RenewAire SL70H Instruction Sheet

Airflow Balancing Instructions

Instruction Sheet: SL70H, SL70L

BALANCING

Balancing an airflow is done by setting the Outdoor Air fan speed and then adjusting the Return Air fan speed to
eject the same or somewhat less air to the outdoors.

Equipment required for testing airflows:

A magnehelic gauge (or manometer) or other device capable of measuring 0–1.0 in. w.g. of differential pressure.
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2 pieces of natural rubber latex tubing, 1/8" I.D., 1/16" wall thickness works best.
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Manometers are relatively inexpensive devices that are readily available from online retailers. Accuracy within
the range of 0–1.0 in. w.g. is the critical measure. Water manometers generally have graduations of 0.1" that are
difficult to accurately determine. For all manometers, there are two plastic tubes that connect at the manometer
and then the other ends go to pressure ports on the SL.
Individual differential static pressures (DP) are measured ACROSS the core, using the installed pressure ports
located on the removable door.
FIGURE 1.0 PRESSURE PORT LOCATIONS
USE THESE TWO PRESSURE PORTS TO
CHECK PRESSURE DROP FOR THE RA
AIR STREAM
USE THESE TWO PRESSURE PORTS TO
CHECK PRESSURE DROP FOR THE OA
AIR STREAM