Raypak Hi Delta 302A-902A Installation And Operating Instructions Manual

285. Remove the screws, retaining ring and rain gasketfrom top of heater.6. Remove the screws, flue collar and gasket fromthe run side of the tee located in the flue box ontop of the heater.7. Reverse the components and reattach in the newlocation.8. Make sure that the stainless steel cover, now lo-cated on the run side of the tee, is sealed to avoidany flue gas spillage.Venting Installation TipsSupport piping:• horizontal runs - at least every 5 ft• vertical runs - use braces• under or near elbowsVenting ConfigurationsFor heaters connected to gas vents or chimneys, ventinstallations shall be in accordance with the NFGC(U.S.), or B149.1 (Canada), or applicable provisions oflocal building codes.Natural Draft Vertical Venting(Category I)InstallationNatural draft venting uses the natural buoyancy of theheated flue products to create a thermal driving headthat expels the exhaust gases from the flue. The nega-tive draft must be within the range of -.01 to -.08 in.WC as measured 12 in. above the appliance flue out-let to ensure proper operation. Vent material must belisted by a nationally recognized test agency.CAUTION: The silicone vent gaskets must be prop-erly reinstalled to prevent flue gas leakage. Replaceany torn or worn vent gaskets.WARNING: Examine the venting system at leastonce a year. Check all joints and vent pipe connec-tions for tightness, corrosion or deterioration.The maximum and minimum venting length for Cate-gory I appliances shall be determined per the NFGC(U.S.) or B149.1 (Canada).The diameter of vent flue pipe should be sized accord-ing to the NFGC (U.S.) and B149.1 (Canada). Theminimum flue pipe diameter for conventional negativedraft venting using double-wall Type B vent is: 5 in. forModel 302A, 6 in. for Models 402A and 502A, and 8 in.for Models 652A, 752A and 902A.The connection from the appliance vent to the stackmust be as direct as possible and shall be the same di-ameter as, or larger than, the vent outlet. The horizon-tal breaching of a vent must have an upward slope ofnot less than 1/4 inch per linear foot from the heater tothe vent terminal. The horizontal portions of the ventshall also be supported for the design and weight ofthe material employed to maintain clearances and toprevent physical damage or separation of joints.NOTE: A vent adapter (field-supplied) must be usedto connect Type B vent to the unit.Fig. 24: Natural Draft Vertical Venting(Category I)