Johnson Controls ZE Series Installation Manual page 44

6021974-UIM-A-1120
Drive Selection
1. Determine side or bottom supply air duct application.
2. Determine desired airflow.
3. Calculate or measure the amount of external static pressure.
4. Using the operating point determined from steps 1, 2 & 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 on the RPM selection table.
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. 2200 CFM
2. 1.6 iwg
3. Using the supply air blower performance table below, the following data point was located: 1478 RPM & 1.82 BHP.
4. Using the RPM selection table below, Size X and Model Y is found.
5. 1.82 BHP exceeds the maximum continuous BHP rating of the 1.5 HP motor. The 2 HP motor is required.
6. 1478 RPM is within the range of the 2 HP drive.
7. Using the 2 HP motor and drive, 2.5 turns open will achieve 1478 RPM.
Example Supply Air Blower Performance
Air Flow
0.2
(CFM)
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Field Supplied
Drive
2000 907 1.00 990
2200 960 1.24 1043
2400 1015 1.51 1099
2600 1074 1.83 1157
Table X: RPM Selection
Size
Model HP
(Tons)
1.5
X Y
2
If return static reaches -0.2" static, unit could experience
a degradation in airflow performance.
44
Available External Static Pressure - IWG
0.4 0.6 0.8
Standard Drive Option
1.07 1070 1.15 1146
1.31 1123 1.39 1199
1.59 1178 1.66 1255
1.90 1237 1.98 1314
Max Motor Blower
BHP Sheave Sheave
1.73 1VL44 AK56
2.3 1VP56 AK56
1.0 1.2
1.23 1220 1.31 1291 1.40
1.47 1273 1.55 1344 1.64
1.74 1329 1.83 1400 1.92
2.06 1387 2.14 1458 2.23
5 Turns 4 Turns 3 Turns
Open Open
930 995
1325 1395
1.4 1.6
HIgh Static Drive Option
1359 1.49 1425 1.58
1412 1.73 1478 1.82
1468 2.01 1534 2.10
- - - -
2 Turns 1 Turn
Open Open Open
1060 1130 1195
1460 1525 1590
Johnson Controls Ducted Systems
1.8 2.0
1488 1.68 1550 1.77
1541 1.92 1602 2.01
1597 2.19 1658 2.29
- - - -
Fully
Closed
1260
1660