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Back To Lennox Gas Furnace       Model: G12Q3-137 or G12Q3137 Lennox gas furnace
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USER'S INFORMATION G12 , G12R and G12X Series Units i i • , i GABUNIT8 RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE 502,253M 8 / 90 SuperP , edee 3188 FOR YOUR SAFETY Do not store or use gasoline or other Eflammable vapors and liquids in the Ivicinity of this or any other appliance . i . . . . FOR YO01 _ ' SAFETY WARNING WHAT TO DO IFYOU SMELL GAS : Improper InStallation , adjustment , alter . • Do not try to light any appliance . arian , service , or ma | nte _ ' tance can • Open windows . • Do not touch any electrical swite , b ; De cause Injury or property damage . Refer not use the phone In your building . to this manual . For assistance or addi - • Immediately call your gas suppl | er from tional Information , consult a qualified a neighbor's phone . Follow the gas suppller's Instructions . Installer , service agency , or the gas • If you cannot reach your gas supplier , supplier . call the fire department . , , = Litho U , S , A ,
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PARTSIDENTIFICATION UPFLOW SERIES DOWNFLOW SERIES BLOWER CONNECTION DIRECTOWER BL BLOWERAND F'R . 1T _ HEAT FAN AND CONTROL MAIN VALVE NPILOTER BUR BOX DIRECT DflIVE FILTER FIGURE 1 WARNING - Should oyerhastlng occur or the ps Inspect return sir duct to ensure duct is sealed to supply fell to shut off , shut off the manual gas valve the furnace end terminates outside the space before shutting off electrical supply . containing appliance . Inspect physical support of unit to guerentee that WARNING - Do not use this furnace if any pad has it is sound without sagging , cracks , or gaps been under water . Immediately call • qualified ser - around base and it maintains seat between base vice technician to inspect the furnace and replace arx : l sopq : x _ . any pert of the € ontrol s _ tem and any gas'control that has been under water , E - Do not obstruct aWflow to unit . Unit must receive an unobstructed flow of combustion and ventilate CAUTION - Before elf empties to perform any Nrvlce _ ng air . or maintenance , turn electrical power off to unit el unit disconnect switch . 3 - Do not store chlorine Or fluorine products near unit or introduce these products into the combustion i - IMPORTANT DIRECTIONS air . These products Pan cause furnace coffosion . 1 - Keep furnace area clear and free of combustible II - LIGHTING iNFORMATiON AND OPERATION materials , gasoline and other flammable vapors FOR YOUR SAFETY READ BEFORE LIGHTING and liquids , WARNING - If you do not follow these Instructions ax - If installed in art insulated area , furnace must be _ tly , a fire or explosion may result causing proper - kept free of Insulating material . Insulating material ty damage , personal Injury or loss of life . may be combustible . Inspect unit venting system to make sure it is in BEFORE UGHTING smellall arounOthe appliance area piece , physically sound end without holes , corro - forgas , Be sore to smelt nextto thefloor because some sion or blockage , gas is heavier thanair and will settle on the floor . Page 1 1 ¢ 19g0 Lermox Ir _ llustrlel Inc ,
