George’s CBAS Tips, November 2019

Using CO2 sensors with VAV-B

We were recently asked if it would be possible to utilize CO2 sensors with the VAV-B in order to control CFM setpoints. At this particular site, they want to add CO2 sensors to some of the VAV-Bs and command the CFM setpoint to the MAX CFM when CO2 gets above 800 ppm. In the VAV-B manual, there is a scenario that explains how to do this when the CO2 sensor is directly attached to the VAV-B. It is located at the end of the manual in Appendix B.

But what if you don’t have any available inputs on the VAV-B and your CO2 sensor is located on a different controller? In this case, the logic to make this happen will have to come from CBAS.

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October, A Busy Month at Computrols HQ

October was an active month at Computrols headquarters just outside of New Orleans, LA. We celebrated our 36-year anniversary and manufacturing month. We also hosted a group of our remote technicians for training, as well as our second annual Distribution Partner Summit.

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Where is the ROI in BAS?


As a property management professional, you are constantly looking to justify any and all investments you make for your facility. In many cases, this calculation is very simple.

Take for instance a Variable Frequency Drive (VFD). When you hook up a VFD to your facility’s HVAC equipment, you can put a meter on that piece of equipment to see how much energy it is consuming compared to how much it was consuming before.

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