Nordyne 80+ AFUE *SA Installation Instructions Manual page 30

Heating
Model Motor
Input
Number Speed
(Btuh)
High*
Med-High
Med-Low**
Low
High*
Med-High
Med-Low**
Low
High*
Med-High
Med-Low**
Low
High*
Med-High
Med-Low**
Low
High*
Med-High
Med-Low**
Low
(†) "C" = Standard Models
"N" = 80% Low NOx
* Factory Set Cooling Speed
** Factory Set Heating Speed
Table 5. Maximum Airfl ow and Temperature Rises (°F) - Downfl ow Gas Furnaces
30
*SK - DOWNFLOW GAS FURNACES - 80% AFUE
0.1 0.2
CFM Rise CFM Rise CFM
1,375 29 1,340 30 1,300
1,155 35 1,130 35 1,110
790 51 775 52
650 62 640 63
1,610 33 1,590 34 1,575
1,295 41 1,275 42 1,260
1,155 46 1,135 47 1,115
910 59 885 60
1,675 40 1,655 40 1,640
1,330 50 1,315 51 1,300
1,180 56 1,165 57 1,150
940 71 925 72
2,395 33 2,335 34 2,285
2,190 37 2,135 37 2,115
1,785 45 1,770 45 1,740
1,145 70 1,110 72 1,070
2,445 38 2,395 39 2,385
2,195 43 2,170 43 2,140
1,795 52 1,780 52 1,770
1,480 63 1,475 63 1,450
1. Temperature rises in the table are approximate. Actual temperature rises may vary.
2. Temperature rises shaded gray are for reference only. These conditions are not recommended.
External Static Pressure (Inches Water Column)
0.3 0.4
Rise CFM Rise CFM
31 1,270 31 1,225
36 1,085 37 1,055
765 52 750 53 730
630 63 610 66 590
34 1,560 34 1,540
42 1,250 43 1,220
48 1,095 49 1,065
860 62 835 64 810
41 1,620 41 1,590
51 1,280 52 1,255
58 1,135 59 1,115
900 74 880 76 850
35 2,230 36 2,200
38 2,080 38 2,030
46 1,725 46 1,685
75 1,035 77 1,000
39 2,330 40 2,275
44 2,120 44 2,090
53 1,760 53 1,725
64 1,440 65 1,440
Notes
0.5 0.6 0.7
Rise CFM Rise CFM
33 1,175 34 1,115
38 1,015 39 975
55 700 57 665
68 565 71 530
35 1,495 36 1,460
44 1,195 45 1,170
50 1,040 51 1,015
66 785 68 765
42 1,560 43 1,520
53 1,230 54 1,200
60 1,090 61 1,060
78 825 81 795
36 2,140 37 2,080
39 1,975 41 1,915
47 1,645 49 1,615
80 950 84 905
41 2,225 42 2,130
45 2,030 46 1,975
54 1,690 55 1,655
65 1,415 66 1,405
0.8
Rise CFM Rise
36 1,035 39
41 910 44
60 610 66
75 480 83
37 1,415 38
46 1,120 48
53 980 54
70 735 73
44 1,475 45
56 1,150 58
63 1,010 66
84 760 88
38 2,000 40
42 1,810 44
50 1,565 51
88 835 96
44 2,015 46
47 1,855 50
56 1,610 58
66 1,375 68