3. Calculate or measure the amount of external
static pressure.
- Add or deduct any additional static
resistance from Table 55.
4. Using the operating point determined from
Steps 1, 2, and 3, locate this point on the
appropriate supply air blower performance
table. (Linear interpolation may be necessary.)
5. Noting the RPM and BHP from Step 4, locate
the appropriate motor and, or drive.
6. Review the BHP compared to the motor
options available. Select the appropriate
motor and, or drive.
7. Review the RPM range for the motor options
available. Select the appropriate drive if
multiple drives are available for the chosen
motor.
8. Determine turns open to obtain the desired
operation point.
Example
1. 3400 CFM
2. 1.6 iwg
3. Using the airflow performance table below,
the following data point was located: 1039
RPM and 2.52 BHP.
4. Using the RPM selection table below, Model
ZY and Size 08 (Tons) 7.5 is found.
5. 2.59 BHP exceeds the maximum continuous
BHP rating of the 1.5 HP motor. The 3 HP
motor is required.
6. 1039 RPM is within the range of the 3 HP
drives.
7. Using the 3 HP motor and drive, 1.5 turns
open will achieve 1039 RPM.
INSTALLATION MANUAL ZY SERIES 3-10ton 60 Hertz R-410A84
Johnson Controls Ducted Systems
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