Lennox CB29M, Installation Manual

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