I just had an HRV installed, but I'm concerned that my installer did not balance it correctly. On the HRV there are ports on the bottom to use for balancing. The technician used a meter to make differential measurements on the stale air in vs out and the fresh air in vs out. He adjusted dampers to make sure the differential pressure readings were the same. I'm concerned because there is a table stuck to the bottom of the unit that shows that a given pressure reading corresponds to different CFM values, depending on whether the measurement is from stale air or fresh air. For example, a pressure reading of 0.22 corresponds to a fresh air CFM of 54 and a stale air CFM of 122.
Is he supposed to balance the differential pressure readings or should he use the table to convert the differential pressure readings to CFM to ensure that the stale and fresh air CFM values are equal?