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The error is pretty self-explanatory. The curve is supposed to be normalized, that is produce a value of 1.0 at the rated conditions.

If you look at the I/O reference guide for this curve here, you'll see that this is a bivariate object as a function of indoor wet-bulb temperature and condenser temperature (either air dry-bulb temperature or water temperature if watercooled).

The engineering reference here also includes more info and the equations.

What the documentation is not clear about is what these rated temperatures are, so I'll tell you what they are for an Air-cooled VRF after looking at the source code:

  • RatedInletWetBulbTemp: 19.44 or 67F
  • RatedOutdoorAirTemp: 35 C or 95F

For heating side,

  • RatedInletWetBulbTempHeat: 15.55 or 60F
  • RatedOutdoorAirTemp: 8.33 C or 47F