Do not make the mistake of viewing SP1 as a "beta." It is a critical patch that resolved dangerous hardware writing bugs. However, always maintain a portable copy of 2.6.46 on a USB drive; in the world of HVAC field service, backward compatibility is your ultimate safety net. Last updated: October 2025. Specifications based on Carel S.p.A. release notes for versions 2.6.46 (Build date: March 12, 2021) and 2.6.57 SP1 (Build date: November 3, 2022).
In the world of HVAC/R (Heating, Ventilation, Air Conditioning, and Refrigeration), precision is not just a goal—it’s a necessity. For technicians and system integrators working with Carel controllers, the bridge between hardware and human interface is often software. Few tools are as critical as Carel 1tool , the proprietary service software used to configure, monitor, and troubleshoot Carel pCO series controllers. Carel 1tool 2.6.46 2.6.57 SP1