This is a model for an air-to-water heat pump where the capacity
and input power are computed based on the equation fit method. The
model can be configured to represent either a non-reversible heat
pump (is_rev=false) or a reversible heat pump
(is_rev=true). This model uses Buildings.Fluid.HeatPumps.EquationFitReversible,
which the user may refer to for the modeling assumptions.
Refer to the documentation of the interface class Buildings.Templates.Components.Interfaces.PartialHeatPumpEquationFit for a description of the available control input and output variables.