Lennox International Inc Merit Series Gas Furnace 453 900, 750, 680, 885, 735, 670, 870 315 720

Page 33

BLOWER DATA

ML180UH045P24A PERFORMANCE (Less Filter)

External

Air Volume / Watts at Various Blower Speeds

Static

High

Medium-

Medium-

Low

Pressure

High

Low

 

 

 

 

in. w.g.

cfm

Watts

cfm

Watts

cfm

Watts

cfm

Watts

0.00

1130

453

900

328

750

261

680

237

0.10

1115

432

885

321

735

255

670

230

0.20

1100

413

870

315

720

249

655

223

0.30

1070

396

855

304

700

241

640

217

0.40

1030

375

830

294

685

234

620

209

0.50

990

356

800

283

655

223

590

200

0.60

930

335

750

261

610

207

535

186

0.70

870

315

705

245

540

193

490

175

0.80

785

285

615

223

455

175

405

158

0.90

615

247

485

196

375

157

345

143

ML180UH070P36A PERFORMANCE (Less Filter)

External

Air Volume / Watts at Various Blower Speeds

Static

High

Medium-

Medium-

Low

Pressure

High

Low

 

 

in. w.g.

cfm Watts cfm Watts

cfm Watts cfm Watts

0.001660 696 1370 604 1095 495 935 386

0.101620 658 1365 568 1115 468 945 374

0.201580 621 1355 535 1135 442 960 362

0.301520 595 1335 513 1130 423 955 350

0.401480 562 1300 478 1100 403 945 335

0.501400 520 1270 450 1080 382 925 320

0.601340 490 1205 420 1035 358 880 301

0.701245 458 1125 393 975 333 835 282

0.801160 434 1045 364 915 310 775 262

0.901045 393 940 334 830 283 785 268

ML180UH045P36A PERFORMANCE (Less Filter)

External

Air Volume / Watts at Various Blower Speeds

Static

High

Medium-

Medium-

Low

Pressure

High

Low

 

 

in. w.g.

cfm Watts cfm Watts

cfm Watts cfm Watts

0.001670 711 1335 614 1140 485 925 388

0.101620 663 1335 577 1130 470 940 376

0.201570 619 1330 543 1115 455 950 366

0.301525 598 1315 511 1140 432 950 349

0.401470 552 1275 491 1125 413 945 336

0.501400 525 1235 455 1085 384 925 317

0.601330 486 1185 422 1050 361 885 300

0.701225 450 1135 395 995 336 840 283

0.801135 418 1010 359 925 315 785 258

0.901020 388 930 329 820 278 650 227

ML180UH090P36B PERFORMANCE (Less Filter)

External

Air Volume / Watts at Various Blower Speeds

Static

High

Medium-

Medium-

Low

Pressure

High

Low

 

 

in. w.g.

cfm Watts cfm Watts

cfm Watts cfm Watts

0.001795 781 1450 606 1195 464 970 390

0.101760 730 1435 576 1185 452 970 378

0.201725 683 1420 547 1170 440 975 368

0.301685 656 1410 525 1170 420 980 356

0.401630 625 1370 501 1150 400 955 340

0.501535 569 1315 469 1125 391 925 326

0.601470 533 1275 440 1085 367 910 309

0.701365 490 1185 407 1020 344 840 290

0.801255 466 1105 380 935 314 785 266

0.901160 430 1000 352 815 285 680 258

ML180UH070P24A PERFORMANCE (Less Filter)

External

Air Volume / Watts at Various Blower Speeds

Static

 

 

 

 

 

 

 

High

Medium

 

Low

Pressure

 

 

 

 

 

 

 

cfm

Watts

cfm

Watts

cfm

 

Watts

in. w.g.

 

0.00

1160

450

1005

380

865

 

309

0.10

1135

439

990

369

845

 

299

0.20

1115

429

975

358

820

 

289

0.30

1085

410

955

348

790

 

279

0.40

1045

389

925

335

775

 

270

0.50

1015

374

885

321

735

 

260

0.60

965

358

835

307

700

 

248

0.70

890

335

780

289

635

 

232

0.80

810

315

700

268

560

 

214

0.90

715

289

565

238

420

 

189

ML180UH090P48B PERFORMANCE (Less Filter)

External

Air Volume / Watts at Various Blower Speeds

Static

High

Medium-

Medium-

Low

Pressure

High

Low

 

 

in. w.g.

