Lennox International Inc G50UH-48C-135, G50UH-48C-110, G50UH-60D-135, G50UH-36C-110 Acaution

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Inthepast,therewasnoprobleminbringinginsufficientout- doorairforcombustionInfiltrationprovidedalltheairthat. wasneededIntoday'shomes,tightconstructionpractices.

makeit necessaryto bringin airfromoutsideforcombus- tion.Takeintoaccountthatexhaustfans,appliancevents, chimneys,andfireplacesforceadditionalairthatcouldbe usedforcombustionoutofthehouse.Unlessoutsideairis

broughtintothehousefor combustion,negativepressure (outsidepressureisgreaterthaninsidepressure)willbuild tothepointthatadowndraftcanoccurinthefurnacevent pipeorchimneyAsaresult,combustiongasesentertheliv.- ingspacecreating potentiallydangeroussituation.

Intheabsenceoflocalcodesconcerningairforcombus- tionandventilation,usetheguidelinesandproceduresin thissectiontoinstallG50UH(X)furnacestoensureefficient andsafeoperationYoumustconsidercombustionair. needsandrequirementsforexhaustventsandgaspiping. A portionof thisinformationhasbeenreprintedwithper- missionfromtheNationalFuelGasCode(ANSI-Z223.1). Thisreprintedmaterialisnotthecompleteandofficialposi- tionoftheANSIonthereferencedsubject,whichisrepre- sentedonlybythestandardin itsentirety.

In Canada,referto the standardCSAB149installation codes.

ACAUTION

ACAUTION

All gas-fired appliances require air for the combustion pro- cess. If sufficient combustion air is not available, the fur- nace or other appliances will operate inefficiently and un- safely. Enough air must be provided to meet the needs of all fuel-burning appliances and appliances such as exhaust fans which force air out of the house. When fireplaces, ex- haust fans, or clothes dryers are used at the same time as the furnace, much more air is necessary to ensure proper combustion and to prevent a downdraft. Insufficient air causes incomplete combustion which can result in carbon monoxide,

In addition to providing combustion air, fresh outdoor air dilutes contaminants in the indoor air. These contami- nants may include bleaches, adhesives, detergents, sol- vents and other contaminants which can corrode furnace components,

The requirements for providing air for combustion and ven- tilation depend largely on whether the furnace is installed in an unconfined or a confined space,

Unconfined Space

An unconfined space is an area such as a basement or large equipment room with a volume greater than 50 cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the com- bined input rating of all appliances installed in that space. This space also includes adjacent rooms which are not separated by a door. Though an area may appear to be un- confined, it might be necessary to bring in outdoor air for combustion if the structure does not provide enough air by infiltration. If the furnace is located in a building of tight construction with weather stripping and caulking around the windows and doors, follow the procedures in the air from outside section.

Confined Space

A confined space is an area with a volume less than 50 cu- bic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the combined input rating of all appliances installed in that space. This definition includes furnace closets or small equipment rooms.

When the furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space contain- ing the furnace, the return air must be handled by ducts which are sealed to the furnace casing and which terminate outside the space containing the furnace, This is especially important when the furnace is mounted on a platform in a confined space such as a closet or small equipment room. Even a small leak around the base of the unit at the platform or at the return air duct connection can cause a potentially dangerous negative pressure condition, Air for combustion and ventilation can be brought into the confined space either from inside the building or from outside,

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Contents G50UHX Series Supply AIR Gasket FlueTransition FlueBoxGasket HeatExchanger FlueCollectorBoxPackage 1 of 1 contains Wheninstalled,thisfurnacemustbeelectricallygrounded Canada,referto the standardCSAB149installation codes AcautionWiTER/ Room Air from InsideMm at unit front. The unit must be level Equipment in Confined Space ALL AIR from Outside27-5/8 Side View Front ViewRemoving the Bottom Panel Leveling Bolt Installation Inches mmRemovingthe Bottom Panel Leveling an Upflow UnitHorizontal Application Unit Installed on Platform Combustion Air Inducer Filter SizeSupply Air Plenum HoleThelatesteditionof NationalFuelGasCodeNFPA54 Venting Using a Masonry ChimneyOutletopeningSeefigure15 Vent ConnectionSingle appliance Common Venting Using Tile-Lined Interior Masonry ChimneCombined Vent Connector Minimum Vent capacityMaximum Horizontal Inches mm MIN MAX Serving a Single Category I Appliance Type B Double-WallVents with Type B Double-Wall Connectors Serving Two or More Category I AppliancesVent Removal of the Furnace from Common VentPropaneInstallationCodesinCanada Gas Pipe Capacity ft3/hr m3/hrLeak Check Precautions and ProceduresInterior MAKE-UP BOX Installation Electrostatic Discharge ESDPowER @1HsuN,T INTERIORMAKE-UP BOX InstallationTypical G50UHX Field Wiring Diagram Zk for Correct Number of SecondaryG5OUHX SotFor Your Safety Read Before Lighting ManifoldHoneywell VR8205 Gas Valve with ON/OFF Switch RevolutionPrimary and Secondary Limits FlueAnd Chimney CheckunitforproperdraftG50UHX Burner & Heat Exchanger Removal Ak Caution Diagnostic Normal Heating Mode Abnormal Heating Mode Surelight Control=-l YESlNormalcooling Mode Abnormalcooling Mode YESlYEs BlowerMotorAmps FurnaceBtuInput

G50UH-60D-155, G50UH-36B-090, G50UH-36A-070, G50UH-24A-045, G50UH-60D-135 specifications

Lennox International Inc is renowned for its high-quality heating, ventilation, and air conditioning (HVAC) solutions. Among its versatile product lineup are the G50UH series of gas furnaces, which exemplify efficiency and performance. These models, specifically the G50UH-24A-070, G50UH-24A-045, G50UH-36B-090, G50UH-36A-070, and G50UH-48C-135, offer a range of features tailored to meet varying residential heating demands.

One of the key features of the G50UH series is its energy efficiency. Many models in this lineup boast an impressive Annual Fuel Utilization Efficiency (AFUE) rating, which indicates their ability to convert fuel into usable heat efficiently. These high AFUE ratings can lead to significant savings on energy bills, making these furnaces a cost-effective choice for homeowners.

The G50UH series incorporates advanced technology, including multi-speed blowers that enhance comfort levels. This feature allows for better airflow control and can help maintain consistent temperatures throughout the home. The controlled airflow reduces temperature swings and ensures that every room benefits from the heating provided by the furnace.

Safety is paramount in Lennox designs, and the G50UH series is no exception. Each unit is equipped with safety features designed to protect both the furnace and the home. Dual certification ensures that the products meet stringent safety standards. Moreover, features like a self-diagnostic control board streamline maintenance, allowing homeowners to easily identify potential issues.

Another important characteristic of the G50UH series is its compact design, which is beneficial for homes with limited space. The units are designed to fit comfortably in various installation environments, from basements to utility rooms.

Durability is another hallmark of the G50UH furnaces. Constructed with quality materials, these units are designed for long-term reliability. This ensures that homeowners can enjoy the comfort of their heating systems without frequent repairs.

Lastly, Lennox provides extensive support and warranties, giving homeowners peace of mind associated with their purchase. With options tailored to meet diverse home heating needs, the Lennox G50UH series stands out in the HVAC market, combining efficiency, safety, and reliability in one impressive package.
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