PB Heat 211A Btu/hr 22 cm 2 per 2000 W of total rated, Input for all appliances in the space. See

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PREINSTALLATION

i.Where communicating directly or through vertical ducts with the outdoors each opening shall have a minimum free area of 1 in2 per 4000 Btu/hr (22 cm2 per 4000 W) of total input rating for all equipment in the space. See Figure 1.4 for openings directly communicating with the outdoors or Figure 1.5 for openings connected by ducts to the outdoors.

Figure 1.4: Air Openings – All Air Directly from Outdoors

Figure 1.6: Air Openings – All Air from Outdoors through Horizontal Ducts

b.One Permanent Opening Method: Provide one permanent opening beginning within 12 inches (305 mm) of the top of the space. The opening shall communicate directly with the outdoors, communicate through a vertical or horizontal duct, or communicate with a space that freely communicates with the outdoors. The opening shall have a minimum free area of 1 in2 per 3000 Btu/hr of total rated input for all appliances in the space and not less than the sum of the cross-sectional areas of all vent connectors in the space. The gas-fired equipment shall have clearances of at least 1 inch (25 mm) from the sides and back and 6 inches (150 mm) from the front of the appliance. See Figure 1.7 for this arrangement.

Figure 1.5: Air Openings – All Air from Outdoors through Vertical Ducts

ii.Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 in2 per 2000

Btu/hr (22 cm2 per 2000 W) of total rated	Figure 1.7: Air Openings – All Air from Outdoors
input for all appliances in the space. See	through One Opening
Figure 1.6.

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Contents Series 211A Table of Contents Controls Using this ManualFollow the Piping Guidelines Special Attention BoxesCombustible Construction Clearances PreinstallationAccessibility Clearances AIR for Combustion and VentilationRequired Volume other = Required Volume fan = 15 ft21 ft Btu/hr 22 cm 2 per 2000 W of total rated Input for all appliances in the space. SeeMechanical Combustion Air Supply Chimney or VentWhere Combustion Air DuctsExterior Vents Vent SizingCombined vent breeching Boiler Setting Installation SurveyWater Quality and MAKE-UP Boiler Foundation Layout Base Assembly Assemble the BaseCrate Items Install the Pilot Burners For 211A-04 through 211A-08 OnlyBase Front and Back Panel Crates Model Overall LengthTypical Gas Manifold and Pilot Line Assembly Total Natural Gas Only Propane Gas Only Model Number PilotsBurners Place the Boiler Sections PreparationPlacing the Sections Assembling Sections on Base Hydrostatic Test the Boiler Align Sections VerticallyInstall the Flue Collector Do not tighten yetBoiler Position Pipe the Boiler Supply PipingReturn Piping Pipe the Boiler Equalizers Multiple Boiler InstallationsBoiler Header End Risers Model SizePiping Multiple Boilers, Typical, Gravity Return Systems Prepare the Parts Install the Jacket & Draft HoodApply Cleanout Cover Plates Apply Jacket END AssembliesApply Lower END Panels Apply Jacket TOP PanelsApply Plates and Labels Top Panel GG-6024 Carton Contents Sub-Assembly Part Number Quantity Jacket Assembly Sequence Carton Numbers and Locations 13C Connect GAS Piping Install GAS TrainInstall Vent and Bleed Piping Connect Pilot GAS TubingInstall GAS Supply Piping Test GAS Supply PipingPipe Length 4 Pipe 2 Pipe Specific Gravity Multiply Capacity byInstall Blowdown Valves Install Controls and TrimInstall Safety Valves Install LOW Water CUT-OFFS Install Pressure ControlsPressure Control Piping Fittings Included with Boiler Standard Float Type COntrol, Model 67PE2 Optional Float Type Pump Control/Low Water Cut-Off, Model Application of 51 Feeders Install Control Wiring Wire the BoilerConnect Supply Wiring Prepare Remaining ControlsTypical Wiring Standard Controls Low Voltage Gas Valves Typical Wiring Standard Controls 120-Volt Gas Valves Starting the Boiler Clean the Boiler Check Boiler ControlsMeter reading. Rate, Btu/Hr = F x H x Lighting Instructions Typical To Light the Boiler To Shut Down the BoilerPilot Flame Failure Operation & Maintenance Placing Boiler in Operation Pilot and Burner FlamesWeekly Maintenance Monthly MaintenanceAnnual Maintenance Daily MaintenanceTroubleshooting Service Tips Problem Possible Cause Suggested RemedyCorrect Piping Boiler Ratings & Dimensions Boiler Rating InformationBoiler Ratings & Dimensions Chart continues on Series 211A Steam Boiler DimensionsSeries 211A Steam Boiler Dimensions Repair Parts Series 211A Description Part Selection Information Stock CodeBase Front Panel Cover Plate 26 660 mm Wide Base Panel Boiler Assembly Base Assembly Page Series 211A