Adding Electric Radiant supplemental Heat to a Multifamily with Packaged FAF

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I have a multifamily building with packaged FAF serving the apartment zones. The apartments also include radiant floor heating as supplemental heating (separate thermostat).

I am using EnergyPlus. I added the HVACTemplate:Thermostat, HVACTemplate:Zone:Unitary, and HVACTemplate:System:Unitary to model the package units. Adding the ZoneHVAC:LowTemperatureRadiant:Electric gives me: * Severe * GetZoneEquipmentData1: Number of Controlled Zone objects [83] greater than Number of Zones [45] * Fatal * GetZoneEquipmentData1: Too many ZoneHVAC:EquipmentConnections objects.

I recognize each zone can only have one thermostat, so I want to add both pieces of equipment to ZoneHVAC:EquipmentList, but I can't select the Unitary system and add it in order to prioritize.

What is the proper way to add these systems into the same zone?

Thanks for any help.

Kevin