Air Flow Balancing - Broan 1001 ERV Installer Manual

9. Air Flow Balancing

B P
ALANCING ROCEDURE
1. Set the unit to high speed.
Make sure that the furnace blower is ON if the installation is in any way connected to the ductwork of the cold air return. If not, leave
furnace blower OFF. If the outside temperature is below 0°C / 32°F, make sure the unit is not running in defrost while balancing. (By
waiting 10 minutes after plugging the unit in, you are assured that the unit is not in a defrost cycle.)
2. Place the magnehelic gauge on a level surface and adjust it to zero.
3. Connect tubing from gauge to flow collar (or "Flow Measuring Station") in exhaust air stream at location A.
Be sure to connect the tubes to their appropriate high/low fittings. If the gauge drops below zero, reverse the
tubing connections.
NOTE: It is suggested to start with the exhaust air flow reading because the exhaust has typically more
restriction than the fresh air, especially in cases of fully ducted installations and exhaust ducted
installation.
Place the magnehelic gauge upright and level. Record the readings.
4. Move tubing to FRESH air flow on the other side of the unit (location B) and note readings.
Adjust the fresh air balancing damper F until the reading at B is approximately the same as the reading
at A. If the reading at B is less than the reading at A, then go back and adjust the exhaust balancing
damper G to equal the fresh air flow.
5. Secure both dampers in place with tape or with a
fastening screw.
6. If you are using flow collars, remove them, reconnect the duct and seal with duct tape. If you are using "Flow Measuring Stations",
remove them and seal the holes with duct tape. Write the required air flow information on a label and stick it near the unit for future
reference (date, maximum speed air flows, your name, phone number and business address).
NOTES: Most flow collar kits provide a conversion chart located on the collar which enables you to convert magnehelic gauge
readings to equivalent cfm values.
The unit is considered balanced even if there is a difference of ±10 cfm (± 0.015 inch w.g.) between the two air flow readings.
If you are only using one flow collar or one "Flow Measuring Station", then, after completing the first reading, transfer this
measuring device to the other side of the unit and take the second reading.
(cont'd)
VD0069
24
F
VD0052
VP0003
VP0004
G