The product is designed to control air-source heat pump water heaters. The multi-function design supports auxiliary heating function, waterflow warning, ventilation pump control, antifreeze function, sensors failures action, auto defrost and timer defrost function, auto restart function, exhaustion temperature protections, compressor delay and pressure protections. Features: Multifunction Design: with waterflow auditing, ventilation pump control, sensors failures action function. Temperature Inquiry: Support checks the temperature of all sensors, and the results keeps displaying for 3 seconds. Water Temperature Setting: support set the temperature and with the setting ranges of 10℃-70℃, the factory setting is 40℃. Two Working Mode Design: there are two working modes of AUTO and SAVE for you to adjust. AUTO mode: keep heating according to the setting. SAVE mode: only heating within three set periods. You can adjust it to suit your needs. Multiple Control Function: Equipped with temperature control, aux electrical heaters control, and water ventilation pump control function. Winter Antifreezing Auto Defrost Timer Defrost Function: when the outdoor temperature is 2℃, it will operate anti-freezing pumping, the pump runs 3 minutes for every 30 minutes; it will automatically stop when 3℃. When the temperature is -9~0℃ starts defrosting, and when the temperature is 2-30℃ stops defrosting. Multiple Protections Warning Function: Support exhaust temperature protections function, high pressure and low pressure warning and protections, compressor delay protections, and water sensors failure warning. Auto Restart Restore: with auto restart after power off, support for on/off power failure memory function, and support for recovery to factory settings. Specifications: Name: Water Heating Controller Material: printed circuit board Setting ranges: 10℃ to 70℃ Display ranges: -40℃ to 130℃ Working temperature: 0-50℃ Storage temperature: -10℃ to 60℃ Ambient humidity: 20-85%RH without dew Power supply: 220VAC 10%, 50/60Hz Outputs: Compressor 30A; Heaters 8A; Others 3A Hysteresis: 2~10℃ Water sensors calibration: -9.9~ 9.9℃ Heater energized from: -5~ 25℃ Defrost starting time: 10- 90min Defrost starting temperature: -9~0℃ Defrost stop temperature: 2~30℃ Maximum defrost time: 2-15min Exhaust protections temperature: 50 ~ 125℃ Item size: Display panel: 86 * 86mm / 3.39 * 3.39in Mainboard: 105 * 90 * 35mm / 4.13 * 3.54 * 1.39in Package size: 225 * 185 * 65mm / 8.86 * 7.28 * 2.56in Package weight: 651g / 1.44lb Packing List: 1 * Mainboard 1 * Display Panel 4 * Temperature Sensors