SR81 Solar Water Heater Intelligent Controller for Split-Type Solar Energy Systems. All components are built to industrial-grade standards, ensuring reliable operation in cold, high-temperature, and humid environments. Equipped with a clock chip for precise timing control. Features an LCD display with a sleek design, stable performance, and easy installation, making it an ideal accessory for solar water heating systems. Main Functions: Single System (Standard Solar System with 1 Collector and 1 Water Tank) LCD Display Clock Time Setting (CLK) Timed Auxiliary Heating (THET) Circulation Pump Three-Temperature/Time Control (CIRC) Password Input (PWD) Water Tank Heating Setting (LOAD) Collector Function (COL) Collector Emergency Shutdown (OCEM) Collector Cooling (OCCO) Collector Minimum Temperature (OCMI) Collector Anti-Freeze Function (OCFR) Cooling Function (COOL) Tank Cooling (OSTC) Heat Transfer Function (OHDP) Automatic Temperature Adjustment (AH) Buzzer Fault Alarm (BEEP) Manual Function (MAN) Blocking Protection (BLPR) High-Temperature Function (OTDI) Flow Monitoring and Pump Idling Protection Celsius/Fahrenheit Unit Conversion (UNIT) Reset Function (RET) Password Setting (PASS) Manual Heating (M.H) Economic Mode Manual Start of Water Circulation Pump Holiday Function Protective Functions Power Failure Memory Protection Screen Protector Electrical Specifications: Power Input: AC 100240V ~ (5060Hz) Rated Pulse Voltage: 2.5kV Installation: Wall-Mounted Operation: 10 Push Buttons on Front Panel Protection Class: IP40 Electric Heating Capacity: 1500W Ambient Temperature Range: -10C to 50C Temperature Measurement Accuracy: 2C Temperature Display Resolution: 0.1C Collector Temperature Range: -10C to 220C Water Tank or Pipe Temperature Range: 0C to 110C Input Signals: 1 x PT1000 Temperature Sensor Input 4 x NTC10K B=3950 Temperature Sensor Inputs 1 x Rotary Vane Electronic Flowmeter (FRT) Output Signals: 3 x Electromagnetic Relays, Maximum Switching Current: 2A Color: White Material: Plastic Dimensions (Main Controller): 200 x 140 x 43 mm PT1000 Sensor Size: 6 x 50 mm Cable Length: 1.5 meters NTC10K Sensor Size: 6 x 50 mm Package Contents: 1 x Controller 1 x English Manual 1 x PT1000 Sensor 2 x NTC10K Sensors 1 x 10A Power Cord Note: The package includes only the items listed above. Other accessories are not included. Lighting and monitor differences may cause slight variations in color between the image and the actual product. Allowable measurement error: 13 cm. Please allow a tolerance of 13 mm due to manual measurement and 13g weight variation. Ensure you are comfortable with these tolerances before ordering. Shipping Information: 1. Please ensure your delivery address is complete and accurate (including name, street, house number, doorbell/email) to avoid delivery issues. 2. All orders are shipped within 3 business days after payment confirmation. Delivery typically takes 812 days, depending on location. 3. If you have any questions during the shopping process, please . We respond within 24 hours. We hope you enjoy your shopping experience!