Category Archives: CBAS Tips

George’s CBAS Tips, July 2020

CBAS Tips, Products,

Formulas and Calculations Help Feature

Formulas and Calculations is a Help feature that can be found on the System Menu > Help.  In older versions of CBAS, this was found directly on the System Menu. Currently, there are 4 entries..

The first one is a duct area calculator for use in the Cubic Feet per Minute (CFM) Calculation on a VAV or UNI-B. The VAV-B has this built into its VAV-B Utility Program that is used when you initially set it up. All you have to know is the dimensions of the duct and whether it is round or rectangular. Just enter the size and a value for the area will appear. You can also use this value as the Duct Size on a VAV template for a UNI-B.

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George’s CBAS Tips, April 2020

CBAS Tips, Products,

What do the lights on the LX controller mean?

Most Computrols hardware products include various LEDs – these lights can be very helpful in providing visual feedback of various controller conditions and the status of communication channels.

The LX controller features several differences and improvements over the X-line with regards to LED indicator light functions.

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George’s CBAS Tips, March 2020

CBAS Tips, Products, ,

How to Program Software Points in CBAS

The easiest way to program Software Points is by going to Hardware View, finding the controller then going to Points. In Editor Mode or in Live Edit you will see a line at the bottom of the points that says Add A Software Point. Click that to add a point.

Note that all the standard Software Point types are there but there are also a few select System Point types. For example, Controller Run Minutes is a Point that counts the minutes that a controller has been running without a reboot. This can be helpful in determining if a controller’s power is being interrupted

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George’s CBAS Tips, February 2020

CBAS Tips, Products, ,

Add or Change Point Type

Did you know that you can now use 10K Type II temperature sensors in addition to 10K Type III in CBAS? This means that if Type II sensors are in place when retrofitting controllers at a site, you don’t have to change them.

The use of Type II is limited to the LX line of controllers. You must have a CBAS19 version and LX firmware dated January 15, 2020 or later for this to work.

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George’s CBAS Tips, January 2020

CBAS Tips, Products, ,
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

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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.

Continue reading George’s CBAS Tips, November 2019 →