How to add CO2 concentration in my OS?

Hi, I am using OS ver 2.6. Currently I am trying to add CO2 concnetration in my zones. I would like to measure CO2 concentration level (ppm). So I went to 'simulation settings' - 'Zone air contaminant balance' - 'Carbon dioxide concentration' - 'on' However I can not add 'Outdoor carbon dioxide schedule name' Please let me know how to add co2 concentration in my model. Best Maki

Hi, I encounter the same issue after having defined a dimensionless schedule with a constant value in OpenStudio. In the simulation settings, the "Outdoor Carbon Dioxide Schedule Name" selector is not populated with any schedule so I can't set anything there. Is there a workaround for this (beside using the "Inject IDF Objects" measure)?

I have filed a bug report here: https://github.com/openstudiocoalitio...