cfm Watts cfm Watts

cfm Watts cfm Watts

0.002160 873 1825 775 1515 649 1260 544

0.102030 804 1780 719 1525 613 1280 518

0.201910 740 1740 666 1535 580 1305 493

0.301840 698 1705 643 1500 551 1305 474

0.401770 664 1635 594 1460 517 1280 445

0.501665 625 1560 567 1410 483 1225 420

0.601585 595 1470 523 1330 451 1190 391

0.701470 561 1365 483 1260 421 1115 368

0.801355 514 1230 433 1155 392 1020 338

0.90

1200

471

1120

399

1020

345

920

315

Page 33

Image 33
Contents Table of Contents Installation Instructions ML180UHTOP View Unit Dimensions − inches mmParts Arrangement Safety Information ML180UH Gas FurnaceShipping and Packing List General Use of Furnace as Construction HeaterCombustion, Dilution & Ventilation Air Equipment in Confined Space ALL AIR from Inside Equipment in Confined Space Setting Equipment Return Air Plenum Horizontal Application Installation Clearances Top Left RightEnd Bottom Duct System FiltersUpflow Position VentingTop Vent Discharge Left Side Vent DischargeHorizontal Left Position Horizontal Right PositionSide Vent Discharge Vent Connection Upflow and Horizontal Position Common Venting Using Metal−Lined Masonry Chimney −1/2 18 − The common vent diameter must always be at least as Cated or common venting system, you must inspectFeet FAN + FAN FAN + NAT 112 175 169 278 Carbon Monoxide Poisoning Hazard − In some localities, codes may require the installation Ers or straps. Install a drip leg in vertical pipe runs toGas Piping Every 8 to 10 feet 2.44 to 3.01 m with suitable hangHorizontal Application Left−Side Air DischargeRight−Side Air Discharge Interior MAKE−UP BOX Installation ElectricalElectrostatic Discharge ESD Thermostat Designations ML180UH Schematic Wiring Diagram and Sequence of Operation Integrated Control Typical ML180UH Field Wiring DiagramUnit Start−Up For Your Safety Read Before LightingGas Pressure Adjustment Proper CombustionHigh Altitude Manifold Pressure Settings at all Altitudes Other Unit AdjustmentsNo Jumper Heat FAN-OFF Time in Seconds750 453 900680 8851391 Single Side Return Air − Air volumes in bold require field860 653Electrical SHOCK, Fire Or Explosion Hazard ServiceHeat Exchanger Removal ML180UH BURNER, Combustion AIR Inducer Assembly−090, −110 −135 units −045 and −070 unitsPage Repair Parts List Planned ServiceDescription Integrated Control Diagnostic CodesNormal Heating Mode Abnormal Heating Mode Troubleshooting Heating Sequence of OperationHeating Sequence Normal Cooling Mode Abnormal Cooling Mode Troubleshooting Cooling Sequence of OperationContinuous Heat Speed FAN Sequence of Operation Troubleshooting Continuous Fan Sequence of Operation

Merit Series Gas Furnace specifications

Lennox International Inc. is a leading name in the heating and cooling industry, and their Merit Series Gas Furnace embodies the commitment to quality and efficiency that the company is known for. The Merit Series is designed to provide reliable heating in a sustainable manner, making it an excellent choice for homeowners seeking comfort without excessive energy bills.

One of the standout features of the Merit Series Gas Furnace is its efficiency ratings. The units in this series typically boast Annual Fuel Utilization Efficiency (AFUE) ratings of up to 95%. This level of efficiency means that the furnace converts a significant portion of the fuel it uses into heat, ultimately lowering operating costs. Such energy-efficient performance is not only beneficial for the wallet but also promotes environmental sustainability.

The Merit Series also incorporates advanced technologies that enhance its operation. The inclusion of a multi-speed blower motor is a notable feature that provides thoughtful airflow management throughout the home. By adjusting the speed according to the heating needs, the furnace optimizes comfort levels while minimizing noise and energy consumption. Homeowners can enjoy a warm environment without the disruptive sounds often associated with traditional furnaces.

Moreover, the Merit Series comes equipped with durable construction materials designed to withstand the test of time. From the robust heat exchanger to the heavy-gauge cabinet, Lennox focuses on longevity and reliability. This ensures that homeowners can trust their furnace to operate effectively even in the harshest winter conditions.

Safety features are also integral to the design of the Merit Series Gas Furnace. With an integrated Flame Sensor and a built-in safety shut-off system, the furnace ensures that any irregularities in operation are promptly detected and addressed. Such measures provide peace of mind for families using the heating system throughout the cold months.

Installation and maintenance are further simplified with the Merit Series. Its design facilitates easier access for HVAC professionals, allowing for quicker installations and routine service, ensuring that homeowners spend less time and money on upkeep.

In conclusion, Lennox International Inc.'s Merit Series Gas Furnace combines efficiency, advanced technology, and robust construction, making it a top choice for families looking to enhance their home's heating system. With its energy-saving innovations and commitment to reliability, the Merit Series stands as an exemplary option in today’s market.