Type of power supply: models are available for mains power supply (115 to 230 Vac), or alternatively operating at 12 to 24 Vac-dc or 24 Vac-dc Types of outputs: relay, 0 to 10 Vdc, or control of external SSRs The type of probe is selected by configuration parameter. The following sensors can be connected to the 'Multi-in' models: The following sensors can be connected to the 'temperature only' models: The models are divided into two families: the first with temperature only inputs, and consequently suitable for temperature control in HVAC/R and/or generic applications that require a thermostat in the range –50T150 ☌ the second with universal inputs (NTC, NTC-HT, PTC, PT1000, PT100, TC J/K, voltage and current). The range includes models for satisfying all requirements:

General characteristics The infrared Universale series is a range of instruments for controlling the temperature, pressure and humidity values in air-conditioning, refrigeration and heating units.

These controllers are designed especially for the management of refrigeration units, with characteristics that make them ideal for use in all types of applications. The ir33 for refrigeration is made up of electronic microprocessor controllers with green LED display and graphic symbols to assist the user. Most of the models are fitted with a 16A (3/4 Hp) relay for controlling the compressor. The operating logic follows the same lines, and the appearance reflects a number of the same characteristics, however the functions have been enhanced: the changeover from the previous range to the new version is thus simple and beneficial. The 12Vac and 12/24Vac/dc models represent the evolution of the ir32 series and are designed, due to their similarity, to be their natural replacement. For manufacturers CAREL offers the 230Vac version: more compact than the other versions, with a more essential configuration and consequently more competitive in terms of price. One particularly innovative version is the 115/230Vac model with built-in switching power supply, 4 relays and clock, all in the same size as the current ir32 range. The four base versions (12Vac, 12/24Vac/dc, 230Vac and 115/230Vac) give rise to a vast range of products in different configurations. Ir33 represents the maximum that CAREL technology has to offer in the field of applications for refrigeration.

Ir33 carel manual