Lennox furnace installation manual

E30 Smart Hub with Cover Removed. Figure 2. Smart Hub LED Indicators. Unit Type Jumpers. Set the unit type jumper for the type of indoor unit being used (see “Figure 1. Smart Hub External Components” on page 3 and “Table 3. Unit Type Jumpers Positions”). The factory default setting is IFC.

View and Download Lennox OHR23-105 installation instructions manual online. OHR23 Series Units. OIL UNITS. OHR23-105 furnace pdf manual download. Also for: Ohr23-120, Ohr23-140, Ohr23-154. Products that add to the performance of EL297V Gas Furnace. * The EL297V offers class-leading comfort with an energy rating of 97% AFUE. This high efficiency digital furnace is designed to pair with the Lennox S40 Smart Thermostat as part of a fully communicating home comfort system. It also qualifies for the United States federal Energy ... Disconnect the HFC−410A cylinder. Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set. Adjust dry nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set and the indoor unit.View and Download Lennox CBA25UH installation instructions manual online. Merit Series Air Handler Units, MULTI-POSITION AIR HANDLERS. CBA25UH air handlers pdf manual download. ... Related Manuals for Lennox CBA25UH. Air Conditioner Lennox CBA25UHV-018 Unit Information (33 pages)standard gas-fired furnace heat exchanger and at least 4" away from any drum-type or oil-fired furnace heat ex-changer. Closer spacing may damage the drain pan and cause a leak. Refer to the Product Specification bulletin (EHB) for the proper use of these coils with specific furnaces, outdoor units and line sets.EL296UHV(X) Revised 06/2021. icomfort®- ENABLED EL296UHV(X) SERIES UNITS. EL296UHV(X) series units are 90% efficiency gas furnaces used for upflow or horizontal applications only, manufac­ tured with Lennox Duralok heat exchangers formed of aluminized steel. EL296UHV(X) units are available in heat­ ing capacities of 44,000 to 132,000 Btuh ...Jun 17, 2019 ... Did you know that heat pumps can both heat and cool your home? New heat pumps are very energy efficient, which can help you save on your ...2011 lennox industries inc. dallas, texas, usa air flow upflow air flow air flow horizontal left horizontal right installation instructions el195uh elite® series gas furnace upflow / …

Download 1064 Lennox Furnace PDF manuals. User manuals, Lennox Furnace Operating guides and Service manuals.Feb 21, 2019 ... How to wire and install an ignition control HVAC Honeywell s8610u universal intermittent pilot control The S8610U Universal Replacement ...Drill a 5/16" test hole in the coil case 1" from the furnace flange (test hole 1, figure 11). Drill a 5/16" test hole into the supply air duct (test hole 2, figure 11). Connect the zero end of the draft gauge scale to the furnace end of the coil. Insert the hoses so that 1/4" extends inside the duct or end seal.Download this manual. S e r v i c e L i t e r a t u r e. EL280UHE (X) series units are 80% efficiency gas furnac-. es used for upflow or horizontal applications only, manu-. factured with Lennox Duralok heat exchangers formed of. aluminized steel. Units are available in heating capacities. of 44.000 to 110,000 Btuh and cooling applications up to.Furnace maintenance. Dirt is the biggest enemy of your furnace. It can waste fuel and drastically lower efficiency. In some cases, dirt buildup can even cause the furnace to overheat. Scheduling an annual checkup for your furnace is the most important part of regular furnace maintenance. LEARN MORE. Indoor Air Quality maintenanceLennox (NYSE: LII) is a leader in energy-efficient climate-control solutions. Dedicated to sustainability and creating comfortable and healthier environments for our residential and commercial customers while reducing their carbon footprint, we lead the field in innovation with our cooling, heating, indoor air quality, and refrigeration systems.View and Download Lennox ELITE Series installation instructions manual online. GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE. ELITE Series furnace pdf manual download. Also for: El196uhe, El196uh030xe36b, El196uh045xe36b, El196uh070xe36b, El196uh090xe48c, El196uh110xe60c.

