Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
2026/1 Update, I was still not correct, the problem still exists, we just decided to re-build the model in another software.
(2025/12 original)
Well, I have fixed my own problem. in IES, attributes defining ventilation and space criteria are held in a component called Apache, were the details of controls for HVAC and meeting those criteria are defined in Apache-HVAC. The link between these two, where zone attributes are literally linked to the system, can break without clear indicator that it is broken. This can cause errors such as these where some zones remain consistent, following their ventilation criteria and schedules while others deviate. I would call this a bug yet I do not know if and how IES could fix it. I do know it has the net result of wasting incredible amounts of time trying to figure it out.
