28VENTINGThe furnace shall be connected to a listed factory built chimneyor vent, or a clay--tile lined masonry or concrete chimney. Ventinginto an unlined masonry chimney or concrete chimney isprohibited.When an existing Category I furnace is removed or replaced, theoriginal venting system may no longer be sized to properly ventthe attached appliances. An improperly sized Category I ventingsystem could cause the formation of condensate in the furnaceand vent, leakage of condensate and combustion products, andspillage of combustion products into the living space.CARBON MONOXIDE POISONING HAZARDFailure to follow the steps outlined below for eachappliance connected to the venting system being placed intooperation could result in carbon monoxide poisoning ordeath. The following steps shall be followed for eachappliance connected to the venting system being placed intooperation, while all other appliances connected to theventing system are not in operation:1. Seal any unused openings in venting system.2. Inspect the venting system for proper size andhorizontal pitch, as required in the National Fuel GasCode, ANSI Z223.1/NFPA 54 and theseinstructions. Determine that there is no blockage orrestriction, leakage, corrosion and other deficiencies,which could cause an unsafe condition.3. As far as practical, close all building doors andwindows and all doors between the space in whichthe appliance(s) connected to the venting system arelocated and other spaces of the building.4. Close fireplace dampers.5. Turn on clothes dryers and any appliance notconnected to the venting system. Turn on anyexhaust fans, such as range hoods and bathroomexhausts, so they are operating at maximum speed.Do not operate a summer exhaust fan.6. Follow the lighting instructions. Place the appliancebeing inspected into operation. Adjust the thermostatso appliance is operating continuously.7. Test for spillage from draft hood equippedappliances at the draft hood relief opening after 5minutes of main burner operation. Use the flame of amatch or candle.8. If improper venting is observed during any of theabove tests, the venting system must be corrected inaccordance with the National Fuel Gas Code, ANSIZ223.1/NFPA 54.9. After it has been determined that each applianceconnected to the venting system properly vents whentested as outlined above, return doors, windows,exhaust fans, fireplace dampers and any othergas--fired burning appliance to their previousconditions of use.! WARNINGVent system or vent connectors may need to be resized. Ventsystems or vent connectors, must be sized to approach minimumsize as determined using appropriate table found in the NFGC.GENERAL VENTING REQUIREMENTSFollow all safety codes for proper vent sizing and installationrequirements, including local building codes, the National FuelGas Code ANSI Z223.1--2009/NFPA 54--2009 (NFGC), Parts 12and 13 in the United States, the local building codes, and furnaceand vent manufacturers’ instructions.These furnaces are design--certified as Category I furnaces inaccordance with ANSI Z21.47--2006/CSA 2.3--2006 and operatewith a non--positive vent static pressure to minimize the potentialfor vent gas leakage. Category I furnaces operate with a flue lossnot less than 17 percent to minimize the potential forcondensation in the venting system. These furnaces are approvedfor common venting and multistory venting with other fanassisted or draft hood equipped appliances in accordance with theNFGC, the local building codes, and furnace and ventmanufacturers’ instructions. The following information andwarning must be considered in addition to the requirementsdefined in the NFGC.1. If a vent (common or dedicated) becomes blocked, the fur-nace will be shut off by the draft safeguard switch locatedon the vent elbow.2. Do not vent this Category I furnace into a single--wall ded-icated or common vent. The dedicated or common vent isconsidered to be the vertical portion of the vent systemthat terminates outdoors.3. Vent connectors serving Category I furnaces shall not beconnected into any portion of a mechanical draft systemoperating under positive pressure.4. Do not vent this appliance with any solid fuel burning ap-pliance.5. Category I furnaces must be vented vertically or nearlyvertically unless equipped with a listed power ventor.6. Do not vent this appliance into an unlined masonry chim-ney. Refer to Chimney Inspection Chart, Fig. 33.Masonry Chimney RequirementsNOTE: These furnaces are CSA design--certified for use inexterior tile--lined masonry chimneys with a factory accessoryChimney Adapter Kit. Refer to the furnace rating plate for correctkit usage. The Chimney Adapter Kits are for use with ONLYfurnaces having a Chimney Adapter Kit numbers marked on thefurnace rating plate.If a clay tile--lined masonry chimney is being used and it isexposed to the outdoors below the roof line, relining might berequired. Chimneys shall conform to the Standard for Chimneys,Fireplaces, Vents, and Solid Fuel Burning AppliancesANSI/NFPA 211--2009 in the United States and must be in goodcondition.U.S.A.--Refer to Sections 13.1.8 and 13.2.20 of the NFPA54/ANSI Z223.1--2009 or the authority having jurisdiction todetermine whether relining is required. If relining is required, usea properly sized listed metal liner, Type--B vent, or a listedalternative venting design.NOTE: See the NFGC NFPA 54/ANSI Z223.1--2009 , 13.1.8and 13.2.20 regarding alternative venting design and theException, which cover installations such as the ChimneyAdapter Kits which are listed for use with these furnaces.The Chimney Adapter Kit is listed alternative venting system forthese furnaces. See the kit instructions for complete details. SeeTable 16 for accessory listing.58DL