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Model
Motor Speed
1
2
18
3
4
5
1
2
24
3
4
5
1
2
30
3
4
5
1
2
36
3
4
5
Table 6
Air performance without filter/electric heat - cased unit, bottom return
Bold outlined areas represent airflow outside of the required 300-450 cfm/ton
range.
NOTES:
1.
Airflow data is without filter or electric heat. Electric Heater adds 0.05 in.
static pressure.
2.
Use wet coil data for determining cooling airflow.
3.
Bottom louver panel adds 0.05 in. static pressure.
6.3 Required Airflow Range for Normal Operation
Model
Min
18
450
24
600
30
750
36
900
Table 7
Airflow range for normal operation
Bosch BCA Series Air Handler - BTC 761703106 A (03.2023)
SCFM without Filter or Electric Heat, Cased, Bottom Return
0[0]
0.1[.025]
0.15[.0375]
658
611
756
946
855
810
1035
965
926
1208
1110
1056
1225
1132
1079
756
658
611
855
810
946
1035
965
926
1208
1110
1056
1225
1132
1079
712
670
796
1012
901
850
1083
1044
1156
1310
1197
1150
1469
1328
1256
796
712
670
850
1012
901
1156
1083
1044
1310
1197
1150
1469
1328
1256
SCFM
Max
675
900
1125
1350
External Static Pressure-Inches W.C. [kPa]
0.2[.050]
0.3[.075]
566
480
675
766
883
788
999
874
1023
898
566
480
766
678
883
788
874
999
1023
898
626
537
709
801
1002
911
980
1101
1031
1182
626
537
801
709
1002
911
1101
980
1182
1031
Installation Instructions
0.4[.100]
0.5[.125]
0.55[.1375]
290
400
325
591
506
464
561
497
681
736
585
504
758
602
518
400
325
290
591
506
464
561
497
681
585
736
504
758
518
602
445
351
302
627
555
522
702
616
811
850
708
626
875
714
632
445
351
302
627
555
522
811
702
616
850
708
626
875
714
632
| 11
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