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Blower Speeds
Follow the steps below to change the blower speeds.
1. Turn off electrical power to furnace.
2.
Remove blower compartment access panel.
3.
Disconnect existing speed tap at control board speed
terminal.
NOTE: Termination of any unused motor leads must
be insulated.
4.
Place unused blower speed tap on integrated control
"PARK" terminal or insulate.
5.
Refer to blower speed selection chart on unit wiring
diagram for desired heating or cooling speed. See
Blower performance data beginning on the next page.
See Table 21 for allowable heating speeds.
Blower Performance Data
NF96D045S3B Performance (Less Filter)
External
Static
High
Pressure
cfm
in. w.c.
0.00
1455
0.10
1425
0.20
1395
0.30
1365
0.40
1325
0.50
1245
0.60
1180
0.70
1100
0.80
980
NF96D070S4B Performance (Less Filter)
External
Static
High
Pressure
cfm
in. w.c.
0.00
1720
0.10
1700
0.20
1675
0.30
1640
0.40
1600
0.50
1560
0.60
1500
0.70
1405
0.80
1325
NOTE: All air data is measured external to unit without filter (not furnished - field provided)
Page 46 of 55
Air Volume / Watts at Different Blower Speeds
Medium-High
watts
cfm
watts
370
1275
255
375
1250
260
380
1225
265
385
1195
275
385
1170
290
370
1130
300
360
1095
305
330
1045
310
295
1000
290
Air Volume / Watts at Different Blower Speeds
Medium-High
watts
cfm
watts
510
1545
355
530
1505
360
545
1465
370
555
1420
380
565
1380
395
570
1340
400
565
1300
420
540
1255
430
515
1215
445
6.
Connect selected speed tap at control board speed
terminal.
7.
Re-secure blower access panel.
8.
Turn on electrical power to furnace.
9.
Recheck temperature rise.
Electronic Ignition
The integrated control has an added feature of an internal
soft lockout control. The feature serves as an automatic
reset device for integrated control lockout caused by
ignition failure. This type of lockout is usually due to low
gas line pressure. After one hour of continuous thermostat
demand for heat, a soft lockout will break and remake
thermostat demand to the furnace and automatically reset
the integrated control to begin the ignition sequence.
Medium
cfm
watts
1175
190
1145
200
1115
210
1085
220
1045
230
1010
240
970
245
935
255
895
260
Medium
cfm
watts
1340
235
1310
245
1275
255
1230
270
1180
280
1140
290
1095
305
1040
315
990
320
Issue 2223
Medium-Low
cfm
watts
cfm
920
90
865
885
100
830
850
110
795
815
115
750
770
130
700
720
135
660
675
140
605
615
150
560
580
155
505
Medium-Low
cfm
watts
cfm
1240
190
1020
1195
200
955
1155
205
895
1120
215
835
1060
225
785
1015
235
715
965
245
640
910
255
585
865
265
525
507769-05G / 31-5000656
Low
watts
85
90
95
105
110
120
125
130
135
Low
watts
95
110
115
125
135
145
150
160
170
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