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Use . only your . hand to push in or turn the gas control WHITE RODGERS 36C GAS VALVE knob . Never use tools . If Ihe knob wit1not push in or turn by hand , do not fly to repair I1 , call a qualified service tecrmicfan . Force or affempted repair may resuTtIn a fke or explosion , This unit is equipped with an automatic " gasvalve using a standing ( constant ) pilot flame or and intermittent pilot ( = E " and " X " series units ) . Standing pilot units require manual lighting of pilot flame . Intermittent pilot models have a pilot ignitor , Do NOT try to manually light the pilot on an " E " or " X " series unit . ROBERTSHAW 7000 GAS VALVE A - PlacMg Furnace In Operation Stand _ g Pltot Lighting Information Refer to lightin _ instructions sticker on blower access panel and figure 2 for gas valve identlflP . _ ticn . 1 - S'I'OPI Read the pilot safety information in pre - vious section , 2 - Sol thermostat to lowest setting . See figure 3 . P . . _ VALVE 3 - Turn off all electrical power to appliance . 4 - Remove burner access panel . HONEYWELL VRS00 GAS VALVE 5 - Push in g6s vane knob s _ ghtly and turn ck _ ckw { se _ lb 1o OFf = . See figure 5 , NOTE - Knob cannot be turned from PILOT to OFF unless knob fs de . _ ' essed . Do not force . 6 - Walt five ( 5 ) minutes to clear out any gas . If you OAS " # aL , VE smell gas , STOP ! Immediately call your gas s _ llar from • T0eighbor's phone . Follow tllegas suppl _ or's Instructions . If you do not smell gas go to next step . POSITION 7 - Remove the pilot access panel located below and behind the gas valve . HONEYWE II VBO0 GAS VALVE GASVALVE 8 - Locate pilot - - follow metal tube from gas valve . ! otis SHOWN _ ee figure 6 . The I _ tot is be _ ee _ the two b _ rnsr tit OFF POSITION tubes behind the pilot access panel . 9 - Turn knob o _ gas valve countercJoc _ vAse _ l _ to PILOT , 10 - Push in knob on gas valve all the way . and ho _ d in , Immediately light pilot . with a match . Continue to hold the gas valve knob in for about one minute FIGURE 2 after the pilot is lit , ff it goes out , repeat steps 5 through 10 . f I - Replace pilot access panel . if knob does not pop up when reJeased , stop and 12 - Turn gas valve knob counterclockwise to 41 _ immediately call your service technician or the ON . gas supplier , 13 - Replace bumeTacsess panel If pilot will not stay lit after several tries , turn the gas valve knob to OFF and call your service tech - 14 - Turn _ eH eleotdcaI pow _ " to unit , nioian or gas supplier . 15 - S _ B'mn'nostatto desk'edsetting . Pope 2
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THERMOSTATS ROBERTSHAW 7100 GAS VALVE GASVALVEKNOB8 _ IN OFF L _ ITION FIGURE 3 ROBERTSHAW 7000 GAS VALVE TYPICAL FUSEIDISCONNECT SWITCH BOX MOUNTED ON FURNACE FOR UNIT TONNECT OPERATE DISCO SWITCH MUST BF IN " Off ' POSITION POGITION WIgTE RQDGERS 36E GAS VALVE FIGURE 4 GAS VALVE LOCATION KNOB GASVALVE ) _ KNOBSHOWN O _ IN OFF " - - - - POSrllON / FIGURE 7 k _ mduent PI _ O _ xaOo . _ ormaUo . Refer to gas valve operation sticker and figure 7 for gas veJveictentifice _ ion . 1 - s'roPI Read the safety Infom _ atlonin the previous FIGURE 5 section . PILOT ASSEMBLY 2 - 8el lt _ nTx _ lat to lowest settlng . See 11gure3 . _ n 3 - Turnoff 8 _ ete _ dGal powe ( to appllance . See figu [ e 4 , PILOT BURNER _ - - _ ' _ " ' _ FU _ M _ SFI _ JOR 4 - Tills 8pl3tlol _ ' eIS equipped wi # l oft IOrtitlon ( levite which automatically lightsthe burner . Do not try to lightthe l _ umerby hand . 5 - Remove burneraccess panel . @ l 6 - TurnKnot : ) on gss valve clocl _ l _ l _ to OFF , Do FIGURE 6 not force , Page 3
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Ill - SERVICE 7 - Waltfive ( 5 ) minutetsocleaot utanygas . Ifyouthen smelgl as , STO _ IrTVllediotelycallyourgas supplier A - Servicing Filter froma nel _ s phone . Follow ( he gas supplrer's Inspect and repl _ - e furnace air filters twice annually instructions . If you do not smell gas go to ne ) dstep . ( m _ imum ) . Raceme'rended times ere before heating and cooling seasons . Taf0 _ 1 lists filter sizes . 8 - Turnknob on gasvalve counlerclockwlse41 _ to ON , SLAB FILTER 9 - Replace burneraccess panel . 10 - Turnon all electricalpower to unit . 11 - Set thermostatto deslreclsetting . 