ERV/HRV installations using forced-air space heating ducts
I am a HERS rater and EE building consultant. 40-50% of the new constructon I see utilizes an ERV/HRV for whole house ventilation. Of those, (roughly) half of those are installed in houses using ductwork for space heating and/or cooling. Of those many have the ERV/HRV houseside ports ducted into the return side of the duct. My question is: How reliable is the airflow strength of the ERV/HRV when the ERV is called to run, but the air handler unit fan is not running. (The call for heating / cooling and balanced ventilation is not always simultaneous) I’m reading footnote 15 of the ESTAR HVAC contractors checklist and thinking a Smart Cycler control (or equivalent) is required which will engage the air handler fan whenever the HRV is called. Will the Smart Cycler work in reverse and engage the HRV whenever the house calls for heating or cooling? Any feedback out there on the Smart Cycler or like control devices, Thanks for all your help.
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