Lennox G40DF Series User Manual

Page 26
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:
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.
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
Static
Pressure
in. w.g.
Air Volume / Watts at Different Blower Speeds
High Medium Low
cfm Watts cfm Watts cfm Watts
0.00
1200 417 1060 367 830 278
0.05 1185 410 1040 360 820 274
0.10 1165
402 1025 353 810 270
0.15
1145 396 1010 346 795 265
0.20 1125 390 990 338 775 260
0.25 1105
382 980 335 765 257
0.30 1080 374 965 331 750 254
0.40 1020 357 920 319 710 244
0.50 960
342 875 306 650 234
0.60 900 330 810 290 620 231
0.70 815 313 690 272 565 221
0.80 685 289 620 259 465 203
0.90
560 271 510 238 395 190
G40DF−36A−070 PERFORMANCE
External
Static
Pressure
in. w.g.
Air Volume / Watts at Different Blower Speeds
High
Medium−
High
Medium−
Low
Low
cfm Watts cfm Watts cfm Watts cfm Watts
0.00
1475 616 1345 554 1150 495 990 415
0.05 1450 606 1320 543 1140 481 985 407
0.10 1425
595 1300 532 1125 466 975 398
0.15 1395 585 1275 521 1115 452 970 390
0.20 1375 574 1255 510 1105 437 965 381
0.25 1345 563 1230 494 1090 428 955 371
0.30 1320 552 1205 478 1075 418 945 360
0.40 1250 528 1150 455 1040 395 920 346
0.50 1200 508 1095 432 1000 374 880 331
0.60 1110 475 1035 409 950 354 830 313
0.70 1030 455 970 390 855 338 720 280
0.80 960
434 875 359 735 299 665 266
0.90 770 389 715 321 665 278 590 244
G40DF−36B−090 PERFORMANCE
External
Static
Pressure
in. w.g.
Air Volume / Watts at Different Blower Speeds
High
Medium−
High
Medium−
Low
Low
cfm Watts cfm Watts cfm Watts cfm Watts
0.00
1600 608 1410 526 1165 436 965 355
0.05 1580 599 1400 518 1165 428 965 351
0.10 1560
589 1390 509 1160 420 970 346
0.15
1530 573 1370 497 1155 413 965 341
0.20 1495 556 1350 485 1150 406 965 335
0.25 1465 544 1325 473 1135 398 955 329
0.30
1430 532 1300 460 1125 389 945 323
0.40 1370 509 1250 438 1095 373 935 313
0.50 1295
482 1200 420 1055 355 900 302
0.60
1215 456 1140 397 1010 343 860 285
0.70 1140 437 1055 371 915 313 800 272
0.80 1000
401 950 342 850 295 730 251
0.90
900 374 820 313 740 272 − − − − − −
G40DF−48C−090 PERFORMANCE
External
Static
Pressure
in. w.g.
Air Volume / Watts at Different Blower Speeds
High
Medium−
High
Medium−
Low
Low
cfm Watts cfm Watts cfm Watts cfm Watts
0.00 2040 749 1850 657 1595 562 1325 466
0.05 2000 727 1825 638 1575 547 1340 460
0.10 1955
704 1800 619 1555 532 1350 453
0.15
1920 692 1770 602 1540 518 1340 441
0.20 1885 679 1740 585 1525 503 1330 428
0.25 1845
662 1700 568 1500 488 1300 414
0.30
1800 645 1665 551 1475 473 1270 399
0.40 1695 606 1585 517 1415 448 1225 378
0.50 1600
570 1490 485 1335 414 1170 360
0.60
1495 540 1405 457 1250 389 1110 337
0.70 1380 509 1300 426 1165 367 1025 316
0.80 1250 478 1160 390 1025 331 − − − − − −
0.90
1095 439 1030 360 925 307 − − − − − −

Lennox G40DF Series Specifications

General

Brand	Lennox
Model	G40DF Series
Category	Furnace
Language	English