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It is the references list in each type of fan that determine if the fan is allowed in certain locations (e.g., branch or HVAC objects). The problem here is that the last 2 versions of E+ no longer read the idd at runtime and changing these characteristics of objects in the idd does not take effect unless the program is compiled (i.e., you will not be able to correct it by only changing the idd). Compiling the program will create a new Energy+.schema.epJSON file which is read during program execution. The plan is to eventually remove the idd file and use only JSON format.

Fan:SystemModel,
  A1 , \field Name
       \required-field
       \reference Fans
       \reference FansCV
       \reference FansCVandOnOff
       \reference FansCVandOnOffandVAV

Fan:ConstantVolume,
  A1 , \field Name
       \required-field
       \reference Fans
       \reference FansCV
       \reference FansCVandOnOff
       \reference FansCVandVAV
       \reference FansCVandOnOffandVAV
       \reference-class-name validBranchEquipmentTypes
       \reference validBranchEquipmentNames
       \reference-class-name validOASysEquipmentTypes
       \reference validOASysEquipmentNames