Control unit stiebel eltron VLR 70-2 CU — controller set for 2 VLR 70 L Trend units

The control unit stiebel eltron VLR 70-2 CU — controller set for 2 VLR 70 L Trend units is a dedicated controller designed to manage and coordinate two VLR 70 L Trend ventilation or heat recovery units. It centralizes operation, synchronizes fan speeds and modes, and provides status monitoring to ensure consistent performance of paired devices in residential or light-commercial installations. The controller set supports simplified wiring and centralized adjustment of key operating parameters for the two connected units.

Advantages

The controller set enables synchronized control of two VLR 70 L Trend units, reducing the need to operate each unit separately and ensuring balanced airflow and heat recovery across connected spaces. Centralized monitoring and control simplify commissioning and routine maintenance by providing a single point of configuration. The design is intended to integrate with existing VLR 70 L Trend units, maintaining manufacturer-compatible control logic and preserving system functions such as mode selection and status indication.

Suitable for

• Paired ventilation systems in apartments or houses where two VLR 70 L Trend units serve adjacent zones
• Light-commercial spaces requiring coordinated heat recovery across two units
• Installations where centralized control and simplified maintenance of two units is preferred

Key specifications

• Controller type: centralized controller set for two VLR 70 L Trend units
• Functionality: synchronized operation, mode coordination and status monitoring of connected units
• Connectivity: dedicated interfaces compatible with VLR 70 L Trend unit controls (manufacturer-specific wiring)
• Installation: wall- or panel-mountable control unit intended for indoor electrical cabinets or service areas
• Operating environment: designed for typical residential and light-commercial HVAC installation conditions

How to use

Mount the control unit in an accessible indoor location near the paired VLR 70 L Trend units or their service access points. Connect each VLR 70 L Trend unit to the controller using the manufacturer-specified wiring and connectors, observing polarity and termination instructions supplied by the unit manufacturer. After electrical and control wiring is complete, power the system and use the controller interface to configure synchronized modes, fan speeds and monitoring parameters so both units operate in a coordinated manner. Verify status indicators and perform functional tests for airflow and heat recovery performance.

Usage recommendations

Use the control unit together with two VLR 70 L Trend units from the same manufacturer to ensure full compatibility. Follow installation and safety instructions provided by stiebel eltron and have a qualified technician perform electrical connections and initial configuration. Regularly check status indicators and perform scheduled maintenance on the connected ventilation units to preserve system performance.