Furnace maintenance. Dirt is the biggest enemy of your furnace. It can waste fuel and drastically lower efficiency. In some cases, dirt buildup can even cause the furnace to overheat. Scheduling an annual checkup for your furnace is the most important part of regular furnace maintenance. LEARN MORE. Indoor Air Quality maintenanceLennox, makes people feel comfortable in their homes. Lennox makes the air cooler, warmer, dryer, cleaner and better, with innovation. Service and repair parts for all your Lennox heating and air-conditioning equipment are here at HvacPartsShop.com. Need technical assistance? Contact us via Live Chat or call us at 1-866-215-3831. Drill a 5/16" (8 mm) test hole into the air supply duct connected to the coil. (test hole 2 in figure 15). Connect the zero end of the draft gauge scale to the furnace end of the coil. Insert the hoses so that 1/4" (6 mm) extends inside the duct or end seal. Seal around holes with Permagum. EL297UH045XV36B furnace pdf manual download. Also for: El297uhv series, El297uh070xv36b, El297uh090xv36c, El297uh090xv48c, El297uh090xv60c, El297uh110xv48c, El297uh110xv60c, El297uh135xv60d. ... Furnace Lennox EL296UHV Installation Instructions Manual. Elite series (66 pages) Furnace Lennox EL296UHV …What are manual transmission synchronizers? Visit HowStuffWorks.com to learn more about manual transmission synchronizers. Advertisement When you shift gears in your manual-transmi...

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Lennox® gas and oil furnaces promise unsurpassed comfort. Innovative design and technology automatically adjusts outputs in precise and minute increments to hold temperatures exactly where you want them. As quiet as they are efficient, Lennox furnaces combine advanced technology, engineering and sound-absorbing insulation to ensure whisper ... Drill a 5/16" (8 mm) test hole into the air supply duct connected to the coil. (test hole 2 in figure 15). Connect the zero end of the draft gauge scale to the furnace end of the coil. Insert the hoses so that 1/4" (6 mm) extends inside the duct or end seal. Seal around holes with Permagum.When the furnace is installed in an attic or other insu- lated space, keep insulation away from the furnace. Lennox does not recommend the use of SL280DFV units NOTE − The Commonwealth of Massachusetts stipu- as a construction heater during any phase of construction. Page 6: Combustion, Dilution & Ventilation Air Cements and glues supervisor.In the winter time, a good heating furnace can make all the difference in keeping you and your family warm. Goodman furnaces are one reputable line of furnaces for the cold months....Lennox (NYSE: LII) is a leader in energy-efficient climate-control solutions. Dedicated to sustainability and creating comfortable and healthier environments for our residential and commercial customers while reducing their carbon footprint, we lead the field in innovation with our cooling, heating, indoor air quality, and refrigeration systems.

INSTALLING THERMOSTAT. Unpacked the thermostat and open the case with a thin-blade screwdriver. Place between wall base and unit and twist to separate unit from base. Select a location for the thermostat about 5 feet (1.5m) above the floor in an area with good air circulation at average temperature.Page 3: Safety Instructions. WARNING Safety Instructions 1 - Keep the furnace area clear and free of combustible Do not set thermostat below 60°F (16°C) in heating material, gasoline, and other flammable vapors mode. Setting thermostat below 60°F (16°C) reduces and liquids. If it is installed in an insulated area, the the number of heating ...This will damage the iComfort®S30 and void the warranty. Install HD Display/Mag-Mount on outside walls or in direct sunlight. Install Smart Hub to indoor unit or equipment that could induce unit vibration to the unit. Exceed 300 feet (91m) run when using 18 GAUGE thermostat wire or larger.The model and serial numbers of each of the Lennox company’s furnaces is visible inside the top-front service panel of the furnace. The model and serial numbers are located by look...View and Download Lennox ELITE Series installation instructions manual online. GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE. ELITE Series furnace pdf manual download. Also for: El196uhe, El196uh030xe36b, El196uh045xe36b, El196uh070xe36b, El196uh090xe48c, El196uh110xe60c.Lennox (NYSE: LII) is a leader in energy-efficient climate-control solutions. Dedicated to sustainability and creating comfortable and healthier environments for our residential and commercial customers while reducing their carbon footprint, we lead the field in innovation with our cooling, heating, indoor air quality, and refrigeration systems. Lennox, makes people feel comfortable in their homes. Lennox makes the air cooler, warmer, dryer, cleaner and better, with innovation. Service and repair parts for all your Lennox heating and air-conditioning equipment are here at HvacPartsShop.com. Need technical assistance? Contact us via Live Chat or call us at 1-866-215-3831. Page 2: Unit Dimensions. EL296UHV Unit Dimensions - inches (mm) EXHAUST AIR 3−1/4 NOTE − 60C and 60D size units that require air OUTLET (83) volumes 1800 cfm or over (850 L/s) must have one of the following 1−7/8 (48) 1. Single side return air with transition, to accommodate 20 x 25 x 1 in.Lennox ELITE EL296UH070XE36B Installation Instructions Manual (58 pages) ELITE EL296UHE SERIES GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE. Brand: Lennox | Category: Furnace | Size: 2.08 MB.This furnace design has not been CSA International certified for installation in mobile homes, recreational vehicles, or outdoors. Use of Furnace as Construction Heater Lennox does not recommend the use of ML180UHE units as a construction heater during any phase of construction. Very low return air temperatures, harmful vapors and op­

Lennox EL296UH070XV36B Installation Instructions Manual (67 pages) EL296UHV series ELITE SERIIES GAS FURNACE UP/FLOW HORIZONTAL AIR DISCHARGE. Brand: Lennox | Category: Air Conditioner | Size: 7.16 MB.

G60UH(X) Gas Furnace The G60UH(X) gas furnace is equipped with a two−stage integrated control. Each G60UH(X) unit is shipped ready for installation in the upflow or horizontal position (left or right). The furnace is shipped with the bottom panel in place. The bottom panel must be removed if the unit is to be installed in a horizontal ...E 2008 Lennox Industries Inc. Dallas, Texas, USA 505,335M G71MPP 03/2009 Supersedes 03/2008 SERIES VARIABLE CAPACITY GAS FURNACE Litho U.S.A. WARNING FIRE OR EXPLOSION HAZARD. Failure to follow safety warnings exact- ly could result in serious injury, death, or property damage.Furnace maintenance. Dirt is the biggest enemy of your furnace. It can waste fuel and drastically lower efficiency. In some cases, dirt buildup can even cause the furnace to overheat. Scheduling an annual checkup for your furnace is the most important part of regular furnace maintenance. LEARN MORE. Indoor Air Quality maintenanceINSTALLATION INSTRUCTIONS G1D91BT, CG90TB, & G1D93BT High Efficiency 90+ Condensing Gas Furnace WARNING Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional informa- tion, consult a qualified installer, service agency, or the gas supplier.We have 3 Lennox SIGNATURE SLP99UH110XV60C manuals available for free PDF download: Unit Information, Manual, Installation Instructions Manual Lennox SIGNATURE SLP99UH110XV60C Manual (83 pages) Brand: Lennox | Category: Furnace | Size: 4.27 …Makes your air feel great, even in the summer. The EL296E also has the power to make your home feel better during summer months. By operating at its lower speed, air spends more time in contact with the outside coil, the cooling engine of your air-conditioning unit. This helps reduce moisture levels inside your home to enhance your comfort.The EL280DFE furnace may be installed in alcoves, clos-ets, attics, basements, garages, and utility rooms in the downflow position. This furnace design has not been CSA International certified for installation in mobile homes, recreational vehicles, or outdoors. Safety Lennox does not recommend the use of EL280DFE unitsLennox industries inc gas furnace user's information guide g23. Also See for G23 Series: User's information manual (6 pages) , Installation instructions manual (31 pages) 1. 2. 3. 4.April 28, 2022. We had the Lennox Elite Series EL296V, 2-stage, variable speed, high efficiency gas furnace installed 3 weeks ago. This unit is much more quiet than the 20 year old Rheem 90 series that it replaced. It took approximately one week for the "new burner" smell to go away. We also replaced our old manual thermostat with an EcoBee ...

