WHAT YOU NEED TO BALANCE THE UNIT
• A magnehelic gauge capable of measuring 0 to
0.5 inches in water (0 to 125 Pa) and 2 plastic tubes.
• The balancing chart of the unit.
PRELIMINARY STAGES TO BALANCING THE UNIT
• Seal all the unit ductwork with tape. Close all windows
and doors.
• Turn off all exhaust devices such as range hoods, dryers and
bathroom fans.
• Make sure the balancing dampers are fully open
.
• Make sure all filters are clean (if it is not the first time you balance the unit).
BALANCING PROCEDURE
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 EXHAUST air flow pressure
taps (see diagram). Be sure to connect the tubes to their
appropriate
high low
fitting. 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
and exhaust ducted installations.
Place the magnahelic gauge upright and level. Record equivalent AIR FLOW of the
reading according to the balancing chart.
4. Move tubing to FRESH air flow pressure taps (see diagram). Adjust the fresh air balancing
damper until the FRESH air flow is approximately the same as the EXHAUST air flow. If
Fresh air flow is less than EXHAUST air flow, then go back and adjust the exhaust
balancing damper to equal the FRESH air flow.
5. Secure both dampers in place with tape or with a fastening screw.
6. 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).
NOTE
• Use conversion chart provided with the unit to convert magnehelic gauge readings to
equivalent cfm values.
• The unit is considered balanced even if there is a difference of +/- 10 cfm or +/- 5 l/s
or +/-17 m
3
/h (+/- 0.015 inch in water) between the 2 air flows.
VP0010
fresh air flow
exhaust air flow
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