Raypak 751 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 0.01 in. to 0.08 in. WC negative to ensure proper operation. The vent material must be in accordance with the above instruc- tions for vent materials. 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 National Fuel Gas Code (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 National Fuel Gas Code (U.S.) and part 7 and appendix B of the CSA B149 Installation Code (Canada). The flue pipe diameter for conventional negative draft venting using double-wall B type vent is 8” for the ADB 751, 10” for the 1001, and 12” for the ADB 1501.

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 vent must be installed to prevent accumulation of condensate and, where necessary, have means provided for drainage of condensate. The horizontal breaching of a vent must have an upward slope of not less than 1/4 inch per linear foot from the boiler 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 consistent with the National Fuel Gas Code, or in Canada, the latest edition of the CSA 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 with- stand snow and wind loads.

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

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

(NOT to be Utilized with Add-on Condensing Heat Exchanger)

Manifolds that connect more than one boiler 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 boiler 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

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Contents Advanced Design Boiler Page Contents Pay Attention to These Terms Installations at Elevation Before InstallationProduct Receipt Model IdentificationComponent Locations Component LocationsTime/Temperature Relationships in Scalds General SafetyInstallation Codes InstallationIndoor Installations Equipment BaseCombustion and Ventilation Air Outdoor InstallationsIndoor Units Direct VentInstallations1 Canadian Installations2 Conventional Combustion Air Supply InstallationsCanadian Installations Temperature & Pressure Gauge Low Temperature SystemWater Piping GeneralHydronic Heating Single Boiler Primary/Secondary Piping Dual Boiler Piping Domestic HOT Water Piping Single Boiler Domestic Hot Water with One Storage Tank Page Automatic Chlorinators and Chemical Feeders Pool HeatingWinterizing Your Heater Pool and Spa Water ChemistrySingle Boiler Pool Application Double Boiler Pool Application GAS Supply ConnectionsGas Supply Pressure Gas Supply ConnectionElectrical Power Connections Electrical Connections Domestic Hot Water Field Wiring ConnectionsGeneral Definition of Appliance Categories Venting ConnectionsVent Terminal Location Venting Configurations Venting Installation TipsADB-1501 Natural Draft Vertical Vent Termination Natural Draft Vertical Venting System InstallationADB-1501 Horizontal Thru-Wall Direct Venting/Combustion Air Category Horizontal Thru-wall Direct Vent TerminationÁDB-1501 Vertical Direct Venting/Combustion Air Category Vertical Direct Vent Termination Vertical Direct Venting System InstallationContact the manufacturer for details Horizontal Thru-wall Venting System Category IV Installation PVC, ABS Page Galvanized ADB-751 Venting Material e.g Subtract 10 ft per Condensate Trap Alignment Condensate DrainCPW Board Central Point Wiring CPWControls Freeze Protection Feature Pump Turn-off DelayBlower Fan Pre-purge Blower Fan Post-purgeLight Color Indication Diagnostics BoardFigure L-2 Wiring DiagramHigh Limit Manual Reset Flow SwitchHigh Limit Auto Reset Ignition Control ModulePRE-START-UP High and Low Gas Pressure Switches Manual ResetLow Water Cut Off Optional Fill the SystemBlower T Fitting Detail Pre-Start-up CheckPreparation for Start-up ADB Initial START-UPTools Needed Page Safety Inspection Main Burner AdjustmentPost START-UP Check Follow-upSuggested Minimum Maintenance Schedule MaintenanceOperation Operating InstructionsCleaning Boiler Heating Surfaces Connecting the Condensing Heat Exchanger CHXDaily MonthlyConnecting Add-on Condensing Heat Exchanger to ADB Vent Switch AdjustmentInside Combustion Air Contamination AppendixEmissions Settings and Test Information Bluff Head Body Burner Warranty

751 specifications

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