Manual 2100-502APage 10 of 15Properly operating your furnace requires certainabilities, mechanical skills and tools. If you areuncertain about your abilities or if you lack proper skillsor tools, do not proceed. Instead, contact a qualifiedinstaller, service agency or gas supplier.An automatic ignition device lights the burners. Do nottry to light manually. See Figure 2 on Page 11 for stepby step instructions.5. Possible Emergency: Main electrical circuitbreaker for furnace cannot be reset withouttripping again or new fuses continue to blow.ACTION:a. Move gas valve control knob to OFF.b. Call your local qualified service technicianor gas supplier.SECTION 5 • OPERATING YOURFURNACEAfter reading the Safety Information and Precautionsfollow Operating Instructions on front door of furnaceand instructions repeated on Page 11.SECTION 6 • PROPER MAINTENANCEOF YOUR FURNACEYou need special abilities, mechanical skills and tools tomaintain your furnace properly. If you are uncertainabout your abilities or if you lack proper skills or tools,do not try to maintain or repair your furnace yourself.Instead, contact a qualified installer, service agency orgas supplier.6.A IF YOU SMELL GAS OR ANY UNFAMILIARSMELL WHILE WORKING ON YOURFURNACE:1. Do not try to light main burners.2. Do not touch or turn on any electricalswitch.3. Do not use any phone in your building.4. Immediately call your gas supplier from aneighbor’s phone. Follow gas supplier’sinstructions.5. If you cannot reach your gas supplier, callfire department.6.B LUBRICATION REQUIREMENTSThe main blower motor, outdoor fan motor,and the induced draft blower motor arepermanently lubricated, and no maintenance isrequired.6.C MAKE SURE AIR FILTER(S) IS IN PLACEAsk your installer, local qualified servicetechnician or gas supplier to make sure yourfilter(s) is in place properly. Become familiarwith its location and procedures for removing,cleaning and replacing it.Recommended filter sizes are shown below.Main System Filter: 20x30x2 throwaway forWG3S, WG4S & WG5S models.See Figure 3 on Page 13 for filter locations.WARNINGNever use tools to move gas control knob.Only use your hand. If gas control knobwill not move by hand, do not force it or tryto repair it. Call a qualified installer,service agency or gas supplier. Forcingknob can cause gas to leak which couldresult in fire or explosion resulting indamage, injury or death.WARNINGIf you do not follow these instructionsexactly a fire or explosion could occurresulting in damage, injury or death.WARNINGOperating furnace without clean air filter(s)can damage blower motor, heat exchangeror air conditioning system components.This can cause system failure which couldresult in damage or injury.