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5565606-TIM-B-1018
Drive Selection
1.
Determine side or bottom supply 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.
2600 CFM
2.
1.6 iwg
3.
Using the supply air blower performance table below, the following data point was located: 1268 RPM & 1.95 BHP.
4.
Using the RPM selection table below, Size X and Model Y is found.
5.
1.95 BHP exceeds the maximum continuous BHP rating of the 1.5 HP motor. The 2 HP motor is required.
6.
1268 RPM is within the range of the 2 HP drives.
7.
Using the 2 HP motor and drive, .5 turns open will achieve 1268 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
1.5 HP & Field Supplied Drive
2200
804
0.50
866
2400
835
0.66
897
2600
869
0.84
931
2800
906
1.03
968
Table X: RPM Selection
Size
Model
HP
(Tons)
1.5
X
Y
2
44
Available External Static Pressure - IWG
0.4
0.6
0.8
0.71
925
0.90
982
0.87
956
1.06
1013
1.05
990
1.24
1047
1.25
1027
1.43
1084
Max
Motor
Blower
BHP
Sheave
Sheave
1.73
1VM50
2.30
1VM50
1.0
1.2
Standard 1.5 HP & Drive
1.06
1038
1.21
1092
1.35
1.22
1069
1.37
1124
1.51
1.40
1103
1.55
1158
1.69
1.60
1139
1.75
1194
1.89
6 Turns
5 Turns
Open
Open
AK74
N/A
897
AK64
N/A
1039
1.4
1.6
Alternate 2 HP & Drive
1147
1.48
1203
1.61
1259
1178
1.64
1234
1.77
1290
1212
1.82
1268
1.95
1324
1249
2.02
1304
2.14
1361
4 Turns
3 Turns
2 Turns
Open
Open
Open
945
991
1035
1094
1150
1207
Johnson Controls Ducted Systems
1.8
2.0
1.73
1317
1.87
1.90
1348
2.03
2.07
1382
2.21
2.27
-
-
1 Turn
Fully
Open
Closed
1079
1126
1256
1308
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