5120410-XIM-B-0216
Johnson Controls Unitary Products 43
4. Determine the number of turns the variable motor sheave
is open.
5. Select the correct blower performance table for the unit
from Tables 22 and 23. Tables are presented for side and
downflow configuration.
6. Determine the unit Measured CFM from the Blower
Performance Table, External Static Pressure and the
number of turns the variable motor sheave is open.
7. To adjust Measured CFM to Required CFM, see SUPPLY
AIR DRIVE ADJUSTMENT.
8. After reading has been obtained, remove the tubes and
seal holes.
9. Tighten blower pulley and motor sheave set screws after
any adjustments. Re-check set screws after 10-12 hrs. run
time is recommended.
NOTE: With the addition of field installed accessories repeat
this procedure.
Figure 27: Dry Coil Delta P 50” Cabinet
Failure to properly adjust the total system air quantity
can result in extensive blower damage.
DC 150
DC 120
Airflow (CFM)
Dry Coil Delta P (IWG)
PREDATOR
®
50” CABINET, 50 HZ UNITS
INDOOR COIL PRESSURE DROP VS AIRFLOW
1500
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000
To Next Page
Loading...
