Sada AS25

Product detailed description

The AS25 sensor kit is used in residential and commercial heating systems that integrate solid fuel boilers with thermal storage tanks. Installers working with Atmos A25 or A45 burners often need to monitor and control boiler performance based on tank temperatures. This kit enables automatic control of the extraction fan in response to temperature changes in the storage tank, ensuring efficient combustion and heat transfer. It is typically installed in systems where the boiler is connected to a storage tank of 500 to 1000 L capacity, allowing for better modulation of burner activity and improved system efficiency.

Installers should be familiar with wiring diagrams and control logic for such systems. The setup involves mounting the sensors in the storage tank and connecting them to the control module, which interfaces with the boiler’s control unit. The system ensures that the extraction fan operates according to the temperature profile of the tank, helping to maintain stable and efficient boiler function. This is particularly important in systems using solid fuels such as wood pellets or logs, where precise temperature control can significantly affect performance and emissions.

Technical parameters

Installation and connection

The installation process begins with positioning the two KTF20 sensors inside the thermal storage tank. Each sensor has a 5 m cable, which allows for flexible placement and routing. The cables are then connected to the AD 02 control module, which acts as an interface between the sensors and the boiler’s control system. The special connector included in the kit ensures secure and reliable electrical connections.

During installation, it is important to verify that the sensors are placed at the correct depths within the tank to accurately reflect the temperature profile. Incorrect placement can lead to inaccurate readings and improper control of the extraction fan. The control module should be mounted in a dry and accessible location near the boiler. Installers should also check that all electrical connections are properly insulated and secured to prevent short circuits or signal interference. Common installation errors include using incorrect mounting positions for the sensors or neglecting to secure the cables properly, which can result in signal loss or mechanical damage over time.

Compatibility and accessories

The AS25 kit is specifically designed for use with Atmos A25 and A45 burners and boilers equipped with an extraction fan. For installations involving pellet-fired boilers without an extraction fan, the AD 02 module is not required, and only the two KTF20 sensors with 5 m cables are necessary to utilise the burner’s special functions. When ordering, installers should confirm the boiler configuration to determine whether the complete kit or just the sensor pair is needed.

Additional components such as the KTF20 sensors and the AD 02 module are available separately for custom configurations. It is important to ensure that all parts are correctly matched to the boiler model and system requirements to avoid compatibility issues. The kit is not compatible with non-Atmos boilers or burners that do not support temperature-based control functions.

Technical background for designers

The AS25 kit operates by using the KTF20 sensors to measure the temperature at specific points within the thermal storage tank. These sensors transmit signals to the AD 02 module, which processes the data and adjusts the operation of the extraction fan accordingly. This helps maintain optimal combustion conditions in the boiler by responding to the thermal load stored in the tank.

The sensors are made from durable materials suitable for long-term exposure to thermal fluctuations and moisture. Their design ensures accurate and stable temperature readings over time. Integration into the system requires careful planning to ensure that the sensors are positioned to capture representative temperature data. The control logic is based on predefined thresholds, which trigger the extraction fan to operate when the tank reaches certain temperature levels. This helps optimise the boiler’s efficiency and reduce unnecessary energy consumption.

Service and operation

Regular inspection of the sensors and their connections is recommended to ensure continued accuracy and reliability. Installers should check for signs of wear, corrosion or mechanical damage that could affect performance. The control module should also be inspected for any signs of overheating or electrical faults.

During routine maintenance, the sensors should be cleaned if necessary, and the integrity of the electrical connections should be verified. Any damaged components should be replaced immediately to prevent system failure. There are no specified service intervals provided in the documentation, but periodic checks are advisable to maintain system performance and safety.

Frequently asked questions

Can the AS25 kit be used with non-Atmos boilers?
No, the kit is specifically designed for use with Atmos A25 and A45 burners and boilers equipped with an extraction fan. It is not compatible with other brands or models.

Is the AD 02 module required for all installations?
No, the AD 02 module is only required when the boiler is equipped with an extraction fan. For boilers without a fan, only the two KTF20 sensors are needed.

How are the sensors positioned within the thermal storage tank?
The sensors should be placed at different depths within the tank to accurately reflect the temperature profile. Proper placement ensures reliable control of the extraction fan based on the tank’s thermal state.

What happens if the sensors are not properly connected?
If the sensors are not connected correctly, the control module will not receive accurate temperature data. This can lead to improper operation of the extraction fan and reduced boiler efficiency.