A.O. Smith HW 610 warranty Models HW 300, 399, 420, 520, 610

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MODELS HW 300, 399, 420, 520, 610, 670

GAS-FIRED COMMERCIAL COPPER BOILERS FOR HYDRONIC HEATING AND HOT WATER SUPPLY

UP-FLOW MODELS

• INSTALLATION • OPERATION • MAINTENANCE • LIMITED WARRANTY

• INDOOR ONLY

WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.

—Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

—WHAT TO DO IF YOU SMELL GAS

•Do not try to light any appliance.

•Do not touch any electrical switch; do not use any phone in your building.

•Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.

•If you cannot reach your gas supplier, call the fire department.

—Installation and service must be performed by a qualified installer, service agency or the gas supplier.

500 Tennessee Waltz Parkway

Ashland City, TN 37015

www.hotwater.com

PLACE THESE INSTRUCTIONS ADJACENT TO BOILER AND

NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE

PRINTED 0210

317693-000

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Contents Tennessee Waltz Parkway Ashland City, TN Models HW 300, 399, 420, 520, 610Important Definitions Safe INSTALLATION, USE and ServiceGeneral Safety Table of Contents Propane Natural Dimensions and Capacity Data27.7 33.3 Recovery CapacitiesIntroduction High Altitude InstallationsLIQUefied petroleum gas models Controls and Function High Limit Switch Safety Flow Switch Manual Reset High LimitThermal Balancer GPM LPMSafety Relief Valves Tank Temperature Control Thermometers GeneralDrain Valve Not Supplied Required AbilityCanadian Installations Confined Space S. InstallationsAIR Requirements Unconfined SpaceTypical Boiler Installation Installation ClearancesVenting LevelingConnecting Boiler to a Common Vent Vent Pipe InstallationDraft Hood Vent ConnectionMultiple Vent Table Venting Sidewall Optional Power Vent SystemVenting System Model HW-300 Boiler Combined Vent Sizing TablesConventional Installations System InstallationsLINEAR-TEMP Installations ONE Boiler Installed Independent of the Primary SystemSchematic of the LINEAR-TEMPSYSTEM NO. Suggested Items for InstallationBoiler Inlet Outlet Sizes Minimum Branch Sizes to BoilersGAS Connections Correct GAS Purging and SizingSpecific Multiplier Gravity ExampleGAS Pressure Regulators Model Rated Manifold Pressure Number Input Natural PropaneWiring Connections WiringD. System HW 300 toSingle Stage I.I.D. Honeywell GAS Valve HW 300 thru 670. Natural and Propane GAS U.S. & CanadaLINEAR-TEMP Installations Boilers and Secondary Circulator are Controlled by Page MODELS, Jucntion BOX W/4 Terminals Canadian MODELS, Junction BOX W/6 TerminalsCanadian MODELS, Junction BOX W/6 Terminals Schematic MODELS, Junction BOX W/4 Terminals MODELS, Junction BOX W/4 Terminals Piping Wiring Figures 16 and 17 on Pages 24Commercial Boiler with Vertical Tank USE this Table for Correct Pump and Water Pipe SizeCommercial Boiler with Horizontal Tank Commercial Boiler with Vertical TANK, CER-TEMP Wiring Figures 21 to 27 on Pages 28 toHW-300 HW-399 HW-420 HW-520 Three HW-520s, HW-610s or HW-670s UP-FLOW Model USE this Table for Correct Pump and Water Pipe Size Filling the System Operation and START-UP InstructionsPilot and Main Burner Main BurnerPilot Burner Electronic Ignition Consumption Rate Checking and Adjusting the InputRefer to Operating at Full Input or Full Capacity Stage Main Burner Operation Flame Current Sensed For Your Safety Read Before Lighting URN Pilo T Firing VA LVE Counterclockwise SET T HE Thermostat to Lowwest SettingManual Reset High Limit Switch Continuity Test General MaintenanceRelief Valve PRE-TROUBLESHOOTING Cleaning and Flushing InstructionsHOT Water Supply Boilers Preventive Maintenance Internal ContaminantsCER-TEMP 80 Recovery System Checkout Procedure TroubleshootingYES Is ceramic insulator surrounding the electrode in good Burner ignition problems?Condition not cracked or broken? Is there excessive draft conditions that may cause pilotMV & MV/PV? Replace pilot burner assembly Location of LEDs Flame LED Yellow LED Status and TroubleshootingStatus LED Green OFFNo Call for Heat Not applicable None OFF Conditions and Exceptions Limited Warranty