Chilled ceilings are placed at the HVAC zone level. To place a chilled ceiling, navigate to the HVAC zone, click on the Add chilled ceiling tool and then, making sure that the cursor is inside the boundary of the required zone, left click with the mouse to place the chilled ceiling.
The chilled ceiling will be automatically positioned at the top of the zone:
Note: Where chilled ceilings are added to zones with internal ceilings, the floor surface of the associated adjacent upper zone must have a construction with an internal source to represent the embedded piping system of the chilled ceiling. Similarly, in the case of zones with external flat roofs, the roof construction must contain an internal source. Refer to the documentation on Constructions for further information on defining internal sources for constructions.