Laars JVS Installation And Operation Instructions Manual

Laars JVS Installation And Operation Instructions Manual Manual pdf 7 page image

Mini-Therm II Hydronic Boiler Page 7SECTION 3.Venting3.1 Combustion Air SupplyThe boiler location must provide sufficientair supply for proper combustion, and ventilationof the surrounding area as outlined in the latestedition of ANSI standard Z223.1 or in Canada,CSA-B149.1, and any local codes that may beapplicable.In general, these requirements specify that boilerrooms which represent confined spaces should beprovided with two permanent air supply openings; onewithin 12 inches (305mm) of the ceiling, the otherwithin 12 inches (305mm) of the floor (see Table 2).Inside Air Supply: When combustion issupplied from inside the building, each openingshould have a minimum free area of one square inchper 1,000 BTU/h (0.3kW) input of the total inputrating of all appliances in the enclosed area. Theseopenings should never be less than 100 square inches(645 sq. cm).Note: In Canada, follow Canadian Standard, CSA-B149.1 or local codes.Exhaust Fans or Vents: Any equipment whichexhausts air from the boiler room can deplete thecombustion air supply or reverse the natural draftaction of the venting system. This could cause flueproducts to accumulate in the boiler room. Additionalair must be supplied to compensate for such exhaust.The information in Table 2 is not applicable ininstallations where exhaust fans or blowers of anytype are used. Such installations must be designed byqualified engineers.If a blower or fan is used to supply air to theboiler room, the installer should make sure it does notcreate drafts which could cause nuisance shutdowns ofthe pilot. If a blower is necessary to provide adequatecombustion air to the boiler, a suitable switch orequivalent must be wired into the boiler control circuitto prevent the boiler from firing unless the blower isoperating.The boiler must be completely isolated andprotected from any source of corrosive chemicalfumes such as those emitted by trichlorethylene,perchlorethylene, chlorine, etc.WARNINGDo not store any chemical, cleaners, or othercorrosive material near combustion air openings orin the room. Avoid locating dryer vents in the vicinityof combustion air openings. Failure to preventcorrosive materials from mixing with combustion aircan result in reduced boiler life and unsafe boileroperation.AVERTISSEMENTN’entrepposer aucun produit chimique, produitnettoyant ou produit corrosif à proximité desbouches d’air de combustion ou dans la pièce.Éviter de placer des tuyaux de ventilation poursécheuse à proximité des bouches d’air decombustion. Le fait de laisser des maitièrescorrosives se mélanger à l’air de combustion risquede réduire le cycle de vie de l’appareil de chauffageet de compromettre son fonctionnement.3.2 Exhaust VentingVent piping must be of the same or largerdiameter as the vent damper or draft diverter outlet.The only correct procedure for vent pipe sizing is todo so in accordance with Table 3 and the applicableinstallation code as stated in the following warning.Boiler Size Outside AirArea in Sq. In.*Inside AirArea in Sq. In.* (sq cm)50 15 97 100 64575 20 129 100 645100 25 161 100 645125 32 206 125 807160 40 258 160 1032225 60 387 225 1452*Area indicated is for one of two openings; one at floor level andone at the ceiling, so the total net free area would be double thefigures indicated. For special conditions, refer to NFPA54 ANSIZ223.1. In Canada refer to the National Standard CSA B149.1which differs from this table.NOTE: Check with louver manufacturers for Net Free Area oflouvers. Correct for screen resistance to the Net Free Area if ascreen is installed. Check all local codes applicable tocombustion air.Table 2. Minimum RecommendedAir Supply to Boiler Room.Outside Air Area*Sq. In. sq cmInside Air Area*Sq. In. sq cmImportant: See gas piping selection chart, Table 3 forgas line sizing. In all cases, pipe size is larger thaninlet connection on heater. Run pipe size shown inchart and reduce at heater inlet.Outside Air Supply: When combustion air issupplied directly through an outside wall, each openingshould have a minimum free area of one square inch per4,000 BTU/h (1.2kW) input of the total input rating ofall appliances in the enclosed area.If air is provided through horizontal ducts,each opening and duct must provide one square inchof flow area for each 2000 BTU/h (0.6 kW). Theserequirements are summarized in Table 2. Note thatthe required size of openings shall be based on thenet free area of each opening. Where the free areaof louver or grille is known it shall be used incalculating the effective free area. Where the freearea are not known, it shall be assumed that woodlouvers will have 25 percent free area, and metallouvers and grilles will have 75 percent free area.