Installation manual

WHAT YOU NEED TO BALANCE THE UNIT

• A magnehelic gauge capable of measuring 0 to 0.5 inch of water

(0 to 125 Pa) and 2 plastic tubes.

• The balancing chart provided with the unit.

PRELIMINARY STAGE S TO BALANCE THE UNIT

• Seal all the unit 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 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 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

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.

Place the magnehelic gauge upright and level. Record equivalent

AIR FLOW of the reading according to the balancing chart on the

unit.

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 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: The air flows are acceptable up to a difference of ± 15% between the cfm home needs and the

intake or exhaust airflow, but the difference between both airflows must not exceed 10%.

Air Flow Balancing

VP0009

VP0010

VD0052

VD0051

Fresh air flow

Exhaust air flow