48
J.3.2. Air Flow Measurements and Adjustments
• Measure the supply/ return static to get the unit static pressure by drilling out the simple locations shown in
Figure
J.3.2 - A.
• Take the measured static pressure and match to the static listed on the airflow table to find your CFM.
• Take the measured static pressure and match to the static listed on the airflow table to find your CFM.
Use the charts and guide provided in the Installation and Operation instructions provided with the unit to calculate the air
flow, against the measured static pressures and number of turns on the adjustable blower sheave. Verify the measured air
flow against the charts.
If adjustment is needed, turn off the power to the entire system, and adjust the adjustable blower sheave. To
do this, loosen the belt tension and remove the belt. Using an Allen wrench to loosen the set screw on the
end of the adjustable blower sheave, turn the blower sheave in until it is fully closed.
Using the charts determine the total number of turns needed on the sheave. Make those turns in half turn
increments, once set, align the set screw with the Flat section on the sheave threads. Tighten the set screw
to secure the sheave.
Reinstall the belt and tension properly and power on the system. Allow the thermostat to call for a fan, make
sure the VFD ramps the blower to 100% or 60hz.
Once the fan is at speed, measure the air flow and static pressure, compare against the charts. If additional
adjustment is needed repeat the adjustment procedure.
J. STARTUP AND OPERATION
Figure J.3.2. – A: Blower Assembly and Motor
Figure J.3.2. – B: Adjustable Blower Sheave
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