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1- DESCRIPTION MT-444 is a fully parametric digital temperature controller, specifically developed for refrigeration applications. The touch keys allow the selection of the required recipe, enabling/disabling of the economy mode, among other functions. The controller is divided into two parts: Frontal module and power module. The frontal module contains the connections for the temperature sensors, door switch, and TTL serial port. The power module contains the four relay outputs and can directly drive the compressor (COMP), light (LIGHT), defrost (DEFR), and fan (FANS). Aswitch for open door detection can be connected to the digital input. MT-444 has a normal operation setpoint and an economy setpoint with the respective hysteresis for each of the three recipes. 2 - APPLICATION - Beer and soft drink displays - Cold or frozen counters 3. TECHNICAL SPECIFICATIONS -Power supply: 90 ~ 264Vac (50/60Hz) -Control temperature: -50 to 60°C -58 to 99 °F -Resolution: 0.1°C between -9.9 to 9.9 °C and 1°C in the rest of the range 1°F in all range -Realys maximum current: 10(8)A / 250Vac 1HP - compressor output 7A / 250Vac - defrost output 3(2)A / 250Vac 1/10HP - fan output 2(2)A / 250Vac - light output -Digital inputs: Switch - input for open door detection (dry contact type) -Operating temperature: 0 to 45°C -Operating Humidity: 10 to 90% RH (without condensation)
