Forproperventingin certaininstallations,largerdiameter ventpipemaybenecessary,ConsultyourlocalSearsService Centerorgassupplierto aidyouindeterminingtheproper ventingforyourwaterheaterfromtheventtablesinthecurrent editionoftheNationalFuelGasCodeANStZ223,1/NFPA54,
Periodicallychecktheventingsystemforsignsofobstruction ordeteriorationandreplaceifneeded,
Thecombustionandventilationairflowmustnotbeobstructed,
Thewaterheaterwithdrafthoodinstalledmustbeconnected
toa chimneyorlistedventpipesystem,whichterminatesto theoutdoors,Neveroperatethewaterheaterunlessitisvented totheoutdoorsandhasadequateairsupplytoavoidrisksof improperoperation,explosionorasphyxiation,
Forproperdrafthoodattachment,thedrafthoodlegsmay
beangledslightlyinward,
Placethedrafthoodlegsinthereceivingholesonthetopof thewaterheaterThelegswillsnapintheholestogivea. tightfit.Securetwolegstotopwithsheetmetalscrews,
Placetheventpipeoverthedrafthood,Withtheventpipein
position,drillasmallholethroughboththeventpipeand
drafthood,Securethemtogetherwithasheetmetalscrew,
seeFigure17.
DRAFT HOOD | _V | VENT | $ |
DRAFT HOOD
All vent gases must be completely vented to the outdoors of the structure (dwelling), Install only the draft hood provided with the new water heater and no other draft hoed.
Vent pipes must be secured at each joint with sheet metal screws,
There must be a minimum of 6 inches (153 mm) clearance between single wall vent pipe and any combustible material. Fill and seal any clearance between single wall vent pipe and
combustible material with mortar mix, cement, or other noncombustible substance, For other than single wall, follow vent pipe manufacturer's clearance specifications, To insure a tight fit of the vent pipe in a brick chimney, seal around the vent pipe with mortar mix cement,
Failure to have required clearances between vent piping and combustible material will result in a fire hazard,
Be sure vent pipe is propedy connected to prevent escape of dangerous flue gases which could cause deadly asphyxiation.
•Flue gases may escape if vent p_peis not connected
•Do not store corrosive chemicals in vicini_ of water heater,
•Chemical corrosion of flue and vent system can cause serious injuryor death.
•Contact a qualified installer or service agency
Breathing carbon monoxide can cause brain damage ordeath Always read and understand instruction manual.
VENT TO OUTDOORS
INEY
OP,AFT HOOD
Chemical vapor corrosion of the flue and vent system may occur if air for combustion contains certain chemical vapors. Spray can propellants, cleaning solvents, refrigerator and air conditioner refrigerants, swimming pool chemicals, calcium and sodium chloride, waxes, bleach and process chemicals are typical compounds which are potentially corrosive.
FIGURE17.
Obstructed or deteriorated vent systems may present serious health risk or asphyxiation.
Gas Piping
The vent pipe from the water heater must be no less than the diameter of the draft hood outlet on the water heater and must
slope upward at least 1/4 inch per linear foot (21 mm per meter), see Figure 18,
CHfMNEY
FIGURE18.
Fire and Explosion Hazard
•Do not use water heater with any gas other than the gas shown on the rating plate
, E×cessve pressure to gas control valve can cause serious
injury or death
,Turn off gas lines during installation
,Contact qualified installer or service agency
15
