Question-and-Answer Resource for the Building Energy Modeling Community
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You would need to enter a value for Max OAT for supplemental heater. If OS does not allow entry for that field then you will need to edit the idf and manually insert a value for that field. The default value is 21 C so I assume that field exists in the idf file. Export the file and search for AirloopHVAC:UnitarySystem to see what is available for edit. If there is not 40 fields then comma's will need to be added so you can enter your data.
This is from the IDD file. You will edit the idf file. This field is numeric field 18, but it is field 40 (N18+A22) in the list of inputs.
AirLoopHVAC:UnitarySystem,
N18, \field Maximum Outdoor Dry-Bulb Temperature for Supplemental Heater Operation
\type real
\units C
\default 21.0
\note Enter the maximum outdoor dry-bulb temperature for supplemental heater operation.
A23, \field Outdoor Dry-Bulb Temperature Sensor Node Name
