Raypak 122-322 manual Natural Draft Vertical Venting System Installation

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Natural Draft Vertical Venting System Installation

Natural draft venting uses the natural buoyancy of the heated flue products to create a thermal driving head that expels the exhaust gases from the flue. The neg- ative draft must be within the range of -.01 in. to -.08 in. WC as measured 12 in. from the appliance flue out- let to ensure proper operation. Vent material must be listed by a nationally recognized test agency.

The maximum and minimum venting length for Category I appliance shall be determined per the lat- est edition of the NFGC (U.S.) or B149 Installation Code (Canada).

The diameter of vent flue pipe should be sized accord- ing to Part 11 of the latest edition of the NFGC (U.S.) and part 7 and appendix B of the B149 Installation Code (Canada). The minimum flue pipe diameter for conventional negative draft venting using double-wall B type vent is 4” for 122, 5” for 162, 202 and 242, 6” for 322.

NOTE: Vent Adapter will have to be used to connect B vent to the unit.

The connection from the appliance vent to the stack must be as direct as possible and shall be the same diameter as, or larger than the vent outlet. The hori- zontal breaching of a vent must have an upward slope of not less than 1/4 inch per linear foot from the heater to the vent terminal. The horizontal portions of the vent shall also be supported for the design and weight of the material employed to maintain clearances and to prevent physical damage or separation of joints.

Natural Draft Vertical Vent

Termination

The vent terminal should be vertical and should termi- nate outside the building at least two (2) feet above the highest point of the roof that is within 10 feet. The vent cap should have a minimum clearance of four (4) feet horizontally from and in no case above or below (unless a four (4) foot horizontal distance is main- tained) electric meters, gas meters, regulators and relief equipment. The distance of the vent terminal from adjacent public walkways, adjacent buildings, open windows and building openings must be consis- tent with the NFGC, or in Canada, the B149 Installation Code for Gas Burning Appliances and Equipment. Gas vents supported only by flashing and extended above the roof more than five feet should be securely guyed or braced to withstand snow and wind loads.

CAUTION: Listed vent cap terminal must be used and sized adequately to evacuate the flue products from the heaters.

Natural Draft Vertical Venting with Common Venting System, Category I Appliance Only

Manifolds that connect more than one heater to a com- mon chimney must be sized to handle the combined load. Consult available guides for proper sizing of the manifold and the chimney. At no time should the area of the vent be less than the area of the largest heater exhaust outlet.

WARNING: Vent connectors serving appliances vented by natural draft shall not be connected into any portion of mechanical draft systems operating under a positive pressure.

CAUTION: Vent connectors for natural draft venting systems must be type “B” vent or better.

Common venting systems may be too large when an existing unit is removed. At the time of removal of an existing appliance, the following steps must be fol- lowed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining connected to the common venting system are not in operation.

a)Seal any unused opening in the common venting system.

b)Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion or other unsafe condition.

c)Insofar as is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected to the com- mon venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the common vent sys- tem. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will oper- ate at maximum speed. Do not operate summer exhaust fan. Close fireplace dampers.

d)Place in operation the appliances being inspected. Follow the manufacturers instructions for lighting

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Contents Installation & Operating Instructions Page Contents Are important but not related to personal injury hazards Product Receipt Before InstallationInstallations at Elevation Model IdentificationComponent Locations Component Locations-BackModel Burners per Valve Stages Fire at Stage General InformationModel Quantity Vent Size Burners Gas Valves Blowers Flue Water Time to Produce Serious Temp Burn General SafetyTime/Temperature Relationships in Scalds Indoor Installations InstallationInstallation Codes Equipment BaseOutdoor Installations Heater Min. Clearance Recommended From CombustibleConventional Combustion Air Supply InstallationsCombustion and Ventilation Air Indoor UnitsGeneral Canadian InstallationsWater Piping Relief Valve PipingHydronic Heating Dual Boiler-Primary/Secondary Piping Air-Separation/Expansion Tank Domestic Hot Water PipingPiping-Heating Boilers Three-Way ValvesSingle Heater-Domestic Hot Water with One Storage Tank Automatic Chlorinators and Chemical Feeders Pool HeatingGas Supply Winterizing Your HeaterGas Supply Connection Gas Supply Pressure Gas Pressure RegulatorSurge Protection Electrical Power ConnectionsCheck the Power Source Making the Electrical ConnectionsElectrical Connections-Domestic Hot Water Single Stage and 2-Stage TankstatVenting Definition of Appliance CategoriesVent Terminal Location Barometric DamperSupport of Vent Stack Table I Vent/Air Inlet Termination Clearances US Installations Canada InstallationsVenting Installation Tips Venting ConfigurationsNatural Draft Vertical Venting System Installation Natural Draft Vertical Vent TerminationModel Appliance Certified Vent Size Max. Venting Category Inches Length feetHorizontal Thru-wall Direct Vent Termination Category Inches Length Certified Max Combustion Air Inlet Max. AirVenting Air Intake FeetHorizontal Thru-wall Direct Vent Termination Category Inches Min./Max Combustion Max. Air CertifiedVenting Height InchesVertical Direct Vent Termination Outdoor InstallationVertical Direct Vent System Installation Ignition Control Module High Limit Manual ResetControls Flow Switch Low Water Cut Off OptionalWiring DIAGRAM-MODELS PRE-START-UP Initial START-UPStart-Up Main Burner AdjustmentSafety Inspection Follow-Up Post START-UP CheckOperation Operating InstructionsTo Turn Off Gas To Appliance MaintenanceSuggested Minimum Maintenance Schedule Yearly Beginning of each heating seasonMonthly AppendixInside Combustion Air Contamination QuarterlyCorporate Headquarters Page
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122-322 specifications

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