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The furnace must be located or protected to avoid physical damage by vehicles. When a furnace is installed in a public garage, hangar, or other building that has a hazardous at­ mosphere, the furnace must be installed according to rec­ ommended good practice requirements and current Na­ tional Fuel Gas Code or CSA B149 standards.EL296UHV(X) series units are 90% efficiency gas furnaces used for upflow or horizontal applications only, manufac­ tured with Lennox Duralok heat exchangers formed of aluminized steel. EL296UHV(X) units are available in heat­ ing capacities of 44,000 to 132,000 Btuh and cooling ap­ plications up to 5 tons.For installation in a residential garage, the furnace must be installed so that the burner(s) and the ignition source are located no less than 18 inches (457 mm) above the floor. The furnace must be located or protected to avoid physical damage by vehicles. When a furnace is installed in a public garage, hangar, or other building that has a haz-View and Download Lennox ML196UHE installation instructions manual online. ML196UHE furnace pdf manual download. Also for: Merit series, Ml196uh030xe36b, …Return air tem- perature must not exceed 85°F (29°C) dry bulb. The SL280UHNV furnace may be installed in alcoves, closets, attics, basements, garages, and utility rooms in the upflow or horizontal position. This furnace is not designed for installation in mobile homes, recreational vehicles, or outdoors.This manual is also suitable for: View and Download Lennox Allied Air A96UH2E installation instructions manual online. Warm Air Gas Furnace. Allied Air A96UH2E furnace pdf manual download. Also for: 030-08, 045-12, 070-12, 090-16, 110-20.Single-stage furnace with Power Saver™ technology. Elite® takes the Lennox promise of exceptional comfort and performance to the next level. This superior product family delivers remarkable efficiency. It’s time to elevate your environment. It’s time for Lennox Elite®. Product Literature. Technical Documents.Related Manuals for Lennox Brentwood SP. ... J 05/2013 MODEL Brentwood SP This installation manual will enable you to obtain a safe, efficient and dependable installation of your fireplace system. ... It may starve other fuel burning appliances Aluminum Tape such as gas or oil furnaces. As well, exhaust blowers may compete for Outside air ... ….

Loosen nut on bleed port to release air and oil mixture from fuel line. Allow mix-ture to escape until a steady stream of oil is emitted from the port. Drain at least 1/2 pint of oil from the pump. Retighten the nut on bleed port. If lockout oc-curs, press reset button and continue with bleed proce-dure. View and Download Lennox EL180UHN installation instructions manual online. EL180UHN furnace pdf manual download. Also for: Elite series, El180uhne, El180uh040ne36a, El180uh060ne36a, El180uh080ne48b, …Download this manual. Service Literature. G60UHV (X) series units are mid−efficiency gas furnaces. used for upflow or horizontal applications only, manufac-. tured with Lennox Duralok Plus heat exchangers formed of. aluminized steel. G60UH (X) units are available in heating. capacities of 66,000 to 132,000 Btuh and cooling applica-.Download 1064 Lennox Furnace PDF manuals. User manuals, Lennox Furnace Operating guides and Service manuals.• When the furnace is installed in non−direct vent applications,<br /> do not install the furnace where drafts might blow<br /> directly into it. This could cause improper combustion<br /> and unsafe operation.<br /> • When the furnace is installed in non−direct vent applications,<br /> do not block the furnace combustion air opening<br />G61MP series units are high−efficiency multi−position (up-. flow, downflow, horizontal right and left) gas furnaces. manufactured with Lennox Duralok Plust heat exchang-. ers formed of aluminized steel. G61MP units are available. …Return air tem- perature must not exceed 85°F (29°C) dry bulb. The SL280UHNV furnace may be installed in alcoves, closets, attics, basements, garages, and utility rooms in the upflow or horizontal position. This furnace is not designed for installation in mobile homes, recreational vehicles, or outdoors.View and Download Lennox ELITE Series installation instructions manual online. GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE. ELITE Series furnace pdf manual download. Also for: