Siemens RLU222 – universal controller

The Siemens RLU222 is a universal controller designed for HVAC and building automation systems. It is used to control ventilation, heating and air conditioning equipment, ensuring stable temperature regulation and efficient system operation.

The controller supports multiple sensor inputs and control outputs, allowing integration with various HVAC components such as fans, valves and dampers. It is commonly used in commercial and industrial building automation systems.

Technical overview:
• Product type: universal HVAC controller
• Model: RLU222
• Application: ventilation, heating and air conditioning control
• Inputs: temperature and sensor inputs for HVAC systems
• Outputs: relay and control outputs for actuators and valves
• Power supply: typically 24 V AC
• Mounting: DIN rail installation
• Protection class: suitable for control cabinet installation
• Operating temperature: approx. 0°C to +50°C
• Designed for building automation systems

Typical applications:
• HVAC ventilation systems
• Heating and cooling control
• Air handling units (AHU)
• Commercial building automation
• Industrial facility climate control

About the manufacturer:
Siemens is a global leader in automation, building technologies and industrial control systems. The company develops controllers, automation platforms and energy management solutions used in buildings, infrastructure and industrial applications worldwide.