emperature display, temperature controlling(refrigeration/heat mode can be set),compressor start delay protection, 2 defrost modes (electric heat, hot gas), 2 defrost start mode (time alternation, accumulative compressor running time), 2 defrost end mode (timing, controlled by both temperature and time), dripping, manual defrost, sensor error alarm, one external alarm input, password, C/F unit change. Technique Index 1 Temperature display range: -50ï½?150â??(The resolution is 0.1â??) -58ï½?302â??(The resolution is 0.1â??) 2 Power supply: AC 220V±10% or AC 380V±10% 50Hz (Refer to the wiring diagram) 3 Operating environment: temperature -10â??ï½?50â??, humidityâ?¤85% 4 Relay contact capability: compressor 20A/250VAC, defrost 8A/250VAC (pure resistive load) 5 Temperature sensor: NTC R25=5kΩ, B (25/50) =3470K -