El196uhe, El196uh030xe36b, El196uh045xe36b, El196uh070xe36b, El196uh090xe48c, El196uh110xe60c. Lennox furnace installation manual, Oct 13, 2018 ... Welcome to my YouTube channel! For all your business management needs, I highly recommend using Jobber. Whether you're an HVAC professional ..., Page 1: Table Of Contents INSTALLATION INSTRUCTIONS E 2013 Lennox Industries Inc. Dallas, Texas, USA ML193UH ® MERIT SERIES GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE 507121-01 Litho U.S.A. 08/2013 Supersedes 06/2013 THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE This is a safety alert symbol and should never be ignored. , INSTALLATION INSTRUCTIONS E 2010 Lennox Industries Inc. Dallas, Texas, USA G43UF MERIT SERIES GAS FURNACE UPFLOW AIR DISCHARGE 506497−01 03/2010 Supersedes 505,064M Litho U.S.A. THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE This a safety alert symbol and should …, April 28, 2022. We had the Lennox Elite Series EL296V, 2-stage, variable speed, high efficiency gas furnace installed 3 weeks ago. This unit is much more quiet than the 20 year old Rheem 90 series that it replaced. It took approximately one week for the "new burner" smell to go away. We also replaced our old manual thermostat with an EcoBee ..., 1 Indoor coils with the same letter designation physically matches the furnace. AFUE 99 = 99% Low NOx X = Units meet California Nitrogen Oxides Standard (40 ng/J) Cabinet Width B = 17-1/2 in. C = 21 in. D = 24-1/2 in. SLP99UHV UPFLOW/HORIZONTAL GAS FURNACES GAS FURNACES MODEL NUMBER IDENTIFICATION iComfort® S30 …, DAVE LENNOX SIGNATURE® COLLECTION GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE 506610−01 05/2011 Supersedes 12/2010 THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE This a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death ... , View and Download Lennox ELITE Series installation instructions manual online. GAS FURNACE DOWNFLOW AIR DISCHARGE. ELITE Series furnace pdf manual download. Also for: Elite el196dfe, El196df045xe36b, El196df070xe48b, El196df090xe48c., Return air tem- perature must not exceed 85°F (29°C) dry bulb. The SL280UHNV furnace may be installed in alcoves, closets, attics, basements, garages, and utility rooms in the upflow or horizontal position. This furnace is not designed for installation in mobile homes, recreational vehicles, or outdoors., INSTALLING THERMOSTAT. Unpacked the thermostat and open the case with a thin-blade screwdriver. Place between wall base and unit and twist to separate unit from base. Select a location for the thermostat about 5 feet (1.5m) above the floor in an area with good air circulation at average temperature., Feb 21, 2019 ... How to wire and install an ignition control HVAC Honeywell s8610u universal intermittent pilot control The S8610U Universal Replacement ..., Title: lennox g61 gas furnace manual Author: dar2 Subject: lennox g61 gas furnace manual Keywords: furnace, gas furnaces, gas furnace, home furnace, residential ..., The quietest and most efficient furnace you can buy. The Dave Lennox Signature® Collection is the ultimate in creating the ideal home. From supreme efficiency to unprecedented performance, this product family delivers incomparable comfort. For those unwilling to settle for anything less than extraordinary, there is only one option: Dave Lennox ..., MANUAL ©2017 Lennox Industries Inc. Dallas, Texas, USA 506476-01 04/2017 Supersedes 03/2017 ML193DF SERIES GAS FURNACE WARNING Improper …, Download this manual. Service Literature. 80MGF series units are mid−efficiency gas furnaces. manufactured with tubular heat exchangers formed of alu-. minized or stainless steel. 80MGF units are available in. heating capacities of 45,000 to 140,000 Btuh and cooling. applications up to 5 tons. , Apr 7, 2015 ... How to replace and install 57M85 draft inducer on a Lennox G61 LP furnace. Part can be purchased from HVAC Parts and More here: ..., Apr 25, 2022 · Furnace maintenance. Dirt is the biggest enemy of your furnace. It can waste fuel and drastically lower efficiency. In some cases, dirt buildup can even cause the furnace to overheat. Scheduling an annual checkup for your furnace is the most important part of regular furnace maintenance. LEARN MORE. Indoor Air Quality maintenance , III-Start-Up. 43. IV-Heating System Service Checks. 44. VI-Maintenance. 