507769-05G / 31-5000656
Page 46 of 55
Issue 2223
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.
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.
Blower Performance Data
NF96D045S3B Performance (Less Filter)
External
Static
Pressure
in. w.c.
Air Volume / Watts at Different Blower Speeds
High
Medium-High
Medium
Medium-Low
Low
cfm
watts
cfm
watts
cfm
watts
cfm
watts
cfm
watts
0.00
1455
370
1275
255
1175
190
920
90
865
85
0.10
1425
375
1250
260
1145
200
885
100
830
90
0.20
1395
380
1225
265
1115
210
850
110
795
95
0.30
1365
385
1195
275
1085
220
815
115
750
105
0.40
1325
385
1170
290
1045
230
770
130
700
110
0.50
1245
370
1130
300
1010
240
720
135
660
120
0.60
1180
360
1095
305
970
245
675
140
605
125
0.70
1100
330
1045
310
935
255
615
150
560
130
0.80
980
295
1000
290
895
260
580
155
505
135
NF96D070S4B Performance (Less Filter)
External
Static
Pressure
in. w.c.
Air Volume / Watts at Different Blower Speeds
High
Medium-High
Medium
Medium-Low
Low
cfm
watts
cfm
watts
cfm
watts
cfm
watts
cfm
watts
0.00
1720
510
1545
355
1340
235
1240
190
1020
95
0.10
1700
530
1505
360
1310
245
1195
200
955
110
0.20
1675
545
1465
370
1275
255
1155
205
895
115
0.30
1640
555
1420
380
1230
270
1120
215
835
125
0.40
1600
565
1380
395
1180
280
1060
225
785
135
0.50
1560
570
1340
400
1140
290
1015
235
715
145
0.60
1500
565
1300
420
1095
305
965
245
640
150
0.70
1405
540
1255
430
1040
315
910
255
585
160
0.80
1325
515
1215
445
990
320
865
265
525
170
NOTE
: All air data is measured external to unit without filter (not furnished - field provided)