York 251934-YTG-J-0910 User Manual
Page 66
251934-YTG-J-0910
66
Johnson Controls Unitary Products
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.
6800 CFM
2.
2.0 iwg
3.
Using the supply air blower performance table below, the following data point was located: 1020 RPM & 5.92 BHP.
4.
Using the RPM selection table below, Size X and Model Y is found.
5.
5.92 BHP exceeds the maximum continuous BHP rating of the 5.0 HP motor. The 7.5 HP motor is required.
6.
1020 RPM is within the range of the 7.5 HP drives.
7.
Using the 7.5 HP motor and drive, 3.5 turns open will achieve 1020 RPM.
Example Supply Air Blower Performance
Air Flow
(CFM)
Available External Static Pressure - IWG
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Standard
5 HP & Field
Supplied
Drive
Standard 5 HP & Drive
High Static 7.5 HP & Drive
6400
719
2.55
756
3.03
792
3.49
828
3.92
864
4.32
899
4.67
933
4.98
966
5.24
998
5.45 1028 5.59 1056 5.67 1083 5.68
6800
742
3.02
778
3.51
814
3.97
850
4.40
886
4.79
921
5.15
955
5.46
988
5.72 1020 5.92 1050 6.07 1078 6.15 1105 6.16
7200
765
3.54
802
4.03
838
4.49
874
4.92
910
5.32
945
5.67
979
5.98 1012 6.24 1044 6.44 1074 6.59 1102 6.67 1129 6.68
7600
790
4.11
827
4.60
863
5.06
899
5.49
935
5.88
970
6.24 1004 6.55 1037 6.81 1069 7.01 1099 7.16 1127 7.24 1154 7.25
7.5 HP & Field
Supplied Drive
Table X: RPM Selection
Size
(Tons)
Model
HP
Max
BHP
Motor
Sheave
Blower
Sheave
6 Turns
Open
5 Turns
Open
4 Turns
Open
3 Turns
Open
2 Turns
Open
1 Turn
Open
Fully
Closed
X
Y
5
5.75
1VP60
BK110
730
765
800
835
870
905
N/A
7.5
8.63
1VP60
BK090
905
950
990
1035
1075
1120
N/A