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Maximum performance and reliability for scientific applications

Pharmaceuticals and healthcare services have continued to attract a high level of interest in recent years, with a big boost due to Covid19. Attention has also grown in product storage solutions...

DC Technology for high efficiency solutions

Energy efficiency has been a consolidated requirement for years now, especially in commercial refrigeration. The main driver is the normative context (in Europe through the Eco...

Increase efficiency...with in-field commissioning

From a refrigeration installer’s point of view, one of the critical aspects when working in the field to repair a faulty unit, for example, is time . Time matters, because we need to consider...

Monitoring services for performance optimisation

A fundamental role in ensuring control and optimisation of energy consumption remains sustainable over time is played by the digital systems used to support both occupants and maintenance...

The cutting edge in refrigeration controller performance

The events that have defined the last two years in our society, firstly the pandemic and subsequently the rise in inflation, have brought changes to many aspects of people’s everyday lives. ...

Advanced connectivity for refrigeration plants

Configuration and start-up from the screen of your smartphone There are numerous challenges behind the design and construction of a refrigeration machine, and every OEM knows them very well:...
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ir33 represents the basic selection offered by CAREL for applications in refrigeration.
A complete set of controls, from the single-relay version for static refrigerated units with normal temperature, with control only on the compressor, to the 4-relay version for ventilated, low temperature units, with compressor control, resistor or hot gas defrost, evaporation fans and multi-function auxiliary, available in several versions of power supply (12Vac, 12/24Vac, 115Vac, 230Vac and switching 15/230Vac).

Most of the models are equipped with a 16A relay for compressor control and an 8A relay for defrost control, evaporation fans and the auxiliary output. Some models are also available with a 2Hp compressor relay.

In addition to the common setting algorithms, ir33 has some additional features: "Direct" (cold) and "Reverse" (warm) operation with neutral zone, control of a second step regulated compressor, auxiliary evaporator control, condenser fan control, adjustment with supply and return probe with weighted average, display case/cell light control.
For control of the parameters, CAREL offers for free a simple configuration software, called Visual Parameter Manager (VPM), downloadable from:


EN 13485, air, S,A,1, -30°C +30°C
The ir33 series, equipped with standard CAREL NTC probe, meets the specifications of the EN 13485 standard (thermometers for measuring the air temperature for applications on storage and distribution units for chilled, frozen, deep-frozen/quick-frozen food and ice cream) set as mandatory for the storage of frozen and deep frozen food by the EC Regulation 37/2005 of January 12, 2005.