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AirTerminal:SingleDuct:ConstantVolume:CooledBeam requires air inlet and outlet nodes even if you select Passive for Cooled Beam Type. If you want to supply fresh air with another AirLoop (CAV with Reheat), please set Supply Air Volumetric Flow Rate 0m3/s.

You can model multiple AirLoops serving a single thermal zone. So, one zone can have AirTerminal:SingleDuct:ConstantVolume:CooledBeam and AirTerminal:SingleDuct:ConstantVolume:Reheat. You should take care of how to input ZoneHVAC:EquipmentConnections. One zone has only one Zone Air Inlet Node or NodeList Name and one Zone Return Air Node or NodeList Name. You need to use NodeList.

Example:

ZoneHVAC:EquipmentConnections,
    Zone_1,       !- Zone Name
    Zone_1 Equipment,  !- Zone Conditioning Equipment List Name
    Zone_1 Supply Inlets,  !- Zone Air Inlet Node or NodeList Name
    ,                        !- Zone Air Exhaust Node or NodeList Name
    Zone_1 Zone Air Node,  !- Zone Air Node Name
    Zone_1 Return Outlets;  !- Zone Return Air Node or NodeList Name

NodeList,
    Zone_1 Supply Inlets,   !- Name
    Zone_1 CooledBeam Supply Inlet,  !- Node 1 Name
    Zone_1 CAV Supply Inlet;  !- Node 2 Name

NodeList,
    Zone_1 Return Outlets,   !- Name
    Zone_1 CooledBeam Return Outlet,  !- Node 1 Name
    Zone_1 CAV Return Outlet;  !- Node 2 Name