aldes H/E95 - Balancing Airflow and Adjusting Motor Speed

Residential HRV/ERV
33
1. Record the pressure measurement.
2. Refer to the reference chart on the unit that shows the pressure readings versus the
corresponding supply airows. Record this airow.
3. Connect the tubing to the corresponding indoor air and exhaust air door ports using
the diagram above.
4. Repeat steps 6-8 for the exhaust airow.
5. Then follow the procedure in the following section.
Note: Generally, the best performance of the HRV/ERV is achieved when the airows are
within 10% of each other. The airow balance may be set for balanced airow, slightly
positive or slightly negative, depending on the particular needs of the home. Often a slight
positive pressure is desired to help resist backdraft from combustion devices, radon gas, or
drawing air from an attached garage.
Balancing Airow and Adjusting Motor Speed – FLEXControl User Interface
Once the airow is measured, with the tubes still connected, turn down the higher airow
to match the lower airow to achieve balanced airow. This is done by adjusting the two
potentiometers on the HRV/ERV, one for Supply (FAN IN) and one for Exhaust (FAN OUT). To
balance airow, follow steps 1-5 below. To adjust the motor speed, activate the unit on HIGH
SPEED by using the activation button, then follow the same steps 1-5 below.
Note: It is generally preferable to perform the adjustment with the unit on HIGH SPEED. The
LOW SPEED is approximately 60% of the high speed. ZRT VentZone® must be balanced on
LOW SPEED. See page 35.
Detail of the potentiometers on the HRV/ERV