Weather module BM-2 without external temperature sensor 8908294

Functional installation control integrated with the heat recovery system

This module serves as an intelligent control center for mechanical ventilation systems, combining the functions of a room temperature controller and a weather controller. Its primary task is the automatic management of devices from the CWL Excellent, CWL-2, and CWL-F-Excellent series, enabling precise adaptation of operating parameters to the current needs of users. A key feature of this model is the absence of a built-in outdoor temperature sensor – a solution that makes the device ideal for installations where atmospheric conditions are measured using a separate, external sensor or when control is based solely on indoor temperature and programmed schedules.

Thanks to the built-in timer, the user can freely manage not only heating (c.o.) but also domestic hot water preparation (c.w.u.). This means the system can automatically switch on and off the appropriate circuits at designated hours, resulting in real energy savings. Installers will appreciate the simplicity of installation and dedicated compatibility with the aforementioned heat recovery units, eliminating the need for additional converters or complex adapters.

Key benefits and practical application

The device has been designed to facilitate the daily operation of the ventilation and heating system. The black casing ensures the module aesthetically complements modern interiors, while its functionality extends beyond basic control.

• Schedule management: The ability to set individual operating profiles for c.o. and c.w.u., allowing, for example, temperature reduction at night or during the absence of household members without manual intervention.
• Sensor flexibility: The lack of a built-in outdoor sensor is not a limitation but a flexibility feature – the device operates within the system where an outdoor sensor is already installed or is not required by the project specifics.
• System compatibility: A dedicated solution for the CWL Excellent series and CWL-2 and CWL-F-Excellent models guarantees full communication integration without configuration errors.
• Thermal comfort regulation: As a room temperature controller, it responds to changes inside the building, maintaining the set heat level regardless of external conditions (provided they are monitored by another system component).

It is worth noting that this model (designated as BM-2) complements installations requiring advanced time-based control. It does not replace a full weather kit with its own sensor but works excellently as a module expanding the capabilities of the existing central unit. This allows for easy expansion of system functionality with c.w.u. operating schedules, which is often an overlooked element in simpler room controllers.

Construction features and operating principles

When designing the installation, one must remember the specifics of this model – it is a version without an outdoor temperature sensor. This means that if used as a weather controller in the full sense of the word (i.e., for a heating curve dependent on weather conditions), it will be necessary to connect an additional outdoor sensor to the appropriate input on the main unit or utilize data from another source. However, if the goal is merely time-based control of c.o. and c.w.u. and regulation of indoor temperature, the module operates independently as an advanced time thermostat.

The device has been designed specifically for cooperation with specific mechanical fan models: the CWL Excellent series ensures full integration of control functions, CWL-2 models are compatible even with newer device versions, and the CWL-F-Excellent line receives support for models equipped with additional filters or advanced air purification functions. Such dedication eliminates problems with communication protocol compatibility during installation.

For installers, this means fewer elements to mount on the wall, with no need to run additional lines from an outdoor sensor directly to the BM-2 module – if such a sensor is not required by the ventilation system designer. For the end user, this guarantees a simpler operating interface and easier configuration of heating device schedules.