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

Electrical 1 -Check all wiring for loose connections, 2 -Check for the correct voltage at the furnace (furnace operating). 3 -Check amp-draw on the blower motor. Motor Nameplate Actual NOTE -Do not secure the electrical conduit directly to the air ducts or structure. Blower Speeds NOTE -CFM readings are taken external to unit with a dry evaporator coil and without accessories. 1 -Turn off electrical power to furnace, 2 -Remove blower access panel. 3 -Disconnect existing speed tap at control board speed terminal. NOTE -Termination of any unused motor leads must be insulated. 4 -Refer to blower speed selection chart on unit wiring diagram for desired heating or cooling speed. 5-Connect selected speed tap at control board speed terminal. 6 -Resecure blower access panel. 7 -Turn on electrical power to furnace, Electronic Ignition The SureLight @integrated control has an added feature of an internal Watchguard control, The feature serves as an automatic reset device for ignition control lockout caused by ignition failure, After one hour of continuous thermostat demand for heat, the Watchguard will break and remake thermostat demand to the furnace and automatically reset the control to begin the ignition sequence, Page 27 FlueAndChimney 1-andallconnections Checkfluepipe,chimneyfortightnessandtomakesurethereisnoblockage, 2-Checkunitforproperdraft, 3-Ispressureswitchclosed?Obstructedfluewillcause unittoshutoffatpressureswitch,Checkflueandoutlet forblockages. 4-Resetmanualflamerolloutswitcheson burnerbox cover. FailureToOperate Iftheunitfailstooperate,checkthefollowing: 1-Isthethermostatcallingforheat? 2 -Areaccesspanelssecurelyinplace? 3-Isthemaindisconnectswitchclosed? 4 -Istherea blownfuse? 5-Isthefilterdirtyorplugged?Dirtyorpluggedfilterswill causethelimitcontroltoshuttheunitoff. 6 -Isgasturnedon atthemeter? 7-Isthemanualmainshut-offvalveopen? 8-Istheinternalmanualshut-offvalveopen? 9-Istheunitignitionsysteminlockout?Iftheunitlocksout again,calltheservicetechniciantoinspecttheunitfor blockages. ,AWARNING A,CAUTION At the beginning of each heating season, a qualified technician should check the system as follows: Blower Check the blower wheel for debris and clean if necessary. The blower motors are prelubricated for extended bearing life. No further lubrication is needed. ,&WARNING Filters All G50UH(X) filters are installed external to the unit. Filters should be inspected monthly. Clean or replace the filters when necessary to ensure that the furnace operates properly. Replacement filters must be rated for high velocity airflow. Table 1 lists recommended filter sizes. Flue And Chimney Check the flue pipe, chimney and all connections for tightness and to make sure there is no blockage, Electrical 1 -Check all wiring for loose connections. 2 -Check for the correct voltage at the furnace (furnace operating), 3 -Check amp-draw on the blower motor. Motor Nameplate Actual Cleaning the Heat Exchanger and Burners NOTE -Use papers or protective covering in front of the furnace during cleaning. Cleaning the heat exchanger requires a steel spring "snake," a reversible drill and a vacuum cleaner, The steel spring snake may be constructed by purchasing a 4 ft. long by 1/4 inch diameter steel wire cable and a 1/4 inch diameter wire brush, These items are available at a hardware store. Insert wire end of brush into the open end of the spring cable. Crimp the cable around the brush so that the brush is secured and will not come off during cleaning, Attach the other end of the cable to the reversible drill to complete the tool for cleaning the heat exchanger. 1 -Turn off both electrical and gas power supplies to furnace. 2 -Remove flue pipe and top cap from the unit. Label the pressure switch wires, then disconnect them. 3 -Remove the four screws that secure the combustion air inducer. Carefully remove the combustion air inducer to avoid damaging blower gasket. If gasket is damaged, it must be replaced to prevent leakage. See figure 30. G50UH(X) BURNER & HEATEXCHANGER REMOVAL H EAT BURNER BOX ASSEMBLY FIGURE 30 Page 28 4-Removethecollectorboxlocatedbehindthecombustionairinducer. Becarefulwiththecollectorboxgasket. Ifthegasketisdamaged,it mustbereplacedto preventleakage, 5-Labelthewiresfromgasvalveandrolloutswitches, thendisconnectthem. 6-Disconnectgassupplypiping.Removefourscrewssecuringtheburnermanifoldassemblytothevestibule panelandremovetheassemblyfromtheunit, NOx INSERTS (X models only) / FIGURE 31 7-NOx units only-Remove the three screws that attach the NOx insert to the corbel at the entrance to each heat exchanger section, Carefully remove the NOx insert from each section, See figure 31. 8 -Insert the brush end of cable snake into the top of one of the heat exchanger openings, Do not force the cable into the heat exchanger. Insert the cable and operate the drill on slow speed. Move the cable in and out of the heat exchanger section three or four times or until sufficient cleaning is accomplished. Reverse drill and slowly ...

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