Features: * * For controlling the return temperature. RTL is a controller that maintains the desired temperature of the water in the underfloor heating system. Used to maintain temperature in mixed heating systems, underfloor heating systems, and radiators. * RTL is an automatic controller to regulate the temperature of the return water from the radiator or a floor heating circuit. Temperature is transferred from the valve body to the sensor. If the temperature on the valve body is lower than the water temperature, the controller closes; if higher, it opens. Specifications: * Material: Plastic + brass * Color: White, as shown * Size: As shown * Connection diameter: 3/4 inch, DN20 * Connection head: M30x1.5 * Closing dimension: 11.5 mm Installation and temperature setting: 1. Install the temperature control valve on the radiator inlet pipe using the connecting screw. 2. The temperature control valve must be installed in a location with direct contact with room air. Do not install inside a heater cover or enclosure. 3. For proper operation, install the thermostatic head horizontally to accurately sense ambient temperature. Vertical installation may affect performance. 4. During sensor installation: set the housing scale to 5 to fully open the valve. Place it on the valve body, align correctly, and tighten the coupling cap promptly. Temperature adjustment: 1. Turn the adjusting sleeve counterclockwise to position 5 to fully open the valve. 2. Tighten the connecting copper sleeve clockwise. 3. Rotate the adjusting sleeve to set the desired room temperature between * and 5. 4. Recommended setting for nighttime or sleeping hours. 5. Use lowest setting when away or during ventilation. 6. Normal heating setting for regular use. 7. Warm season setting for mild weather. Package Contents: 1 pc x Thermostatic valve Note: 1. The actual color may vary slightly from the images due to monitor brightness or lighting conditions. 2. Please allow slight variation due to manual measurement.