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Manafacture: Lennox International Inc. File size: 2.2 mb File name: Language of manual:

NOTE -This furnace is designed for a minimum continuous return air temperature of 60°F (16°C) or an intermittent operation down to 55°F (13°C) dry bulb for cases where a night setback thermostat is used. Return air temperature must not exceed 85°F (29 °C) dry bulb. The G50UH(X) furnace may be installed in alcoves, closets, attics, basements, garages, and utility rooms in the up- flow or horizontal position. This furnace design has not been CSA International certified for installation in mobile homes, recreational vehicles, or outdoors. Lennox does not recommend the use of G50UH units as a construction heater during any phase of construction. Very low return air temperatures, harmful vapors and operation of the unit with clogged or misplaced filters will damage the unit. G50UH units may be used for heating of buildings or struc tures under construction, if the following conditions are met: • The vent system must be permanently installed per these installation instructions. • A room thermostat must control the furnace. The use of fixed jumpers that will provide continuous heating is not allowed. • The return air duct must be provided and sealed to the furnace. • Return air temperature range between 60°F (16°C) and 80°F (27°C) must be maintained. • Air filters must be installed in the system and must be maintained during construction. • Air filters must be replaced upon construction completion. • The input rate and temperature rise must be set per the furnace rating plate. • One hundred percent (100%) outdoor air must be provided for combustion air requirements during construction. Temporary ducting may supply outdoor air to the furnace. Do not connect duct directly to the furnace. Size the temporary duct following these instructions in section for Combustion, Dilution and Ventilation Air in a confined space with air from outside. • The furnace heat exchanger, components, duct system, air filters and evaporator coils must be thoroughly cleaned following final construction clean-up. • All furnace operating conditions (including ignition, input rate, temperature rise and venting) must be verified according to these installation instructions. NOTE -The Commonwealth of Massachusetts stipulates these additional requirements: • Gas furnaces shall be installed by a ticensedptumber or gas fitter only. • The gas cock must be "T handle" type. • When a furnace is installed in an attic, the passageway to and service area surrounding the equipment shall be floored. These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation. In addition to the requirements outlined previously, the following general recommendations must be considered when installing a G50UH(X) furnace: • Place the furnace as close to the center of the air distribution system as possible. The furnace should also be located close to the chimney or vent termination point. • Do not install the furnace where drafts might blow directly into it. This could cause improper combustion and unsafe operation. • Do not block the furnace combustion air openings with clothing, boxes, doors, etc. Air is needed for proper combustion and safe unit operation. • When the furnace is installed in an attic or other insulated space, keep insulation away from the furnace. WARNING Page 5 Inthepast,therewasnoprobleminbringinginsufficientoutdoorairforcombustion. Infiltrationprovidedalltheairthat wasneeded.Intoday'shomes,tightconstruction practices makeit necessaryto bringin airfromoutsideforcombustion. Takeintoaccountthatexhaustfans,appliancevents, chimneys,andfireplacesforceadditionalairthatcouldbe usedforcombustionoutofthehouse.Unlessoutsideairis broughtintothehousefor combustion,negativepressure (outsidepressureisgreaterthaninsidepressure)willbuild tothepointthatadowndraftcanoccurinthefurnacevent pipeorchimney.Asaresult,gasesentertheliv combustioningspacecreatinga potentiallydangeroussituation. Intheabsenceoflocalcodesconcerningairforcombustionandventilation, usetheguidelinesandproceduresin thissectiontoinstallG50UH(X)furnacestoensureefficient andsafeoperation.Youmustconsidercombustionair needsandrequirements forexhaustventsandgaspiping. A portionof thisinformationhasbeenreprintedwithpermissionfromtheNationalFuelGasCode( ANSI-Z223.1). ThisreprintedmaterialisnotthecompleteandofficialpositionoftheANSIonthereferencedsubject, whichisrepresentedonlybythestandardin itsentirety. In Canada,referto the standardCSAB149installation codes. ACAUTION ACAUTION All gas-fired appliances require air for the combustion process. If sufficient combustion air is not available, the furnace or other appliances will operate inefficiently and unsafely. 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, exhaust fans, or clothes dryers are used at the same time as the furnace, much more air is necessary t...

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