A.O. Smith 2000 Confined Space Outdoor AIR Through TWO Openings, Outdoor AIR Through ONE Opening

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CONFINED SPACE

 

OUTDOOR AIR THROUGH TWO OPENINGS

A confined space is one whose volume is less than 50 cubic feet per 1,000 Btu/hr (4.8 cubic meters per kW) of the total input rating of all appliances installed in the space.

Openings must be installed to provide fresh air for combustion, ventilation and dilution in confined spaces. The required size for the openings is dependent on the method used to provide fresh air to the confined space and the total Btu/hr input rating of all appliances installed in the space.

DIRECT VENT APPLIANCES

Appliances installed in a direct vent configuration that derive all air for combustion from the outdoor atmosphere through sealed intake air piping are not factored in the total appliance input Btu/ hr calculations used to determine the size of openings providing fresh air into confined spaces.

EXHAUST FANS

Where exhaust fans are installed, additional air shall be provided to replace the exhausted air. When an exhaust fan is installed in the same space with a water heater, sufficient openings to provide fresh air must be provided that accommodate the requirements for all appliances in the room and the exhaust fan. Undersized openings will cause air to be drawn into the room through the water heater’s vent system causing poor combustion. Sooting, serious damage to the water heater and the risk of fire or explosion may result. It can also create a risk of asphyxiation.

LOUVERS AND GRILLES

The free areas of the fresh air openings in the instructions that follow do not take in to account the presence of louvers, grilles or screens in the openings.

The required size of openings for combustion, ventilation and dilution air shall be based on the “net free area” of each opening. Where the free area through a design of louver or grille or screen is known, it shall be used in calculating the size of opening required to provide the free area specified. Where the louver and grille design and free area are not known, it shall be assumed that wood louvers will have 25% free area and metal louvers and grilles will have 75% free area. Non motorized louvers and grilles shall be fixed in the open position.

FRESH AIR OPENINGS FOR CONFINED SPACES

The following instructions shall be used to calculate the size, number and placement of openings providing fresh air for combustion, ventilation and dilution in confined spaces. The illustrations shown in this section of the manual are a reference for the openings that provide fresh air into confined spaces only. Do not refer to these illustrations for the purpose of vent installation. See Venting section on Page 25 for complete venting installation instructions.

Figure 17.  OUTDOOR AIR THROUGH TWO OPENINGS

The confined space shall be provided with two permanent openings, one commencing within 12 inches (300 mm) of the top and one commencing within 12 inches (300 mm) of the bottom of the enclosure. The openings shall communicate directly with the outdoors. See Figure 17.

Each opening shall have a minimum free area of 1 square inch per 4,000 Btu/hr (550 mm2 per kW) of the aggregate input rating of all appliances installed in the enclosure. Each opening shall not be less than 100 square inches (645 cm2).

OUTDOOR AIR THROUGH ONE OPENING

Figure 18.  OUTDOOR AIR THROUGH ONE OPENING

Alternatively a single permanent opening, commencing within 12 inches (300 mm) of the top of the enclosure, shall be provided. See Figure 18. The water heater 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. The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces that freely communicate with the outdoors and shall have a minimum free area of the following:

1.1 square inch per 3000 Btu/hr (700 mm2 per kW) of the total input rating of all appliances located in the enclosure, and

2.Not less than the sum of the areas of all vent connectors in the space.

