Specifications

267233-YIM-B-0507
38 Unitary Products Group
3. Use an Inclined Manometer or Magnehelic to determine
the pressure drop across the unit. This is the External
Static Pressure (ESP). In order to obtain an accurate
measurement, be certain that the air filters are clean.
4. Determine the number of turns the variable motor sheave
is open.
5. Select the correct blower performance table for the unit
from Tables 12 and 13. 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.
NOTE: With the addition of field installed accessories repeat
this procedure.
Figure 28: Dry Coil Delta P
Failure to properly adjust the total system air quantity
can result in extensive blower damage.
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500
Airflow (CFM)
Dry Coil Delta P (iwg)
XP078
XP090
XP102
XP120
XP150