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Blower Performance
NF97U070M3B BLOWER PERFORMANCE (less filter)
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections
Increase (+15%) Heat CFM
Increase (+7.5%) Heat CFM
Default Heat CFM
Decrease (-7.5% ) Heat CFM
Decrease (-15% ) Heat CFM
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Increase (+10%) Cool CFM
Default Cool CFM
Decrease(-10%) Cool CFM
NF97U090M3C BLOWER PERFORMANCE (less filter)
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections
Increase (+15%) Heat CFM
Increase (+7.5%) Heat CFM
Default Heat CFM
Decrease (-7.5% ) Heat CFM
Decrease (-15% ) Heat CFM
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Increase (+10%) Cool CFM
Default Cool CFM
Decrease(-10%) Cool CFM
The effect of static pressure is included in air volumes shown.
The following control configurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance table):
Single stage thermostat:
- 40%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts firing rate based on first- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position
Continuous Fan speeds are approximately 38% of the same second-stage COOL speed position minimum 300 cfm
507028-05G / 31-5000694
40%
50%
538
636
496
588
453
539
419
498
385
458
First Stage Cool Speed- cfm
Medium
Low
Medium
Low
600
740
840
555
665
770
500
600
680
40%
50%
734
827
697
792
660
737
616
687
572
637
First Stage Cool Speed- cfm
Medium
Low
Medium
Low
625
710
830
565
670
760
520
610
685
Heating Input Range and Blower Volume - CFM
60%
70%
735
833
680
772
624
710
578
657
531
604
Blower Speed Selections
High
Low
(Default)
970
860
855
810
790
705
Heating Input Range and Blower Volume - CFM
60%
70%
821
1014
867
953
814
891
757
828
701
788
Blower Speed Selections
High
Low
(Default)
950
875
860
800
785
720
Issue 2128
80%
90%
931
1030
864
956
796
881
736
815
676
749
Second Stage Cool Speed-cfm
Medium
Medium
Low
1060
1215
960
1130
840
1005
80%
90%
1108
1201
1038
1123
968
1045
899
970
830
895
Second Stage Cool Speed-cfm
Medium
Medium
Low
1040
1210
945
1100
840
970
100%
1128
1048
967
895
822
High
(Default)
1365
1265
1140
100%
1295
1209
1122
1041
959
High
(Default)
1380
1240
1115
Page 39 of 66
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