The proposed system includes an ERV serving two packaged rooftop units. In the proposed, I’d like to eliminate the heating in the rooftop unit planned for morning warm-up operation but keep the heating coil in the baseline.

Is the heating coil in the proposed packaged rooftop unit used for morning warm-up considered a preheat coil and therefore required to follow G3.1.2.3 Preheat Coils?

TRACE700 schematics identify the preheat coil in the system level to be located in the mixed air stream. I define a preheat coil as one located for outdoor air tempering only, in the pre-mixed air stream.

Any guidance is greatly appreciated. - Rock