12 - if the appliance will not operate , follow _ e Instmc - lions " To Turn Off Gas To Unit " and call your service technician orgas supplier . B - To Turn Off Gas To Unit TYPE ' FILTER 1 - Set thermostatto lowest setting . FIGURE 8 2 - Turnoff all electrical POwerto unitif service is to be per / on'ned . B - Filter Replacement of Slab Type Filters In Up - flow Units 3 - Remove unit access panel . 1 - Turn off power to lurnece at unit c _ sconnect 4 - Turnknob . ongas valve clockwlseOIb 1oOFF . Do switch , See figure 4 , notforce . ' 2 - Remove filter access panel . Walt for blower to NOTE - On standing p / ; or units , the gas valve knob slop , must be depressed sl / gt _ tlyto lure to OFF . Do not 3 - Remove filter by siidJngit upand out of filter chan - torce . nel . See figure 8 . 5 - Replace unit access panel . 4 - Slide new filter up into top channel and drop into lower channel . TABLE I1MENSIONo FILTER'MEDIA D 5 - Replace filter . access panel . D _ FIIIw " TyPe Unit . & lJ flll _ 1 in . HAMMOCK RLTER ( UPFLOW MODEL ) | Qu _ mlty ) in . • In . I [ mm • ram ) Hammo _ ( 13 GfZS - 200 62 " A 2il " It'L _ lx 711 MEDIA , _ " x _ e " 11130x7111 G f 2Q _ 1 - 82 , H , tmmo = _ t [ t ) 36 " x28 " ( 914 x ? lt ) G 12Q2 / 3X - 60 G f2QOE - 62 _ 112Q3E . . 40 2,0t4a mmoek ( 1 ) 30 " x28 " ( 7 _ x 71 + ) G12Q3 _ - 2B QI2Q ; _ . 110 ; ( 312Q3E - 110 H _ mmo ¢ _ ( t _ G12Q3 / 4X - 80 ; _ 2C _ E - ; _ b ; G1204 - _ 10 • qZ " _ 26 " ( BOOx _ l _ ) G1203 - 137 : G tZ _ Q4 . 137 Hammock ( f ] , _ , = x 2S * ( l _ t x 711 G 12Q < / SX - 100 ; RAIL G 12Q5 - 137 ; G12C _ E - 75 e 12QSE - 100 , GI2COE - 137 2t31Hs _ m _ k 11 ) 4 , ? . " _ 26 " _ tos6x 71 _ G _ 204E - ' , 3 / : Gl _ QS _ - 137 P _ T _ GI2Q _ . lag 44P x _ O * 11130x7 _ 11 01f 2Q2X - 40 ; G IL : ' O2 - 5 _ G1202 - 82 ; G1202E - 40 S _ ab1 _ ) } S " x2S " ( _ x S25 ) GI202E - S $ ; O12D - 110 FIGURE 9 Q 1203E - _ . _ OIZDE - I TO Q12RO2 - f _ ; G 12 _ 0 _ - 412 ID _ x _ O _ x 1 " G f2RO2E - 66 C - Filter Replacement of Hammock Filter in Up - _ : 4 x SO8 x 2S ) 11o _ Units _ f2RQ _ - 137110 12 " x20 " x 1 " Q12RQ3E - 1 - Turn off power to furnace at unit disconnect G 12RO3 - 137 ; 16 - M20 - . q ) + 81 = b ( 2I switch . See figure 4 . ( 406 x 50 _ x 25 ) G I2RQ6 - 137 : G12RQS - 137 G _ 2RQ _ E - a _ : f6 " x _ O'x f " 2 - Remove filter access panet , Welt for O _ ower to Smb ( 2 _ G12ROIS - 1e15 ( 40e x 50 _ x 25 ) stop . Page 4
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3 - Slidehammocfkilterassembly from unit , Sea fig - ure g . 4 - Release mecrm holding tabs by sliding holding plates lenglhwise . Rotate holding plates up and remove media from hammock frame . LEFT 5 - Positionnew filter media , with cOlored side out , to hammock frame , Close holding plate and hook the holding tabs . S Et - _ LIRINO 6 - Slide . hammock fitter assembly back into unit end SPRING install access 10anal . LEFT SUPPORT 7 - Re = tore power to unil , ANGLE { Large rectangles D - Filter Service for G12R - 55 ! 82 Units MUSt Rest On Lilt support Angle 1 - Turn off power to furnace at unJt disconnect switch . See figure 4 . 2 - Remove blower access panel and right vestibule ( FRONT AND REAR ) panel . fiGURE 10 3 - Remove seoudng spring from slotted center sup - port tab and right litter rail , See figure 10 . E - Filter Service for G12R - l _ O Series U _ ts I - Turn off power to furnace at u _ it disconnect 4 - Using slotted center support tab as s handle , slide switch . Sea figure 4 , right filter s _ ghtly left to clear right filter rail . Slide 2 - Remove burner access panel and right vestJbule filter downward to the right , below filter rail and panels . around blower and remove filter from cabinet . 3 - Remove filters by _ ahing upend , , round fil _ er 5 - Remove left fitter by ilfting up end around blower guide rails . See figure 11 . and through right vestibule el : tuning . 