The IR33W7HR20 is a model from Carel's IR33 series of universal electronic controllers
The IR33W7HR20 is a model from Carel's IR33 series of universal electronic controllers, designed primarily for temperature control applications in HVAC and refrigeration systems.
Key Features
Sensor Compatibility: Supports NTC, PTC, and Pt1000 sensors for flexible temperature input options
Power Supply: Operates on 115–230 VAC, making it adaptable to various electrical setups
Outputs: Includes 2 relay outputs and 1 digital output for controlling devices
User Interface: Features a clear LED display and large control buttons for easy operation
Auto-Tuning: Built-in PID auto-tuning helps optimize performance based on system conditions
Real-Time Clock (RTC): Enables accurate time-based control and alarm logging, even during power outages
Additional Functions: Integrated horn and IR sensor for audible alerts and remote control
