Raypak Hi Delta 992B-1262B Installation & Operating Instructions Manual

Also see for HI DELTA 1262B: Specification sheet Installation & operating instructions Specifications Installation & operating instructions Brochure & specs

47Horizontal Through-the-Wall Venting(Category IV)WARNING: Vent connectors serving appliancesvented by natural draft shall not be connected intoany portion of mechanical draft systems operatingunder a positive pressure.Fig. 42: Horizontal Through-the-Wall Venting(Category IV)InstallationThese installations utilize the boiler-mounted blower tovent the combustion products to the outdoors.Combustion air is taken from inside the room and thevent is installed horizontally through the wall to the out-doors. Adequate combustion and ventilation air mustbe supplied to the mechanical room in accordancewith the NFGC (U.S.) and B149 (Canada).The total length of the horizontal through-the-wall ex-haust vent system should not exceed 70 ft in length. Ifhorizontal run exceeds 70 ft, an appropriately sizedextractor must be used. To maintain proper operation,Air InletMax. Length*ModelCertifiedVentingMaterialVent SizeMaximumEquivalentVent Length*Combustion AirIntake PipeMaterial 10” 12”992BE 10”1262BE1532BE 12” 75’ 100’1802BE2002BE2072BE14”2342BECategory IIor IV16”70’Room Air40’DuctedCombustionAirGalvanized Steel,PVC,ABS,CPVC 40’ 75’pressure reading must be between -0.01 and -0.1 in.WC as measured 12 in. from the appliance flue outlet.Each elbow used is equal to 10 ft of straight pipe. Thiswill allow installation in one of the four following com-binations:• 70’ of straight flue pipe• 60’ of straight flue pipe and one elbow• 50’ of straight flue pipe and two elbows• 40’ of straight pipe and three elbowsThe vent cap is not considered in the overall length ofthe venting system.The vent must be installed to prevent flue gas leakage.Care must be taken during assembly to ensure that alljoints are sealed properly and are airtight. The ventmust be installed to prevent the potential accumulationof condensate in the vent pipes. It is recommendedthat:1. The vent must be installed with a slight upwardslope of not more than 1/4 in per foot of horizontalrun to the vent terminal.2. The vent must be insulated through the length ofthe horizontal run.Common Venting SystemCommon venting of Category IV systems is not al-lowed.WARNING: No substitutions of flue pipe or ventcap material are allowed. Such substitutions wouldjeopardize the safety and health of inhabitants.Table Q: Category II and IV Venting* Subtract 10 ft per elbow. Max. 3 elbows.Maximum combustion air duct length terminated at 100 equivalent ft.*Requires optional vent tee.