IBC SL 35-199 Operating Instructions Manual

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IBC SL 35-199 Operating Instructions Manual Manual pdf 19 page image

1-13INSTALLATIONSL 35-199, SL 45-260 MODULATING GAS BOILERS1.4.8 “Indoor Air” Combustion Air IntakeAn “Indoor Combustion Air installation”, as described herein, is one in which airfor combustion is taken from the ambient air around the boiler.To support combustion, an ample air supply is required. This may requiredirect openings in the boiler room to the outside. If the boiler is not in a roomadjacent to an outside wall, air may be ducted from outside wall openings.Provisions for combustion and ventilation air must be made as follows:• in the USA, in accordance with the National Fuel Gas Code, ANSI Z223.1(latest edition), or applicable provisions of the local building codes• in Canada, in compliance with B149.1-101.4.9 Combustion Air FiltrationIf combustion air contamination from ingested particulate matter may be aconcern in any installation, an optional air intake filter may be installed. IBCsupplied air intake filters have a known pressure drop and fouling factor andshould be used as a component of the combustion air system according to theallowable intake length in Table 4.1.4.10 Closet InstallationsFor installations in a confined space (such as a closet), ventilation openings maybe needed through a door or wall to prevent excessive heat from building upinside the space.The boiler shall not be exposed to ambient conditions above 122°F (50°C) orbelow 32°F (0°C).NOTECombustion fanblockages can occur whenenvironmental particulate andforeign matter contaminants(leaves, dust, dandelion &cottonwood fluff, etc) aredrawn into the air intake. Inareas where this problem issuspected to be an issue,our optional air intake filtershould be installed.Filters should be checkedand cleaned or replaced ona regular schedule based onthe severity of the problem.Figure 14: Direct vent - intake, exhaust system with optional air intake filter (filtration mayalso be used on indoor air applications as required)P172A Filter assembly