When modeling HRV or ERV systems, the software requires two ratings, taken from HVI (Heating and Ventilating Institute) Directory. The ASRE (Adjusted Sensible Heat Recovery) and the SRE (Sensible Heat Recovery) Ratings. The ASRE must be at least equal to the SRE rating.
At the Zone level of the Building Tree, in the Dwelling Units tab, check your inputs for these two ratings under the IAQ fan heading.
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