4 - Reusabk3 foam filters supplied with GI2R - lt0 6 - Wash permanent slab filters with water end mild units can be washed with water end a mild deter - detergent . When dry , filters should be sprayed get _ . Wt _ endry , filters should be sDrayed w _ h fil - wifft filter Hendicoater before replacing . Filter ter ! 4andk : oater _ , _ eforereplacb ' , g . F _ er Han _ - Handiooater is liP products No , 418 and is avail - teaser is RP products No . 418 and is available as able as Lennox part no . P - 8 - 5069 . Lennox part no , P - 8 - 5069 . 7 - Reverse order of above steps to reinstall fillers , 5 - Reverse order of above steps to reinstall filters . Page 5
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6 - Reusable type filters supplied can be washed with G12R - 110FILTERSERVICE water end a mild detergent . When dry . filters FILTESRtJPPO _ r should be swayed with filter Handicoater before replacing . Filter Handicoater is liP products No . 418 and is available as Lennox part no . P - 8 - 5069 . 7 - Reverse order of above steps to reinstall filters . I / / PILOT FLAME ) d ' ( side View FLAME SENSOR : , { - - q FIGURE 7 FIGURE ! 1 G12R - 137 / 165 FILTER SERVICE FILTERSUppORT FIGURE 3 FILTERRACK V - PLOT AND BURNER FLAME SIDES CAUTION - Before each heating season and periodi - cally thereafter inspect burner flame to ensure proper eI _ rttlo _ . ! - Pilot F ) ame - - Pt ] o ! flame must surround the end of flame sensor for proper operation of pilot safety - FIGURE 12 circuit . F - Filter Service for G12R - 1371165 Units 2 - Burner Flame - - Start burner and allow to operate 1 - Turn off power to furnace at unit disconnect for e few minutes to establish normal burning con - switch . See figure 4 . ditions . Check burner " flame by observation . 2 - Remove blower access panel and blower com - Flame should be predominantly blue in color , partment i _ nels . strong in appearance'and should dso directly from 3 - Lift filter vertically , and drop it down through lower the burner ports in the heat exchanger . slot in litter rack side , Sea figure 12 . VI - LUBRICATION 4 - Drop filter into blower eomparlment . Turn frlter and remove . BJower Mozore - Motors are prelubrlcated and sealed 5 - Repeat for other filter . for extended life . No further lubrication is needed . Page 6
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IV - FURNACVEENTINGSYSTEMINSPECTION 3 - Replace any blown fuses or re _ t circuit breakers . AnnuaIJ ( ybefore heating season ) inspect furnace 4 - Gas valve ( s ) should be ON lot heating cycle . venting system , draft hood , vent cap , heat exchang - 5 - Air filters should not be plugged , limiting air flow . er , burners and p _ ot for corrosion , deterioratlon , or 6 - Make s _ e a _ , ie _ . oeea pane _ a ere In p _ ca , deposits of del _ ia , Re . nave any obstructions or block - IMPORTANT - This furnace is equipped with • vent age . safety shut - - oN sw _ tch . This switch locks out fur - Periodic Unit Inspection nace operation when vent is b | ocked . Contact your Lennox dealer for a periodic unit inspec - tion by a qualified mchni _ an . thle Iv _ tch shuts off fumloe , vent system must be checked by a qualified san4ca technloisn . Do Nor VI - SERVICE REMINDER attempt to place furnace into operation , CaN your Lennox dealer If the unit is Inoperative . Be - lore calling , always check the following to De sure ser - VII - PLANNED SERVICE vice is required : To keep your Lennox heating and cooling system in 1 - Be sure electrical disconn _ . ' t SWitChBS are ON . peak opiating condition year after year , contact your 2 - Check room thermostat for proper setting , Lennox dealer about a planned service program , Page 7
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