Blower Speed Adjustments - Lennox CB29M Installation Manual

Blower Speed Adjustments

Minimum Blower Speeds (With Electric Heaters)
For the minimum allowable speed for the CB29M/CB30M
series units with electric heat, refer to the ECB29 installa-
tion instructions.
Air Volume Adjustment
Blower speed selection is accomplished by changing the
taps at the harness connector at the blower motor. See fig-
ure 10. Refer to unit wiring diagram in figure 11. Refer to
Tables 3 through 20 for blower performance data.
External Static External Static
Pressure
in. w.g. Pa
.00 0
.05 10
.10 25
.15 35
.20 50
.25 60
.30 75
.40 100
.50 125
.60 150
.70 175
.75 185
NOTE − All air data is measured external to unit with air filter in place. Electric heaters have no appreciable air resistance.
External Static Pressure
in. w.g. Pa
.00 0
.05 10
.10 25
.15 35
.20 50
.25 60
.30 75
.40 100
.50 125
.60 150
.70 175
.75 185
NOTE − All air data is measured external to unit with air filter in place. Electric heaters have no appreciable air resistance.
504719M 09/05
CB29M-21/26 Blower Performance (208/230V)
Air Volume and Motor Watts at Specific Blower Taps
Low
cfm L/s Watts
700 330 245
690 325 240
680 320 235
665 315 230
655 310 225
640 300 220
625 295 220
595 280 210
555 260 195
510 240 185
395 185 165
- - - - - - - - - - - -
CB29M-31 Blower Performance (208/230V)
Low
cfm L/s
1015 480
995 470
980 465
960 455
945 445
925 435
900 425
860 405
800 380
740 350
670 315
610 290
Blower Speed Tap Selection
Press the tab to release wire connector.
select connector location for new speed.
Insert wire until it clicks.
Table 3
Medium
cfm L/s
895 420
875 415
865 410
850 400
830 390
810 385
795 375
750 355
700 330
640 300
- - - - - - - -
- - - - - - - -
Table 4
Air Volume and Motor Watts at Specific Blower Taps
Medium
Watts cfm L/s
385 1135 535
375 1120 530
365 1095 515
355 1075 505
345 1050 495
335 1025 485
325 1005 475
305 950 450
285 890 420
265 810 385
240 735 345
225 675 320
Page 10
connector
Figure 10
High
Watts cfm L/s
310 1030 485
305 1010 475
300 990 470
290 970 460
285 955 450
280 925 440
270 900 425
255 850 400
240 800 380
225 725 340
- - - - 620 295
- - - - 570 270
High
Watts cfm L/s
410 1230 580
400 1205 570
390 1190 560
380 1165 550
375 1140 540
365 1105 520
355 1080 510
335 1025 485
315 960 450
290 875 415
270 790 375
255 725 340
harness
Watts
375
370
365
355
350
345
335
320
305
290
265
255
Watts
450
445
440
430
425
415
405
390
370
350
330
315