display by three digits and a minus sign.