Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Try to relax the value in the input field called Cooling Convergence Tolerance in the ZoneHVAC:WindowAirConditioner object. The value of 0.001 is sometimes too small.
Note that when there are multiple ZoneHVAC units in the same zone they are staged so that the second window AC will pick up the load remaining after the first unit tries to meet the zone's cooling load. They won't both run together at the same loading. Because both units are autosized here, it is likely that the first unit will be able to meet all the load and the second one is not going to do much. Modeling two units makes more sense if the sizes are fixed at input. Even if the zone really does have two units in the actual building, it is common to model as one larger unit.
