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Nominal capacity in Heating Coil

I input nominal capacity in a water heating coil definition of a AHU. I input Rated inlet/outlet water temperature and Rated inlet/outlet air temperature, too.

In a AHU sizing i input the Design supply air flow rate.

The results show that nominal capacity of the water heating coil is greater than nominal capacity specified.

Why does this happen?

How can i to fix the nominal capacity of the water heating coil?