Lennox International Inc. G50UH-24A-045 User Manual

,1_2006 Lennox industries Inc.Dallas, Texas, USAINSTALLATIONINSTRUCTIONSG50UH(X) SeriesGAS FURNACE505,254M _ Technical8/2006 .L_._L PublicationsSupers

Removingthe Bottom PanelRemove the two screws that secure the bottom cap to thefurnace. Pivot the bottom cap down to release the bottompanel. Once the

Thisfurnacemaybeinstalledineitheranatticoracrawl-space.Eithersuspendthefurnacefromroofraftersorfloorjoists,asshowninfigure12,orinstallthefurnaceona pl

Thisunitisnotequippedwithafilteror rack.A field-pro-videdhigh-velocityfilterisrequiredfortheunittooperateproperly.Table1listsrecommendedfiltersizes.Af

Usesheetmetalshearstoremovethecutoutfromthesideofthecabinet.Usethetwoprovidedsheetmetalscrewstoinstallthecutoutonthetopcaptocovertheoriginalflueoutlet

Common Venting Using Tile-Lined Interior Masonry ChimneMINIMUM LENGTH = AS SHORT AS PRACTICAL.FOR MAXIMUM LENGTH SEE NOTE TO LEFTNOTE- Refer to provid

5 - Theentirelengthofsinglewallmetalventconnectorshallbe readilyaccessiblefor inspection,cleaning,andreplacement.6 - Singleapplianceventingconfigurati

TABLE 3Capacity of Type B Double-Wall Vents with Type B Double-Wall ConnectorsServing a Single Category I ApplianceVent and Connector Diameter - D (in

TABLE 4Capacity of Type B Double-Wall Vents with Single-Wall Metal ConnectorsServing a Single Category I ApplianceVent and Connector Diameter - D (inc

TABLE 5Vent Connector CapacityType B Double-Wall Vents with Type B Double-Wall ConnectorsServing Two or More Category I AppliancesVent and Connector D

TABLE 7Vent Connector CapacityType B Double-Wall Vents with Single-Wall Metal ConnectorsServing Two or More Category I AppliancesVent and Connector Di

1 NOTE - 60C and 60D size units that require air volumesover 1800 cfm (850 L/s) must have one of the following:1. Single side return air with transiti

Resizethecommonventingsystemto theminimumventpipesizedeterminedbyusingtheappropriatetablesinappendixG.(Theseareinthecurrentstan-dardsoftheNationalFuel

MANUALMAIN SHUT-OFFVALVE(With 1/8 in. NPTPlugged Tap Shown)GROUNDJOINTUNIONLeft Side Piping(Standard)AUTOMATICGAS VALVE(with manualshut-off valve /AUT

INTERIORMAKE-UP BOX INSTALLATIONMAKE-UPLeft side / BOX_ °FIGURE 22Refer to figure 24 for field wiring and figure 26 for schematicwiring diagram and tr

TYPICAL G50UH(X) FIELD WIRING DIAGRAMWARNING-ELECTRIC SHOCK HAZARD,CAN CAUSE INJURYOR DEATH.UNIT MUST BE GROUNDED IN ACCORDANCEWITH NATIONAL AND LOCAL

G5OUH(X) Schematic Wiring Diagram120V ADO /_ SIS BLOWER SPEED CHART L_OR SlO COMBUSTION AIR FACTORY CONNECTED SPEED TAPS MOTOR SECONDARYPROVING SWITCH

FOR YOUR SAFETY READ BEFORE LIGHTINGAWARNINGAWARNINGACAUTIONBEFORE LIGHTING smell all around the appliance area forgas, Be sure to smell next to the f

8- Honeywell VR8205 Gas Valve with ON/OFF Switch- Move gas valve switch to ON. See figure 27.Honeywell VR8205 Gas Valve with Control Knob -Turn knob o

ralgasatallaltitudesis3.5"w.c.ManifoldpressureforallunitsfueledbyL.R/propanegasat allaltitudesis10.0"w,c.Seefigures27,28and29forthelocationo

FlueAndChimney1- Checkfluepipe,chimneyandallconnectionsfortight-nessandtomakesurethereisnoblockage,2 - Checkunitforproperdraft,3- Ispressureswitchclos

4- Removethecollectorboxlocatedbehindthecombus-tionairinducer.Becarefulwiththecollectorboxgas-ket.Ifthegasketisdamaged,it mustbereplacedtopreventleaka

GasketFlueBoxGasketHeatExchangerFlueCollectorBoxAirDeflectorG50UH-48C-135,G50UH-60C-110&G50UH-60D-155UnitsOnlyFlueTransition%Flame Sensor _Flame R

ThefollowingrepairpartsareavailablethroughLennoxdealers.Whenorderingparts,includethecompletefurnacemodelnumberlistedontheCSAInternationalnameplate--Ex

SURELIGHT®CONTROLHEATING SEQUENCE OF OPERATIONNORMAL HEATING MODE ABNORMAL HEATING MODEI POWER ON ] I GAS VALVE OFF. COMBUSTION AIR INDUCER ON._'

NORMAL HEATING MODE15-SECOND COMBUSTION AIR INDUCER PREPURGE 9N T ATED BY CLOSED PRESSURE SW TCH.YES _I IGNITOR WARM-UP -- 20 SECONDS.YESI 4-SECOND TR

SURELIGHT®CONTROLCOOLINGSEQUENCEOF OPERATIONNORMALCOOLING MODE ABNORMALCOOLING MODEI POWER ON lI IGNITIONCONTROLMA,NPOWERON II CO.T O S O,A .OS ,OO.

ISURELIGHT ® CONTROLCONTINUOUS FAN SEQUENCE OF OPERATIONI!LED: SLOW FLASH RATE REMAINS IIUNCHANGED THROUGHOUT SEQUENCE.MANUAL FAN SELECTION MADE AT TH

JobNameJobLocationJobNo.CityDateStateInstallerUnitModelNo.SerialNo.HeatingSectionElectricalConnectionsTight?SupplyVoltageBlowerMotorAmps []FuelType:Na

TheG50UH(X)gasfurnaceisshippedreadyforinstalla-tionintheupfioworhorizontalposition(leftorright).Thefurnaceisshippedwiththebottompanelinplace.Thebot-to

Wheninstalled,thisfurnacemustbeelectricallygroundedaccordingtolocalcodes.Inaddition,intheUnitedStates,installationmustconformwiththecurrentNationalEle

Inthepast,therewasnoprobleminbringinginsufficientout-doorairforcombustion.Infiltrationprovidedalltheairthatwasneeded.Intoday'shomes,tightconstruc

CHIMNEYVENTEQUIPMENT IN CONFINEDSPACE ALL AIR FROM INSIDEWiTER/HEATERFURNACE 1_OPENINGS(To AdjacentRoom)I I I INOTE - Each opening shall have a free a

CHIMNEYOR GASVENT_EQUIPMENT IN CONFINED SPACEALL AIR FROM OUTSIDE(All Air Through Ventilated Attic)VENTILATION LOUVERS(Each end of attic)FURNACEINLET

Return Air -- Upflow ApplicationsReturn air can be brought in through the bottom or eitherside of the furnace installed in an upflow application. If t