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Contents XP Boiler Table of Contents Important Definitions Safe INSTALLATION, USE and ServiceApprovals General Safety Qualifications IntroductionModel Identification Abbreviations UsedOperating Characteristics Dimensions and Capacity DataDouble Heat Exchanger Boiler Rough in Dimensions Double Electrical Requirements RatingsXB Models FLOW, Head and Temperature Rise FLOW, Head and Temperature RiseSingle Heat Exchanger Boiler Components Features and ComponentsDouble Heat Exchanger Boiler Components Low water cutoff board and sensor probe Lwco Component DescriptionControl Components LOW Water Cutoff Device Lwco Flame Sensor Water Temperature SensorsWater Temperature Limit Controls Main Power Supply SwitchHydronic System Boiler Installation ConsiderationsGeneral Thermal Expansion Internal ContaminantsHOT Water Boiler System General Water Line Connections Closed Water SystemsGAS Connections Explosion HazardGAS Supply Line Sizing Corrosive Materials and Contamination SourcesLOW Voltage Control Wiring Field WiringVAC Power Supply Wiring Power Supply CheckSuggested Pipe Size for Multiple GAS Appliances Natural GAS Replacing Existing Common Vented Boiler General RequirementsRequired Ability LocationLeveling Installation ClearancesPanels and Covers Chemical Vapor CorrosionOutdoor AIR Through ONE Opening Confined Space Outdoor AIR Through TWO OpeningsFresh AIR Openings for Confined Spaces Ducts Outdoor AIR Through TWO Horizontal DuctsOutdoor AIR Through TWO Vertical Ducts AIR from Other Indoor SpacesVenting AIR Inlet Pipe Materials Vent and AIR Pipe InstallationRequirements for Installation in Canada Venting Supports Vertical Installation RequirementsHorizontal Installation Requirements Direct Vent Installation RequirementsModels Vent KIT Numbers XB/XW TEE Models Vent KIT Numbers XB/XW Rain CAPModels Vent AIR Intake XB/XW KIT Numbers Rain CAP Elbow Models Vent AIR Intake XB/XW KIT Numbers TEE ElbowDirect VENT, Vertical Vent Horizontal Intake Power Vent Termination Clearances Sidewall Power VentDirect Vent Termination Clearances Sidewall Direct VentBELOW. Keep Clear of ALL Obstructions Termination Direct Vent Horizontal TerminationVENT/AIR Termination Locations Clearances Direct Venting Vertical TerminationPrepare ROOF/WALL Penetrations VerticalModel Vent Diameter Vent MIN. Length Vent MAX. Length Inch XP Models AO Smith Condensate Neutralizer KIT Numbers Condensate DisposalCondensate Neutralizer Condensate TrapGAS Pressure Requirements GAS Supply ConnectionsGAS Supply Pipe Connections Check for GAS Leaks Pipe Sizes for Propane GASPurging GAS Line Check GAS Supply Inlet PressureManifold Pressure Connections Filling and Purging of Heating Boiler InstallationFilling HOT Water Supply Boiler Installation Boiler Start UP and OperationsWater Hardness Medium 0-12 Grains PER Gallon XW Model Freeze Protection Hydronic Heating InstallationCHECK/CONTROL Water Hardness INSPECT/FILL Condensate SystemLighting and Operating Instructions Setting of the Test Mode AdjustmentHigh Fire Rate Overview Control SystemBurner Control System Burner Control Operation SpecificationsCommunications and Displays General Operational Sequence Lead LAG LL Master General Operation Lead LAGDomestic HOT Water Definitions FeaturesLocal Operator Interface Display System Mounting the S7999B OI Display and Power Supply Installation Instructions S7999B OI DisplayQuick Setup S7999B OI Display Navigation POWER-UP ValidationCommon OI Display page Symbols Starting UP the S7999B OI DisplayS7999B Display page Flow Status or Home Configure ButtonKeyboard Configuration PasswordLogin Change Parameter SettingsParameter Verify Example of Change ConfigurationHistory Button FAULT/ALARM HandlingData Comment Example of Hydronic History Operation Button Control Expanded Alert DetailSystem Configuration S7999B OI Display only Diagnostics ButtonHydronic Control ConfigurationSystem Synchronization S7999B OI Display only Code Description Recommended Troubleshooting Lockout Codes TroubleshootingReserved ILK OFF Flame Operation Faults 105 Flame detected out of sequence Adjust the LF switch while in this position Inspect the Combustion Pressure Switch to make Code Description Recommended Troubleshooting Lockout Codes Code Description Recommended Troubleshooting Lockout Codes Allowed Code DescriptionFan Parameter Errors Code Description Steam 20mA water temperature setting was invalid Abnormal Recycle Hardware flame bias delta high Eeprom DHW Plate Heat Exchanger Errors Inspect Boiler Area Maintenance ProceduresMaintenance Schedules General MaintenanceAIR Filter BOX Burner MaintenanceBlower Compartment Condensate Removal System Venting MaintenanceHeat Exchanger Maintenance Handling Ceramic Fiber Materials Replacement PartsInlet DIA Piping DiagramsStorage Tank AOS Conditions and Exceptions Limited Warranty

3400, 1700, 2000, 2600 specifications

A.O. Smith, a leader in water heating solutions, has developed a range of high-efficiency water heaters that cater to various residential and commercial needs. Among their stellar offerings are the A.O. Smith 2600, 2000, 1700, and 3400 models, each boasting impressive features, cutting-edge technologies, and excellent energy efficiency.

The A.O. Smith 2600 model is designed for those who require a robust water heating solution with a capacity to handle high-demand scenarios. It utilizes a highly efficient heating element that provides rapid heating and maintains a steady output. The built-in smart control system allows users to monitor temperature settings and track energy consumption, ensuring optimal performance.

Next in line, the A.O. Smith 2000 is perfect for households that require a reliable and efficient water heater without compromising on space. This compact model integrates advanced thermal insulation that minimizes heat loss, coupled with a powerful heating element that ensures quick heating times. Its sleek design makes it suitable for various installations while maintaining aesthetic appeal.

The A.O. Smith 1700 model caters specifically to smaller residential needs but retains features that align with higher-end models. It incorporates state-of-the-art safety features, including overheat protection and a pressure relief valve. Its lightweight structure and ease of installation stand out, making it a recommended choice for those looking for efficient heating without extensive modifications to their plumbing systems.

Lastly, the A.O. Smith 3400 is a powerhouse designed for larger commercial applications. This model offers exceptional heating capacities and includes advanced technologies such as a digital display for easy monitoring and control. The robust build is complemented by a high-performance insulation system that significantly reduces energy consumption and operating costs.

All A.O. Smith water heaters, including the 2600, 2000, 1700, and 3400 models, feature corrosion-resistant materials ensuring longevity and durability. With their commitment to quality and innovation, A.O. Smith continues to provide water heating solutions that meet modern demands while emphasizing energy efficiency and user convenience. Whether for residential or commercial use, each model represents the pinnacle of reliability and performance in water heating technology.

In conclusion, A.O. Smith has established itself as a reliable choice for water heaters, with models that cater to diverse needs without compromising on efficiency or quality.