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Installation Instructions
6 Airflow Performance
Airflow performance data is based on cooling performance with a coil and no filter
in place. Check the performance table for appropriate unit size selection.
External static pressure should stay within the minimum and maximum limits
shown in the table below in order to ensure proper operation of both cooling,
heating, and electric heating operation.
MODEL
BLOWER
SIZE
SPEEDS
Tap(5)
Tap(4)
18
Tap(3)
Tap(2)-Factory
Tap(1)
Tap(5)
Tap(4)-Factory
24
Tap(3)
Tap(2)
Tap(1)
Tap(5)
Tap(4)
30
Tap(3)
Tap(2)-Factory
Tap(1)
Tap(5)
Tap(4)-Factory
36
Tap(3)
Tap(2)
Tap(1)
Table 7
Air Performance
Bold outlined areas represent airflow outside of the required 300-450 cfm/ton
range.
NOTES:
1.
Airflow based upon dry coil at 230V with no electric heat, no filter. For
24,30 and 36 sizes, airflow at 208V is approximately the same as 230V
because the multi-tap ECM motor is a constant torque motor. The torque
doesn't drop off at the speeds in which the motor operates.
2.
Airflow is equivalent for front or bottom return configurations.
3.
SCFM is nearly the same with cooling performance airflow, the gap is in the
1 to 2%.
14 |
0[0]
0.1[.02]
0.18[.04]
881
848
913
756
825
787
737
700
666
675
632
598
590
548
512
913
881
848
787
756
825
666
737
700
675
632
598
512
590
548
1362
1325
1280
1282
1242
1195
1225
1178
1267
1157
1111
1061
1077
1028
978
1362
1325
1280
1242
1195
1282
1267
1225
1178
1111
1061
1157
1077
1028
978
SCFM
EXTERNAL STATIC PRESSURE-Inches w.c.[kPa]
0.2[.05]
0.3[.07]
0.4[.10]
848
818
792
753
717
682
663
630
589
521
596
555
499
455
430
848
818
792
682
753
717
663
630
589
521
596
555
499
455
430
1266
1238
1197
1151
1176
1111
1143
1078
1120
971
1016
1052
965
932
886
1266
1238
1197
1176
1151
1111
1120
1078
1143
1052
1016
971
932
886
965
Bosch BWA Series Air Handler - BTC 761703105 A (03.2023)
0.5[.12]
0.6[.15]
0.7[.17]
763
731
691
650
617
580
511
474
550
480
440
399
368
338
309
691
763
731
650
617
580
474
550
511
480
440
399
368
338
309
1159
1119
1080
1028
975
1071
993
942
1036
929
884
842
804
768
850
1159
1119
1080
1071
1028
975
1036
993
942
884
842
929
850
804
768
0.8[.20]
650
540
436
366
263
650
540
436
366
263
1040
936
897
802
732
1040
936
897
802
732
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