Blower Performance - Lennox G40DF Series Installation Instructions Manual

Flue And Chimney
1 − Check flue pipe, chimney and all connections for tight-
ness and to make sure there is no blockage.
2 − Check unit for proper draft.
3 − Is pressure switch closed? Obstructed flue will cause
unit to shut off at pressure switch. Check flue and outlet
for blockages.
4 − Reset manual flame rollout switches on burner box
cover.
Failure To Operate
If the unit fails to operate, check the following:

Blower Performance

NOTE − All air data is measured external to unit with 1 in. cleanable filter (not furnished − field provided) in place.
G40DF−24A−045 PERFORMANCE
External
Air Volume / Watts at Different Blower Speeds
Static
High
Pressure
cfm Watts
in. w.g.
0.00 1200 417
0.05 1185 410
0.10 1165 402
0.15 1145 396
0.20 1125 390
0.25 1105 382
0.30 1080 374
0.40 1020 357
0.50 960 342
0.60 900 330
0.70 815 313
0.80 685 289
0.90 560 271
G40DF−36A−070 PERFORMANCE
Air Volume / Watts at Different Blower Speeds
External
Medium−
Static
High
Pressure
in. w.g.
cfm Watts cfm Watts cfm Watts cfm Watts
0.00 1475 616 1345 554 1150 495
0.05 1450 606 1320 543 1140 481
0.10 1425 595 1300 532 1125 466
0.15 1395 585 1275 521
0.20 1375 574 1255 510 1105 437
0.25 1345 563 1230 494 1090 428
0.30 1320 552 1205 478 1075 418
0.40 1250 528 1150 455 1040 395
0.50 1200 508 1095 432 1000 374
0.60 1110 475 1035 409
0.70 1030 455 970
0.80 960 434 875
0.90 770 389 715
Medium Low
cfm Watts cfm Watts
1060 367 830
1040 360 820
1025 353 810
1010 346 795
990 338 775
980 335 765
965 331 750
920 319 710
875 306 650
810 290 620
690 272 565
620 259 465
510 238 395
Medium−
Low
High Low
990
985
975
1115 452 970
965
955
945
920
880
950 354 830
390 855 338 720
359 735 299 665
321 665 278 590
1 − Is the thermostat calling for heat?
2 − Are access panels securely in place?
3 − Is the main disconnect switch closed?
4 − Is there a blown fuse?
5 − Is the filter dirty or plugged? Dirty or plugged filters will
cause the limit control to shut the unit off.
6 − Is gas turned on at the meter?
7 − Is the manual main shut-off valve open?
8 − Is the internal manual shut-off valve open?
9 − Is the unit ignition system in lock out? If the unit locks out
again, inspect the unit for blockages.
G40DF−36B−090 PERFORMANCE
Air Volume / Watts at Different Blower Speeds
External
Static
Pressure
in. w.g.
cfm Watts cfm Watts cfm Watts cfm Watts
278
0.00 1600 608 1410 526 1165 436
274
0.05 1580 599 1400 518 1165 428
270
0.10 1560 589 1390 509 1160 420
265
0.15 1530 573 1370 497 1155 413
260
0.20 1495 556 1350 485 1150 406
257
0.25 1465 544 1325 473 1135 398
254
0.30 1430 532 1300 460 1125 389
244
0.40 1370 509 1250 438 1095 373
234
0.50 1295 482 1200 420 1055 355
231
0.60 1215 456 1140 397 1010 343
221
0.70 1140 437 1055 371
203
0.80 1000 401
190
0.90 900
G40DF−48C−090 PERFORMANCE
Air Volume / Watts at Different Blower Speeds
External
Static
Pressure
in. w.g.
cfm Watts cfm Watts cfm Watts cfm Watts
415
0.00 2040 749 1850 657 1595 562 1325 466
407
0.05 2000 727 1825 638 1575 547 1340 460
398
0.10 1955 704 1800 619 1555 532 1350 453
390
0.15 1920 692 1770 602 1540 518 1340 441
381
0.20 1885 679 1740 585 1525 503 1330 428
371
0.25 1845 662 1700 568 1500 488 1300 414
360
0.30 1800 645 1665 551 1475 473 1270 399
346
0.40 1695 606 1585 517 1415 448 1225 378
331
0.50 1600 570 1490 485 1335 414 1170 360
313
0.60 1495 540 1405 457 1250 389
280
0.70 1380 509 1300 426 1165 367 1025 316
266
0.80 1250 478 1160 390 1025 331
244 0.90 1095 439 1030 360
Page 26
Medium− Medium−
High
High Low
915
950 342 850
374 820 313 740
Medium− Medium−
High
High Low
925
Low
965 355
965 351
970 346
965 341
965 335
955 329
945 323
935 313
900 302
860 285
313 800 272
295 730 251
272 − − − − − −
Low
1110 337
− − − − − −
307 − − − − − −