5834853-YIM-B-0320
Johnson Controls Ducted Systems
39
Drive Selection
1.
Determine side or bottom supply duct Application.
2.
Determine desired airflow.
3.
Calculate or measure the amount of external static pressure.
• Add or deduct any additional static resistance from “Additional Static Resistance Table”.
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.
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: 1078 RPM & 2.66 BHP.
4.
Using the RPM selection table below, Model ZX 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.
1078 RPM is within the range of the 3 HP drives.
7.
Using the 3 HP motor and drive, 1/2 turns open will achieve 1078 RPM.
Airflow Performance
Example Supply Air Blower Performance
ZZ08 (7.5 Ton) Bottom Duct
CFM
Available External Static
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
2250
577
0.50
636
0.68
693
0.86
749
1.03
803
1.21
856
1.39
908
1.57
959
1.74
1009
1.91
1059
2.07
2400
591
0.59
650
0.77
707
0.95
763
1.13
817
1.31
870
1.48
922
1.66
973
1.83
1023
2.00
1073
2.17
2600
611
0.73
670
0.91
727
1.09
782
1.27
836
1.44
889
1.62
941
1.80
992
1.97
1043
2.14
1092
2.31
2800
631
0.88
690
1.06
747
1.24
803
1.42
857
1.60
910
1.77
962
1.95
1013
2.12
1063
2.29
--
--
3000
653
1.05
711
1.23
768
1.41
824
1.59
878
1.76
931
1.94
983
2.12
1034
2.29
1084
2.46
--
--
3200
675
1.23
733
1.41
790
1.59
846
1.77
900
1.94
953
2.12
1005
2.30
1056
2.47
1100
2.64
--
--
3400
673
1.35
740
1.54
802
1.73
859
1.91
913
2.10
964
2.28
1014
2.46
1064
2.64
--
--
--
--
Standard Static Option with Motor rated at 2.4-hp
Medium Static Option with Motor rated at 2.9-hp
High Static Option with Motor rated at 3.7-hp
--
Exceeds recommended Blower speed
Example RPM Selection
Model
Size
(Tons)
Airflow
Option
Phase
Max
BHP
Blower
Sheave
Motor
Sheave
6 Turns
Open
5 Turns
Open
4 Turns
Open
3 Turns
Open
2 Turns
Open
1 Turns
Open
Fully
Closed
ZZ
08
(7.5)
Std.
3
2.4
AK74
1VL34
N/A
475
525
575
625
675
725
Med.
3
2.9
AK74
1VL44
N/A
700
750
800
850
900
950
H. Static
3
3.7
AK74
1VP50
N/A
850
900
950
1000
1050
1100
Example Additional Static Resistance
Model
Size
(Tons)
CFM
Cooling
Only
Economizer
2” Filter
Electric Heat kW
6/6.5
10.5/11
14/15
16/16.5
24.8/27.8
ZZ
08 (7.5),
09 (8.5),
12 (10.0),
14 (12.5)
2200
0.04
0.18
0.10
---
---
---
0.07
0.09
2600
0.06
0.24
0.13
---
---
---
0.09
0.11
3000
0.10
0.35
0.16
---
---
---
0.12
0.14
3400
0.13
0.47
0.19
---
---
---
0.15
0.18
3800
0.16
0.59
0.22
---
---
---
0.19
0.22
4000
0.17
0.66
0.24
---
---
---
0.21
0.24
4400
0.20
0.79
0.27
---
---
---
0.25
0.29
4800
0.22
0.91
0.31
---
---
---
0.30
0.34
5200
0.24
1.04
0.35
---
---
---
0.35
0.39
5600
0.26
1.17
0.39
---
---
---
0.41
0.45
6000
0.28
1.30
0.43
---
---
---
0.48
0.52
Содержание ZZ Series
Страница 10: ...5834853 YIM B 0320 10 Johnson Controls Ducted Systems Figure 10 ZZE07 08 Unit Dimension...
Страница 11: ...5834853 YIM B 0320 Johnson Controls Ducted Systems 11 Figure 11 ZZ09 12 Unit Dimensions...
Страница 12: ...5834853 YIM B 0320 12 Johnson Controls Ducted Systems Figure 12 ZZ14 Unit Dimensions...
