5120410-XIM-B-0216Johnson Controls Unitary Products 434. Determine the number of turns the variable motor sheaveis open.5. Select the correct blower performance table for the unitfrom Tables 22 and 23. Tables are presented for side anddownflow configuration.6. Determine the unit Measured CFM from the BlowerPerformance Table, External Static Pressure and thenumber of turns the variable motor sheave is open.7. To adjust Measured CFM to Required CFM, see SUPPLYAIR DRIVE ADJUSTMENT.8. After reading has been obtained, remove the tubes andseal holes.9. Tighten blower pulley and motor sheave set screws afterany adjustments. Re-check set screws after 10-12 hrs. runtime is recommended.NOTE: With the addition of field installed accessories repeatthis procedure.Figure 27: Dry Coil Delta P 50” CabinetFailure to properly adjust the total system air quantitycan result in extensive blower damage.DC 150DC 120Airflow (CFM)Dry Coil Delta P (IWG)PREDATOR® 50” CABINET, 50 HZ UNITSINDOOR COIL PRESSURE DROP VS AIRFLOW150000.10.20.30.40.50.60.70.80.92000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000
