Introduction
The IR33 series represents the pinnacle of CAREL's refrigeration technology, offering a range of products in various configurations. The series includes four versions: 12 Vac, 12/24V ac/dc, 230 Vac, and 115/230 Vac, each designed to cater to different needs and applications.

Product Versions
The 115/230 Vac version is particularly innovative, featuring a switching power supply, four relays, and a clock within the same dimensions as the previous ir32 range. The 230 Vac version is more compact and cost-effective, targeting manufacturers. The 12 Vac and 12/24 Vac/dc models are designed as natural replacements for the ir32 series, maintaining similar operating logic and appearance but with upgraded functions.

Key Features

• Real-time clock for defrost and HACCP functions.
• Parameter download/read capability via a programming key.
• High-efficiency green LED display with icons.
• Compatibility with NTC or PTC probes by changing a parameter.
• Standard buzzer on all models.
• Switching power supply on 12/24 Vac/dc and 115/230 Vac models.
• Configurable digital inputs for NTC probe connection.
• Infrared option for remote control use.

Hardware and Software Characteristics
The IR33 series includes features such as pump-down management, automatic serial address assignment, keypad lock, and smart defrost with various modes. It also supports HACCP functions and allows configuration of the auxiliary relay as a second delayed compressor. The user interface and parameters are compatible with the ir32 range.

Options and Accessories

• Programming keys with battery or power supply.
• RS485 serial card.
• Remote control.
• NTC temperature probes with different ranges.

Conclusion
The IR33 series offers advanced technology and flexibility for refrigeration applications, making it a competitive choice for manufacturers and users seeking reliable and efficient solutions.