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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.
Blower Performance Chart—Variable Speed Motor
Air Handler
Energized Thermostat
Model
Terminal
WMB36VB-1A
Y1
Y1/Y2
G
WMB48VB-1A
Y1
Y1/Y2
G
WMB60VB-1A
Y1
Y1/Y2
G
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.
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.
CFM @ E.S.P. - inches W.C.
Control
Board Tap
0.1
0.2
A
852
858
B
707
724
C
617
603
D
497
482
A
1,215
1,215
B
995
1,012
C
817
817
D
652
638
A
637
623
B
572
556
C
514
502
D
466
445
A
1,134
1,123
B
991
972
C
847
826
D
687
664
A
1,676
1,656
B
1,435
1,404
C
1,234
1,220
D
995
987
A
799
785
B
681
665
C
577
536
D
480
428
A
1,246
1,231
B
1,121
1,104
C
977
952
D
863
811
A
1,835
1,834
B
1,644
1,637
C
1,392
1,380
D
1,214
1,193
A
913
874
B
836
790
C
739
691
D
675
610
0.3
0.4
0.5
0.6
859
872
879
879
728
741
741
745
598
603
608
603
473
470
455
452
1,208
1,208
1,209
1,209
1,035
1,035
1,036
1,036
827
827
836
837
643
648
648
657
637
637
637
637
556
551
562
545
490
484
465
458
437
412
403
392
1,123
1,113
1,102
1,091
956
949
937
923
807
793
778
753
646
619
612
581
1,635
1,624
1,613
1,608
1,398
1,398
1,392
1,380
1,212
1,205
1,197
1,184
978
979
962
953
763
746
724
707
646
629
611
580
513
475
456
427
394
343
307
278
1,211
1,180
1,143
1,099
1,078
1,044
993
969
900
864
836
817
764
738
724
707
1,809
1,787
1,775
1,762
1,623
1,609
1,601
1,572
1,374
1,361
1,322
1,296
1,177
1,139
1,094
1,035
826
791
768
757
739
713
705
694
643
636
624
610
582
572
556
547
0.7
0.8
879
879
733
733
437
423
1,202
1,202
1,036
1,020
837
837
657
644
628
628
523
517
437
426
386
382
1,079
1,074
909
909
736
712
557
531
1,608
1,598
1,375
1,362
1,169
1,161
946
937
683
655
548
522
388
369
1,065
1,053
944
927
807
797
694
677
1,733
1,692
1,542
1,487
1,255
1,220
1,028
997
737
729
675
661
600
585
528
502
9
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