Installation Guide

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7. BALANCING THE UNIT
7.1 WHAT YOU NEED TO BALANCE THE UNIT
• One VT9W main wall control close to 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 of the unit.
7.2 PRELIMINARY STAGES 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 all filters are clean (if it is not the first time the unit is balanced).
NOTE: Make sure that the furnace/air handler blower is ON if the installation is in any way connected to the ductwork of the cold air
return. If not, leave furnace/air handler blower OFF.
7.3 USING MAGNEHELIC GAUGES
VP0009
HIGH
LOW
FRESH AIR FLOW
HIGH
LOW
STALE AIR FLOW
VP0027A
1. Place the magnehelic gauge on a level surface and adjust it to zero.
2. According to the airflow to be measured, connect tubing from gauge
to STALE air flow or FRESH air flow pressure taps (see illustration at
right).
Be sure to connect the tubes to their appropriate high/low fittings. If
the gauge drops below zero, reverse the tubing connections.
7.4 BALANCING CHART AND PRESET SPEEDS TABLE
The unit balancing chart and the unit preset speed table are affixed on the unit, behind the
right panel (circled area on illustration at right).
VD0388