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5835254-YIM-A-1119
Drive selection
1.
Determine side or bottom supply duct application.
2.
Determine the required airflow.
3.
Calculate or measure the amount of external static pressure.
4.
With 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.
Note the RPM and BHP from step 4 and 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 the turns open to obtain the required 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 and 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
36
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
Motor
Blower
Max BHP
sheave
sheave
1.73
1VM50
2.30
1VM50
1.0
1.2
Standard 1.5 HP and 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 and 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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