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1616
For the Installer
9. BALANCING THE UNIT
9.1 BeFoRe StaRting
What you need to balance the Unit:
• One X-Touch / Gold-Touch main wall control close to the unit.
• A magnehelic gauge capable of measuring 0 to 1 inch of water (0 to 250 Pa) and 2 plastic tubes.
• The balancing chart and preset speeds table of the unit; affixed on the unit, behind the small control panel.
Before balancing 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.
Installing the magnehelic gauge:
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).
3. Be sure to connect the tubes to their appropriate high/low fittings. If the gauge
drops below zero, reverse the tubing connections.
Balancing Chart and Preset Speeds Table
Use the balancing chart on the unit to convert pressure (in. w.g.) values read by the magnehelic gauge to airflow (CFM) values. While
balancing, the X-Touch/Gold-Touch wall control screen shows which pressure taps have to be used. Keep in mind that a difference
between flows up to ±10cfm is acceptable. See example below.
HIGH
LOW
FRESH AIR FLOW
HIGH
LOW
STALE AIR FLOW
VP0027A
Plug magnehelic gauge
tubing to STALE airflow.
Plug magnehelic gauge
tubing to FRESH airflow.
FLOW FRESH STALE
CFM in. W.g. in. W.g.
120 0.71 0.73
125 0.67 0.70
130 0.63 0.67
135 0.59 0.64
140 0.55 0.61
145 0.51 0.58
150 0.47 0.55
unit Balancing cHaRt
STALE reading value with
its corresponding CFM
FRESH reading value with
its corresponding CFM
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