I am trying to model a DOAS FCU system that delivers condition OA from the DOAS to the FCU terminal unit before it is delivered to the zone. There is an AirTerminal:SingleDuct:InletSideMixer object in OS that I think would be the valid choice of air terminals for this system, however, when I assign both this object as well as the ZoneHVAC:FourPipeFanCoil object to the same zone I end up getting the error at the bottom of this post when trying to simulate the model. It appears that OS is not connecting the InletSideMixer to the ZoneHVAC system. I have tried arranging the equipment in the OS Thermal Zone tab with the AirTerminal object before the ZoneHVAC object and vice versa, both resulting in the same error. Am I modeling this system incorrectly, or is this an oversight with the OS software? I am running OS v2.1.
* Severe * IP: IDF line~1442 Error detected in Object=AIRTERMINAL:SINGLEDUCT:MIXER, name=INLET SIDE MIXER * ~~~ * Field [ZoneHVAC Unit Object Name] is required but was blank
*** IDF Context for following error/warning message:
*** Note -- lines truncated at 300 characters, if necessary...
*** 1439 AirTerminal:SingleDuct:Mixer,
*** indicated Name=Inlet Side Mixer *** Only last 6 lines before error line shown.....
*** 1440 Inlet Side Mixer, !- Name
*** 1441 , !- ZoneHVAC Unit Object Type
*** 1442 , !- ZoneHVAC Unit Object Name
*** 1443 Node 1, !- Mixer Outlet Node Name
*** 1444 Node 3, !- Mixer Primary Air Inlet Node Name
*** 1445 , !- Mixer Secondary Air Inlet Node Name * Severe * IP: IDF line~1445 Error detected in Object=AIRTERMINAL:SINGLEDUCT:MIXER, name=INLET SIDE MIXER * ~~~ * Field [Mixer Secondary Air Inlet Node Name] is required but was blank * Severe * IP: Blank "required" fields found in input * Severe * IP: Out of "range" values and/or blank required fields found in input * Fatal * IP: Errors occurred on processing IDF file. Preceding condition(s) cause termination.
