Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
First, make sure that all chillers are needed by either hard sizing the chillers or setting each chiller's sizing factor to 0.33 (so that each chiller will be sized for 33% of the peak load). If you leave the sizing factor at 1, each chiller will be sized to meet the total cooling load of the PlantLoop, and therefore only 1 chiller will ever be needed.
Second, make sure that the "Number of Pumps in Bank" field in the HeaderedPump object set to 3, based on the assumption that you want 1 pump per chiller.
Third, to get the chiller dispatch working the way you want, check out the Load Distribution Scheme field in the PlantLoop object. Based on your description, I think you want to set this field to "Optimal."
