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17
For the Installer
8. BALANCING THE UNIT
PREPARATION
Follow these steps to ensure accurate measurements:
• Seal all the ductwork with tape. Close all windows and doors.
• Turn off all exhaust devices such as range hood, dryer and bathroom fans.
• Make sure the balancing dampers located on the Stale air to outdoors and Fresh air from outdoors ports are fully open.
• If the installation is in any way connected to the ductwork of the cold air return of a furnace/air handler, make sure that the furnace/
air handler blower is ON. If not, leave furnace/air handler 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.
• Set the unit to high speed.
BALANCING PROCEDURE
1. Place the magnehelic gauge on a level surface and adjust it to zero.
2. Connect tubing from gauge to EXHAUST airflow pressure taps (see diagram on unit door).
3. Be sure to connect the tubes to their appropriate high/low fittings. If the gauge drops below zero, reverse the tubing connections.
4. Note the CFM value from the balancing chart on the unit.
5. Repeat steps 3 and 4, but to the FRESH airflow pressure taps.
6. Using the balancing damper lever, lower the highest value so it matches the lowest value. A difference up to ±10cfm is acceptable.
7. Secure both dampers in place using their damper lever locking screw, and block all the pressure taps with the small plugs included
in the hardware kit.
CAUTION
• When loosening or tightening the damper lever locking screw, never use an electric screwdriver
or drill. Use a standard screwdriver.
• The stroke of the damper lever ends with a notch when the damper is in the completely open
position. Make sure that the damper lever is not set in that notch; this could cause the core
to freeze.
8. Write the required airflow 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).
VR0086
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