1Applicable Scenarios: Temperature control of central air conditioning system, water heating system, electric heating system. 2Functions: Temperature detection, temperature compensation, user settings, fan settings, overheat protection, antifreeze, etc. 3Household Thermostat: Built in high accuracy NTC temperature sensor, intelligent temperature control and adjustment. 4High Quality: Made of premium PC and ABS material, sturdy and durable in use. 5Working Principle: By comparing the data set by the user, the corresponding control signal is output in the setting mode to control the electric valve or fan. Item Type: Thermostat Model: 8819H Material: PC + ABS Gross Weight: Approx. 181g / 6.4oz Control Type: Temperature Control Mode: Intelligent Temperature Control Regulator Measurement Object: Environment, Object Input Voltage: AC220V Temperature Range: 5-45 () Load Output Power: Plumbing 220V AC/3A Electric Heater 220V AC/25A Temperature Measurement Error: 1 () Hole Size: Approx. 60mm / 2.4in Installation Type: Concealed Output Signal: 250000 (mA) Working Voltage: 220 (V) 1 x Thermostat 2 x Screw Thermostat installation1. Disassemble the main control board and use a 3.5mm wide flathead screwdriver to extend it to the slot along the slope2. Remove the 4mm of the cable and pry up slightly to open the card slot3. Use a screwdriver to tighten after connecting the terminals according to the wiring diagram4. Install the connected thermostat on the press box to use