9
Blower Performance Chart—Variable Speed Motor
The versatility of the variable speed motor enables the air handler
to tailor its performance to the different modes of operation
encountered in heating and cooling. All variable speed air
handlers are capable of operation at more than one nominal
airflow rate.The operation of a variable speed air handler blower
at different airflow rates is determined by the control board taps
and the thermostat. See the Blower Performance Chart—Variable
Speed Motor.
Before beginning the setup, become familiar with the information
found in the Blower Performance Chart—Variable Speed Motor.
The data in the Blower Performance Chart—Variable Speed
Motor is categorized by model size and mode of operation. Use
the information provided to determine the CFM taps needed for
cooling and heating.
Blower Performance Chart—Variable Speed Motor
CFM @ E.S.P. - inches W.C.
Air Handler
Model
Energized Thermostat
Terminal
Control
Board Tap
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
WMB36VB-1A
Y1
A
852
858
859
872
879
879
879
879
B
707
724
728
741
741
745
733
733
C
617
603
598
603
608
603
D
497
482
473
470
455
452
437
423
Y1/Y2
A
1,215
1,215
1,208
1,208
1,209
1,209
1,202
1,202
B
995
1,012
1,035
1,035
1,036
1,036
1,036
1,020
C
817
817
827
827
836
837
837
837
D
652
638
643
648
648
657
657
644
G
A
637
623
637
637
637
637
628
628
B
572
556
556
551
562
545
523
517
C
514
502
490
484
465
458
437
426
D
466
445
437
412
403
392
386
382
WMB48VB-1A
Y1
A
1,134
1,123
1,123
1,113
1,102
1,091
1,079
1,074
B
991
972
956
949
937
923
909
909
C
847
826
807
793
778
753
736
712
D
687
664
646
619
612
581
557
531
Y1/Y2
A
1,676
1,656
1,635
1,624
1,613
1,608
1,608
1,598
B
1,435
1,404
1,398
1,398
1,392
1,380
1,375
1,362
C
1,234
1,220
1,212
1,205
1,197
1,184
1,169
1,161
D
995
987
978
979
962
953
946
937
G
A
799
785
763
746
724
707
683
655
B
681
665
646
629
611
580
548
522
C
577
536
513
475
456
427
388
369
D
480
428
394
343
307
278
WMB60VB-1A
Y1
A
1,246
1,231
1,211
1,180
1,143
1,099
1,065
1,053
B
1,121
1,104
1,078
1,044
993
969
944
927
C
977
952
900
864
836
817
807
797
D
863
811
764
738
724
707
694
677
Y1/Y2
A
1,835
1,834
1,809
1,787
1,775
1,762
1,733
1,692
B
1,644
1,637
1,623
1,609
1,601
1,572
1,542
1,487
C
1,392
1,380
1,374
1,361
1,322
1,296
1,255
1,220
D
1,214
1,193
1,177
1,139
1,094
1,035
1,028
997
G
A
913
874
826
791
768
757
737
729
B
836
790
739
713
705
694
675
661
C
739
691
643
636
624
610
600
585
D
675
610
582
572
556
547
528
502
NOTES:
■
Humidistat will reduce cooling airflow by 10% in high humidity.
■
Adjust the Control Board Tap (+) will increase airflow by 10%, while the Control Board Tap (-) will decrease airflow by 12%.
■
Adjust the Control Board Tap (-) test will cause the motor to run at 70% of full airflow. Use this for troubleshooting only.
■
At the start of a call for cooling, there is a short run at 82% of airflow for 7.5 minutes.
■
At the end of a call for cooling, there is a blower delay of 1 minute.
Summary of Contents for WMB
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