Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Yes you do need the AirloopHVAC:UnitarySystem object since this is the HVAC unit that has the coils and fan. If you are controlling using SetPoint then you will need SetpointManagers to control operation. You also need to use constant fan operating mode. Use SetpointManager:SingleZone:Cooling (Tstat in 1 zone) or SetpointManager:MultiZone:Cooling:Average (Tstat in all zones) and similar for heating. If your fan is draw through then you will also need SetpointManager:MixedAir to adjust the set point for each coil. When you use more than 1 set point manager AND you have a draw through fan, keep the cooling and heating set points separate. Set the cooling set point at the air loop outlet node and heating set point at the air loop inlet node. Then use the mixed air managers to reference each of those nodes and write to the coil outlet nodes. If you are NOT using a draw through fan you can write directly to the coil outlet nodes (since you don't have to adjust for fan heat).
