I understand about the network dependancy. However, you could generate some defaults fairly easily I think.
This relies on the communication with the VFD and the controller. I don't think the equation is overly difficult to start... what I mean is that you take in all the pertainent variables. However, looking at Hartman I see he has RPM 100% = 1 and I don't know where he gets his factors...
In the equation Hartman uses for Valve position you have
FC1CCVnew = FC1CCV + ( C2 / ( 1.0 + C1 x (PumpRPM - 0.3 ))) x (FC1DAT – FC1DATSP) x (C3 + FC1CCV )
Anyway, the majority of the equation has to cancel itself out leaving just a percentage. Seems like there is a BTUH equation in there somewhere.