1. Product Overview
This manual provides essential information for the installation, operation, and maintenance of your Zehnder Thermostat SH M 30 x 1.5, Model 819080. This elegant thermostat features a built-in liquid sensor for precise temperature control. It is tested according to EN215 standards and offers an adjustable temperature range from 7 to 28 degrees Celsius, including a zero position for complete shut-off. The thermostat is designed with a chrome-plated union nut and a standard M 30 x 1.5 thread connection for easy integration with compatible radiator valves.
Image 1.1: Front view of the Zehnder Thermostat SH M 30 x 1.5, Model 819080 in white. This image shows the compact design and the temperature setting dial.
2. Safety Information
- Read all instructions carefully before installation and use.
- Ensure the heating system is depressurized and cooled down before attempting installation or maintenance.
- Installation should only be performed by qualified personnel if you are unsure about the process.
- Do not attempt to modify the thermostat or its components.
- Keep packaging materials away from children.
3. Package Contents
The package should contain the following item:
- 1 x Zehnder Thermostat SH M 30 x 1.5, Model 819080 (White)
- Integrated chrome-plated union nut for mounting
4. Setup and Installation
This thermostat is designed for easy installation on radiator valves with an M 30 x 1.5 thread connection.
Installation Steps:
- Prepare the Radiator Valve: Ensure the existing thermostatic head (if any) is removed. If installing on a new valve, ensure it is properly fitted to the radiator and plumbing system.
- Position the Thermostat: Align the Zehnder thermostat with the M 30 x 1.5 thread of the radiator valve.
- Secure the Thermostat: Hand-tighten the chrome-plated union nut onto the valve thread. Do not overtighten, as this can damage the valve or thermostat. A firm hand-tightening is usually sufficient to create a secure connection.
- Check for Stability: Ensure the thermostat is firmly seated and does not wobble.
For optimal performance, ensure the thermostat is not obstructed by curtains or furniture, which could affect its ability to sense room temperature accurately.
5. Operating Instructions
The Zehnder Thermostat allows you to control the heat output of your radiator by setting the desired room temperature.
Temperature Setting:
- The thermostat has an adjustable range from 7 to 28 degrees Celsius.
- Rotate the dial on the thermostat head to select your desired temperature. The numbers or markings on the dial correspond to different temperature settings.
- Zero Position: The thermostat includes a zero position (often marked with an asterisk or '0'). Turning the dial to this position will completely close the valve, shutting off the heat to the radiator. This is useful for rooms that do not require heating or during warmer months.
- The built-in liquid sensor will react to the ambient room temperature, opening or closing the valve to maintain the set temperature.
6. Maintenance
The Zehnder Thermostat is designed for long-term, reliable operation with minimal maintenance.
- Cleaning: Wipe the thermostat head with a soft, damp cloth. Do not use abrasive cleaners or solvents, as these can damage the surface.
- Function Check: Periodically check that the dial turns smoothly and that the temperature changes in the room correspond to the settings.
- Valve Pin Movement: If a radiator remains cold even when the thermostat is set to a high temperature, the valve pin might be stuck. Gently press the pin on the radiator valve (after removing the thermostat head) to ensure it moves freely.
7. Troubleshooting
If you encounter issues with your Zehnder Thermostat, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Radiator remains cold | Thermostat set too low or in zero position; valve pin stuck; air in radiator. | Increase temperature setting; check if valve pin moves freely; bleed the radiator. |
| Room is too hot | Thermostat set too high; thermostat sensing incorrect room temperature (e.g., near a heat source). | Decrease temperature setting; ensure thermostat is not obstructed or near other heat sources. |
| Difficulty turning the dial | Internal mechanism obstruction or damage. | Do not force the dial. If it's stiff, check for external obstructions. If the issue persists, contact support. |
| Water leakage around the valve | Loose connection or damaged valve. | Tighten the union nut (do not overtighten). If leakage continues, contact a qualified plumber. |
8. Specifications
- Brand: Zehnder
- Model Number: 819080
- Part Number: 819080
- Product Dimensions: 8 x 4.7 x 4.7 cm (L x W x H)
- Weight: 150 g
- Color: White
- Temperature Range: 7 to 28 degrees Celsius
- Sensor Type: Built-in liquid sensor
- Thread Connection: M 30 x 1.5
- Standard: Tested according to EN215
- Batteries Required: No
9. Warranty and Support
For warranty information and technical support, please refer to the official Zehnder website or contact your local Zehnder dealer. Keep your proof of purchase for any warranty claims.