49. Advertisement. Lennox ML196UH070XE36B Pdf User Manuals. View online or download Lennox ML196UH070XE36B Unit Information, Installation Instructions Manual., We have 4 Lennox EL296UH110XV60C manuals available for free PDF download: Unit Information, Installation Instructions Manual Lennox EL296UH110XV60C Unit Information (114 pages) Brand: Lennox | Category: Furnace | Size: 11.82 MB, View and Download Lennox ML196UHE installation instructions manual online. ML196UHE furnace pdf manual download. Also for: Merit series, Ml196uh030xe36b ..., The SLP98DFV furnace may be installed in alcoves, clos - ets, attics, basements, garages, and utility rooms. This furnace is not designed for installation in mobile homes, recreational vehicles, or outdoors. Never use an open flame to test for gas leaks. Check all connections using a commercially available soap solution, Improper installation, adjustment, alteration, service or maintenance can cause property damage, person-al injury or loss of life. Installation and service must be performed by a licensed professional installer (or equivalent), a service agency, or the gas supplier. Safety Instructions 1 − Keep the furnace area clear and free of combustible, Properly label these devices. NOTE - Install an 1/8 inch NPT plugged tap into the field piping. Page 17 The furnace must be isolated from the gas supply system by closing its individual manual shut off valve during any pressure testing of the gas supply system at pressures equal to or greater than 1/2 psig (3.48 kPa). NOTE-Capacity given in ..., Related Manuals for Lennox G11 series. Heater Lennox LF25 Series Installation Instructions Manual (22 pages) Heater Lennox LF24-100 Installation Instructions Manual. Lf24 100,000 to 400,000 btuh series (18 pages) Heater Lennox LF24 Manual. Unit heaters horizontal-60 hz (13 pages), Save energy every month. An energy-efficient design means this furnace keeps your home comfortable and saves on monthly utility bills. Plus, when paired with a programmable thermostat, you could save up to 35% in utility costs., The EL280DFE furnace may be installed in alcoves, clos-ets, attics, basements, garages, and utility rooms in the downflow position. This furnace design has not been CSA International certified for installation in mobile homes, recreational vehicles, or outdoors. Safety Lennox does not recommend the use of EL280DFE units , In Canada, installation must conform with current National Standard of Canada CSA-B149 Natural Gas and Propane Installation Codes, local plumbing or waste water codes and other applicable local codes. This furnace is designed for installation clearances to com-bustible material as listed on the unit nameplate and in the tables in figures 10 and 11., MANUAL ©2017 Lennox Industries Inc. Dallas, Texas, USA 506476-01 04/2017 Supersedes 03/2017 ML193DF SERIES GAS FURNACE WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional …, The ML196UHE furnace may be installed in alcoves, clos-ets, attics, basements, garages, crawl spaces and utility rooms in the upflow or horizontal position. This furnace design has not been CSA certified for instal-lation in mobile homes, recreational vehicles, or outdoors. Use of Furnace as Construction Heater, Pre-service checklist. Before a visit from your Lennox Dealer, it may be helpful to review this list of tips so that you are well prepared. Take a look at our …, Lennox EL195UH070XE36B Pdf User Manuals. View online or download Lennox EL195UH070XE36B Unit Information ... Lennox Manuals; Furnace; EL195UH070XE36B; Lennox EL195UH070XE36B Manuals. Manuals and User Guides for Lennox EL195UH070XE36B. We have 1 Lennox EL195UH070XE36B manual available for free …, Lennox (NYSE: LII) is a leader in energy-efficient climate-control solutions. Dedicated to sustainability and creating comfortable and healthier environments for our residential and commercial customers while reducing their carbon footprint, we lead the field in innovation with our cooling, heating, indoor air quality, and refrigeration systems. , E 2015 Lennox Industries Inc. Dallas, Texas, USA 506525-01 ML180UH 01/2015 Supersedes 10/2012 SERIES GAS FURNACE WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional installer (or Litho U.S.A., Furnace maintenance. Dirt is the biggest enemy of your furnace. It can waste fuel and drastically lower efficiency. In some cases, dirt buildup can even cause the furnace to overheat. Scheduling an annual checkup for your furnace is the most important part of regular furnace maintenance. LEARN MORE. Indoor Air Quality maintenance