George’s CBAS Tips, January 2020

Computrols Building Automation Systems Low Voltage Blog

Controller Voltage

Did you know that Binary Outputs can be locked out if your power supply is inadequate? 

If the power being supplied to the controller is inadequate, all binary outputs will be locked in the OFF state until adequate power is returned. This way the controller continues to run, and if you have alarms setup, you will be notified that the equipment did not start. To know for sure whether this is Binary Lockout or your controller is defective, you must check Controller Diagnostics.

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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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